research question for biology ia

IB Biology IA: 60 Examples and Guidance

Charles Whitehouse

The International Baccalaureate (IB) program offers a variety of assessments for students, including Internal Assessments (IAs), which are pieces of coursework marked by students’ teachers. The Biology IA is an assessment designed to test students' understanding of the material they have learned in their biology course and their ability to conduct independent research.

What is the IA?

The IA consists of a laboratory report that students must complete during their IB biology course. For assessments before May 2025, the report should be 6 to 12 pages in length and should include a research question, a methodology section, data analysis, and a conclusion. From May 2025 , the report should be a maximum of 3,000 words.

What should the IA contain?

The research question for the internal assessment should be a testable question that is related to the biology curriculum. It's essential that the question is relevant to the biology curriculum, specific and clearly defined. The methodology section should explain how the research was conducted, including the materials and methods used. The methodology should be detailed and well-explained, and should include information on the materials and methods used, as well as any ethical considerations.

Data analysis is an important aspect of the IA. Students should present their data in a clear and organized manner, and should use appropriate statistical analysis to interpret their results. They should also make sure to include a discussion of the limitations of their study and the implications of their findings.

The conclusion should summarise the main findings of the study and should relate the results back to the research question. It should also include recommendations for further research.

In addition to the laboratory report, students must also complete a reflective statement. Online tutors recommend that this statement should be around 500 words long, and should reflect on the student’s learning during the internal assessment process. The reflective statement should include a description of the student’s personal learning process, including successes and challenges, as well as an evaluation of their performance on the internal assessment and the skills they have gained through the process.

Have a look at our comprehensive set resources for IB Biology developed by expert IB teachers and examiners!

- IB Biology 2024 Study Notes

- IB Biology 2025 Study Notes

- IB Biology 2024 Questions

- IB Biology 2025 Questions

What are some example research questions?

Here are examples with details of potential research questions, written by expert IB Biology tutors and teachers, that could inspire your Biology IA:

1 - Investigating the effect of different types of sugars on the rate of fermentation by yeast. To investigate the effect of different concentrations of a specific herbicide on the growth rate of a particular plant species, one could set up an experiment in which the plants are grown in soil with varying concentrations of the herbicide. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the herbicide on the plant's growth.

2 - How does the pH of a solution affect the activity of an enzyme? To investigate the effect of pH on enzyme activity, one could set up an experiment in which the enzyme is exposed to solutions with varying pH levels. The enzyme's activity could be measured by monitoring the rate of a specific reaction catalyzed by the enzyme. Control variables such as temperature, substrate concentration, and enzyme concentration would need to be kept constant. By comparing the activity of the enzyme at different pH levels, the optimal pH range for the enzyme could be determined.

3 - Can the concentration of vitamin C in different types of fruit juice be determined using titration?

To determine the concentration of vitamin C in different types of fruit juice using titration, a standardized solution of a known concentration of potassium permanganate would be prepared. A sample of the fruit juice would be titrated with the potassium permanganate solution until the endpoint is reached, indicating that all the vitamin C has reacted with the potassium permanganate. The concentration of vitamin C in the fruit juice can then be calculated based on the volume and concentration of the potassium permanganate solution used in the titration. This process would need to be repeated for each type of fruit juice being tested.

4 - Investigating the effect of light intensity on the rate of photosynthesis in aquatic plants.

Set up an experiment in which aquatic plants are placed in containers with varying levels of light intensity. The light intensity could be controlled by adjusting the distance between the light source and the plants. The rate of photosynthesis could be measured by tracking the amount of oxygen produced by the plants over a set period of time. Comparing the rates of photosynthesis of the different groups would determine the impact of light intensity on the plant's photosynthetic activity. Control variables such as temperature, water quality, and plant species would need to be kept constant.

5 - How does the concentration of carbon dioxide affect the rate of photosynthesis in terrestrial plants?

Conduct an experiment in which plants are grown under different concentrations of carbon dioxide. The plants would need to be grown in a controlled environment with consistent light, temperature, and watering. The rate of photosynthesis could be measured by monitoring the oxygen production of the plants using a dissolved oxygen probe. The results could then be analyzed to determine how the concentration of carbon dioxide affects the rate of photosynthesis in terrestrial plants.

6 - Can the presence of glucose in urine be determined using Benedict's test?

Collect a urine sample from the individual being tested. Add Benedict's reagent to the sample and heat it in a water bath. If glucose is present in the urine, it will react with the Benedict's reagent and cause a color change. The intensity of the color change can be compared to a color chart to determine the concentration of glucose in the urine. This process would need to be repeated for each urine sample being tested.

7 - Investigating the effect of temperature on the respiration rate of germinating seeds.

Set up an experiment in which germinating seeds are exposed to different temperatures. The respiration rate of the seeds could be measured by monitoring the amount of oxygen consumed or carbon dioxide produced over a set period of time. The experiment would need to control for other variables such as the type of seed, the amount of water and nutrients provided, and the length of time the seeds have been germinating. Comparing the respiration rates of the different groups would determine the effect of temperature on the seeds' respiration rate.

8 - How does the concentration of salt in a solution affect the growth of bacteria?

Prepare a series of solutions with varying concentrations of salt, and inoculate each with a known amount of bacteria. The solutions would need to be incubated at a constant temperature for a set period of time, and the growth of the bacteria could be measured by counting the number of colonies or by using a spectrophotometer to measure the optical density of the solution. Comparing the growth rates of the bacteria in the different salt concentrations would determine the effect of salt on bacterial growth. Control variables such as pH, temperature, and nutrient availability would need to be kept constant.

9 - Can the concentration of nitrogen compounds in soil be determined using colorimetry?

Collect soil samples from different locations and extract the nitrogen compounds using a suitable method such as Kjeldahl digestion. The extracted compounds can then be analyzed using colorimetry, which involves adding a reagent that reacts with the nitrogen compounds and produces a color. The intensity of the color can be measured using a spectrophotometer, and the concentration of nitrogen compounds in the soil can be calculated based on the absorbance of the color. This process would need to be repeated for each soil sample being tested.

10 - Investigating the effect of different types of plant hormones on the growth of seedlings.

Set up an experiment in which seedlings are grown in different concentrations of plant hormones, with control variables such as light, temperature, and watering. The growth rate of the seedlings could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the plant hormones on the seedlings' growth. The experiment could also include observations of other plant characteristics such as leaf size and color, root development, and overall health.

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11 - How does the concentration of salt in water affect the hatching rate of brine shrimp?

Set up multiple containers with different concentrations of salt water and add brine shrimp eggs to each container. The containers should be kept at a consistent temperature and light level. After a set period of time, count the number of hatched brine shrimp in each container and calculate the hatching rate. Comparing the hatching rates of the different containers would determine the effect of salt concentration on the hatching rate of brine shrimp.

12 - Can the rate of mitosis be determined using microscopy techniques?

Collect a sample of cells undergoing mitosis and prepare them for microscopy. Using a microscope, observe the cells and record the time it takes for each cell to complete each stage of mitosis. The rate of mitosis can then be calculated by dividing the time taken for each stage by the total time taken for the entire process. This process would need to be repeated for multiple cells to ensure accuracy and reliability of the results.

13 - Investigating the effect of different types of antibiotics on the growth of bacteria.

Culture bacteria in petri dishes with different concentrations of antibiotics. The growth of the bacteria can be observed and measured over a set period of time. The concentration of antibiotic that inhibits the growth of the bacteria can be determined, and the effectiveness of different types of antibiotics can be compared. Control variables such as temperature, humidity, and nutrient availability would need to be kept constant to ensure accurate results.

14 - How does the concentration of oxygen affect the respiration rate of crickets?

Set up a series of chambers with different concentrations of oxygen, ranging from low to high. Place crickets in each chamber and monitor their respiration rate by measuring the amount of oxygen consumed and carbon dioxide produced over a set period of time. The results can be analyzed to determine the effect of oxygen concentration on the respiration rate of crickets. Control variables such as temperature and humidity would need to be kept constant throughout the experiment.

15 - Can the concentration of glucose in blood be determined using glucose oxidase and spectrophotometry?

A sample of blood would be mixed with glucose oxidase, which converts glucose to hydrogen peroxide. The amount of hydrogen peroxide produced is proportional to the amount of glucose in the sample. A spectrophotometer would then be used to measure the absorbance of the sample at a specific wavelength, which is also proportional to the amount of hydrogen peroxide present. The concentration of glucose in the blood sample can then be calculated based on the absorbance reading and a standard curve generated using known concentrations of glucose. This process would need to be repeated for each blood sample being tested.

16 - Investigating the effect of different types of pesticides on the growth of bean plants.

Set up an experiment in which bean plants are grown in soil treated with varying concentrations of different pesticides. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the pesticides on the plant's growth. Additionally, the health of the plants could be assessed by examining their leaves for signs of damage or discoloration.

17 - How does the concentration of light affect the growth of algae?

Set up multiple containers with different concentrations of light, ranging from low to high. In each container, add a sample of algae and monitor their growth over a set period of time. The growth rate of the algae can be measured by tracking their biomass or chlorophyll content. Comparing the growth rates of the different groups would determine the impact of light concentration on the growth of algae. Control variables such as temperature, nutrient availability, and water quality would need to be maintained to ensure accurate results.

18 - Can the presence of starch in leaves be determined using iodine solution?

Obtain a sample of the leaf and grind it into a fine powder. Add a few drops of iodine solution to the powder and observe the color change. If the solution turns blue-black, it indicates the presence of starch in the leaf. This process would need to be repeated for multiple leaves from different plants to ensure accuracy and reliability of the results. Control variables such as the age of the leaf and the time of day the sample is taken should also be considered.

19 - Investigating the effect of different types of plant nutrients on the growth of tomatoes.

Set up an experiment in which tomato plants are grown in soil with varying concentrations of different plant nutrients, such as nitrogen, phosphorus, and potassium. Control variables such as light, temperature, and watering would need to be maintained. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the plant nutrients on the plant's growth. Additionally, the nutrient content of the tomato plants could be analyzed to determine if there is a correlation between the nutrient concentration in the soil and the nutrient content in the plant.

20 - How does the concentration of carbon dioxide affect the growth of marine plants?

Conduct an experiment in which marine plants are grown in water with varying concentrations of carbon dioxide. The carbon dioxide concentration could be controlled by bubbling different amounts of carbon dioxide gas into the water. The growth rate of the plants could be measured by tracking their height, mass, or chlorophyll content over a set period of time. Comparing the growth rates of the different groups would determine the impact of carbon dioxide concentration on the plant's growth. Other variables such as light, temperature, and nutrient availability would need to be controlled to ensure that any differences in growth rate are due to the carbon dioxide concentration.

21 - Can the concentration of protein in an egg be determined using the Biuret method?

To determine the concentration of protein in an egg using the Biuret method, the egg would need to be homogenized and the protein extracted. A Biuret reagent would then be added to the protein extract, which would cause a color change if protein is present. The intensity of the color change would be proportional to the concentration of protein in the egg. A standard curve could be created using known concentrations of protein to determine the concentration of protein in the egg sample. This process would need to be repeated for each egg being tested.

22 - Investigating the effect of different types of plant hormones on the root growth of seedlings.

Set up an experiment in which seedlings are grown in soil with different concentrations of plant hormones. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The root growth of the seedlings could be measured by tracking their length or mass over a set period of time. Comparing the root growth of the different groups would determine the impact of the plant hormones on the seedling's root growth.

23 - How does the concentration of oxygen affect the respiration rate of goldfish?

Set up multiple tanks with goldfish and varying levels of oxygen concentration. The respiration rate of the goldfish can be measured by tracking their oxygen consumption or carbon dioxide production. The experiment would need to be conducted over a set period of time with control variables such as temperature and feeding schedules. Comparing the respiration rates of the different groups would determine the effect of oxygen concentration on the goldfish's respiration rate.

24 - Can the concentration of a specific hormone in blood be determined using ELISA?

ELISA (enzyme-linked immunosorbent assay) involves coating a microplate with a specific antibody that binds to the hormone of interest. The sample of blood is then added to the plate, and any hormone present in the sample will bind to the antibody. A secondary antibody that is linked to an enzyme is then added, which will bind to the hormone-antibody complex. The enzyme will then catalyze a reaction that produces a detectable signal, such as a color change. The intensity of the signal is proportional to the amount of hormone present in the sample, allowing for the concentration of the hormone to be determined. A standard curve can be created using known concentrations of the hormone to accurately quantify the concentration in the sample.

25 - Investigating the effect of different types of pollutants on the growth of watercress.

Set up an experiment in which watercress plants are grown in water contaminated with different types and concentrations of pollutants. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the pollutants on the plant's growth. Control variables such as light, temperature, and watering would need to be kept constant to ensure accurate results. The types and concentrations of pollutants used in the experiment would need to be carefully chosen based on their potential impact on watercress growth and their relevance to real-world pollution scenarios.

26 - How does the concentration of light affect the rate of respiration in germinating seeds?

Set up a series of experiments in which germinating seeds are exposed to different intensities of light. The rate of respiration could be measured by tracking the amount of oxygen consumed or carbon dioxide produced by the seeds over a set period of time. The experiment would need to control for other variables such as temperature and humidity. Comparing the rates of respiration for the different light intensities would determine the impact of light concentration on the rate of respiration in germinating seeds.

27 - Can the concentration of nitrates in water be determined using colorimetry?

Prepare a series of standard solutions of known concentrations of nitrates. A sample of the water would be mixed with a reagent that reacts with nitrates to produce a colored product. The intensity of the color would be measured using a colorimeter, and the concentration of nitrates in the water can be calculated based on the intensity of the color and the concentration of the standard solutions. This process would need to be repeated for each water sample being tested.

28 - Investigating the effect of different types of disinfectants on the growth of bacteria.

Prepare a culture of bacteria and divide it into multiple groups. Each group would be exposed to a different type of disinfectant, while control groups would not be exposed to any disinfectant. The growth rate of the bacteria in each group would be measured over a set period of time, either by counting the number of colonies or by measuring the turbidity of the culture. Comparing the growth rates of the different groups would determine the effectiveness of each disinfectant on inhibiting bacterial growth.

29 - How does the concentration of salt in water affect the growth of duckweed?

Set up multiple containers of water with varying concentrations of salt. Add duckweed to each container and monitor their growth over a set period of time. The growth rate of the duckweed can be measured by tracking their surface area or biomass. Comparing the growth rates of the different groups would determine the impact of salt concentration on the growth of duckweed. Control variables such as light, temperature, and nutrients should be kept constant across all containers.

30 - Can the concentration of ethanol in different types of alcoholic beverages be determined using gas chromatography?

Use gas chromatography to separate the components of the alcoholic beverage sample. The ethanol would be detected and quantified using a detector such as a flame ionization detector. The concentration of ethanol in each sample can then be calculated based on the peak area or height of the ethanol peak in the chromatogram. This process would need to be repeated for each type of alcoholic beverage being tested.

31 - Investigating the effects of different types of exercise on heart rate and blood pressure.

Recruit a group of participants and randomly assign them to different exercise groups (e.g. running, cycling, weightlifting). Measure their heart rate and blood pressure before and after the exercise session. Repeat this process for each exercise group. Analyze the data to determine if there are any significant differences in the effects of the different types of exercise on heart rate and blood pressure. Control variables such as age, gender, and fitness level should be taken into account.

32 - How does the level of noise pollution affect the behavior and communication of animals?

Conduct a field study in which the behavior and communication of animals in areas with varying levels of noise pollution are observed and recorded. Control variables such as time of day, weather conditions, and animal species would need to be taken into account. The observations could include changes in vocalizations, movement patterns, and social interactions. Comparing the behavior and communication of animals in areas with different levels of noise pollution would determine the impact of noise on their behavior. Statistical analysis could be used to establish correlations between noise levels and changes in animal behavior.

33 - Investigating the effects of different types of fertilizers on plant growth and nutrient uptake.

Set up an experiment in which identical plants are grown in soil with different types of fertilizers. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Nutrient uptake could be measured by analyzing the nutrient content of the plants at the end of the experiment. Comparing the growth rates and nutrient uptake of the different groups would determine the impact of the fertilizers on plant growth and nutrient uptake. Control variables such as light, temperature, and watering would need to be kept constant.

34 - How does exposure to light pollution affect the migration and behavior of nocturnal animals?

Conduct a field study in which nocturnal animals are observed in areas with varying levels of light pollution. The behavior and migration patterns of the animals could be tracked using GPS or radio telemetry. Data on the animals' activity levels, movement patterns, and habitat use could be collected and compared between areas with different levels of light pollution. This would allow for an assessment of the impact of light pollution on nocturnal animals and their ecosystems.

35 - Investigating the effects of different types of water pollution on aquatic ecosystems and organisms.

Set up multiple tanks or containers with different types and levels of water pollution, such as oil spills, chemical runoff, or excess nutrients. Populate each tank with a variety of aquatic organisms, such as fish, algae, and invertebrates. Monitor the health and behavior of the organisms over a set period of time, noting any changes in growth, reproduction, or mortality rates. Comparing the results from each tank would allow for an assessment of the impact of different types of water pollution on aquatic ecosystems and organisms.

36 - How does exposure to electromagnetic radiation affect the growth and development of plants?

Set up an experiment in which plants are exposed to different levels of electromagnetic radiation, such as UV light or radio waves. The plants would need to be grown in a controlled environment with consistent light, temperature, and watering. The growth rate and development of the plants could be measured by tracking their height, leaf size, and overall health over a set period of time. Comparing the growth and development of the plants exposed to different levels of electromagnetic radiation would determine the impact of the radiation on the plants. Control groups of plants not exposed to radiation would also need to be included for comparison.

37 - Investigating the effects of different types of air pollution on respiratory function and lung health.

Recruit a sample of participants who are exposed to different types of air pollution, such as those who live near busy roads or industrial areas. Conduct lung function tests, such as spirometry, on each participant to establish a baseline measurement of their respiratory health. Repeat the tests after a set period of time to determine any changes in lung function. Comparing the results of participants exposed to different types of air pollution would determine the impact of each type on respiratory function and lung health. Other factors, such as age and smoking status, would need to be controlled for in the analysis.

38 - How does the level of acidity affect the growth and survival of aquatic organisms?

Conduct experiments in which aquatic organisms are exposed to different levels of acidity. The organisms could be placed in tanks with varying pH levels, and their survival and growth rates could be monitored over time. Control variables such as temperature, light, and food availability would need to be kept constant. Comparing the survival and growth rates of the different groups would determine the impact of acidity on the organisms. Additionally, other factors such as changes in behavior or reproduction could also be observed and analyzed.

39 - Investigating the effects of different types of food additives on human health and metabolism.

Conduct a literature review to identify the potential health effects of different food additives. Design a study in which participants consume a controlled diet with varying levels of the food additives being tested. Blood and urine samples could be collected at regular intervals to measure changes in metabolism and biomarkers of health. Statistical analysis would be used to determine if there are significant differences in health outcomes between the different groups.

40 - How does the level of UV radiation affect the growth and survival of plants?

Set up an experiment in which plants are grown under different levels of UV radiation. This could be achieved by using UV lamps of varying intensities or by placing the plants at different distances from a natural source of UV radiation, such as the sun. The growth rate, survival rate, and other relevant factors such as leaf size and chlorophyll content could be measured and compared across the different groups. This would help determine the impact of UV radiation on plant growth and survival. Control variables such as temperature, humidity, and watering would need to be carefully monitored and controlled to ensure accurate results.

41 - Investigating the effects of different types of drugs on human physiology and behavior.

Conduct a double-blind, randomized controlled trial with a group of participants who are given different types of drugs. The physiological and behavioral effects of the drugs would be measured through various tests and assessments, such as blood pressure, heart rate, cognitive function, and mood. The results would be analyzed to determine the impact of each drug on the participants' physiology and behavior, and any potential side effects or risks associated with each drug would be identified.

42 - How does the level of carbon dioxide affect the growth and development of plants?

Conduct an experiment in which plants are grown in controlled environments with varying levels of carbon dioxide. The growth rate, height, and biomass of the plants can be measured over a set period of time. The results can be compared to determine the impact of different levels of carbon dioxide on plant growth and development. Other variables such as light, temperature, and watering would need to be controlled to ensure that the results are accurate and reliable.

43 - Investigating the effects of different types of pesticides on non-target organisms and ecosystems.

Conduct a series of experiments in which different non-target organisms are exposed to varying concentrations of the pesticide. The organisms could be chosen based on their ecological importance, such as pollinators or soil microorganisms. The effects of the pesticide on the organisms could be measured by tracking their survival rates, reproductive success, or behavior. Additionally, the impact of the pesticide on the broader ecosystem could be assessed by monitoring changes in the abundance and diversity of other species in the area. Comparing the results of these experiments would provide insight into the potential ecological risks associated with the use of the pesticide.

44 - How does the level of atmospheric pollutants affect the growth and development of plants?

Set up an experiment in which plants are grown in controlled environments with varying levels of atmospheric pollutants, such as nitrogen dioxide or ozone. The growth rate, leaf area, and chlorophyll content of the plants could be measured over a set period of time. Comparing the growth rates and health of the plants exposed to different levels of pollutants would determine the impact of atmospheric pollutants on plant growth and development. Control variables such as light, temperature, and watering would need to be kept constant to ensure accurate results.

45 - Investigating the effects of different types of microorganisms on the digestive system and gut microbiome.

Conduct a study in which different groups of animals are exposed to different types of microorganisms, either through their diet or through direct exposure. The effects on their digestive system and gut microbiome could be measured through various methods such as analyzing fecal samples, measuring changes in gut pH, or monitoring the presence of certain bacteria. Comparing the results from the different groups would determine the impact of the microorganisms on the animals' digestive system and gut microbiome.

46 - How does the level of humidity affect the growth and survival of insects?

Conduct an experiment in which insects are exposed to different levels of humidity in a controlled environment. The survival rate and growth rate of the insects could be measured over a set period of time. The experiment would need to control for other variables such as temperature, food availability, and lighting. Comparing the survival and growth rates of the insects in different humidity levels would determine the impact of humidity on their growth and survival.

47 - Investigating the effects of different types of radiation on the genetic material and DNA replication.

Cultivate a sample of cells in a controlled environment and expose them to different types of radiation, such as gamma rays or UV light. The cells would then be monitored for changes in their genetic material, such as mutations or damage to DNA replication. The results could be compared to a control group that was not exposed to radiation to determine the effects of each type of radiation on the cells. Additional experiments could be conducted to investigate the long-term effects of radiation exposure on the cells.

48 - How does the level of soil salinity affect the growth and survival of plants?

Set up an experiment in which plants are grown in soil with varying levels of salinity. An appropriate range of salinity levels and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate and survival rate of the plants could be measured by tracking their height, mass, and number of leaves over a set period of time. Comparing the growth and survival rates of the different groups would determine the impact of soil salinity on the plant's growth and survival. Additionally, the concentration of ions in the soil could be measured to determine the relationship between soil salinity and plant growth.

49 - Investigating the effects of different types of antibiotics on bacterial growth and antibiotic resistance.

Set up a series of petri dishes with agar and bacterial cultures. Each dish would contain a different antibiotic, with varying concentrations. The dishes would be incubated for a set period of time, and the growth of the bacteria would be measured. The results would show which antibiotics were most effective at inhibiting bacterial growth, and whether any resistance had developed. Control variables such as temperature, humidity, and the type of bacteria used would need to be carefully controlled to ensure accurate results.

50 - How does the level of soil pH affect the growth and survival of plants?

Conduct an experiment in which plants are grown in soil with varying pH levels. An appropriate range of pH levels and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of soil pH on the plant's growth and survival. Other factors such as nutrient availability and toxicity would also need to be considered and controlled for in the experiment.

51 - Investigating the effects of different types of hormones on animal behavior and physiology.

Conduct experiments with different groups of animals, each exposed to a different hormone. The behavior and physiology of the animals would be monitored and recorded over a set period of time. Control variables such as diet, environment, and age would need to be maintained across all groups. Comparing the results of the different groups would determine the effects of each hormone on the animals' behavior and physiology. Statistical analysis could be used to determine the significance of the results.

52 - How does the level of water availability affect the growth and survival of plants?

Conduct an experiment in which plants are grown in different levels of water availability, ranging from drought conditions to optimal watering. The growth rate, survival rate, and overall health of the plants would be monitored over a set period of time. The data collected would be used to determine the impact of water availability on plant growth and survival. Control variables such as light, temperature, and soil type would need to be kept constant to ensure accurate results.

53 - Investigating the effects of different types of plant extracts on bacterial growth and antibiotic resistance.

Prepare bacterial cultures in petri dishes with different concentrations of the plant extracts. The growth of the bacteria can be observed over a set period of time, and the effectiveness of the plant extracts in inhibiting bacterial growth and antibiotic resistance can be determined by comparing the growth rates of the different groups. Control variables such as temperature and nutrient availability would need to be kept constant to ensure accurate results.

54 - How does the level of nutrients affect the growth and development of microorganisms?

Conduct experiments in which microorganisms are grown in nutrient-rich and nutrient-poor environments. The growth rate and development of the microorganisms could be measured by tracking their population size and observing their morphology under a microscope. Comparing the growth rates and morphology of the microorganisms in the different environments would determine the impact of nutrient levels on their growth and development. Control variables such as temperature, pH, and oxygen levels would need to be kept constant.

55 - Investigating the effects of different types of pollution on the reproductive systems and fertility of animals.

Select a suitable animal species and expose them to different types of pollution, such as air pollution or water pollution. The reproductive systems and fertility of the animals could be monitored over a set period of time, and compared to a control group that was not exposed to pollution. The impact of the pollution on the animals' reproductive systems and fertility could be determined by analyzing factors such as the number of offspring produced, the health of the offspring, and any abnormalities or complications observed during pregnancy or birth.

56 - How does the level of light intensity affect the growth and development of microorganisms?

Set up multiple petri dishes with agar and different levels of light intensity, ranging from complete darkness to bright light. Inoculate each dish with the same strain of microorganisms and incubate them for a set period of time. The growth of the microorganisms can be measured by counting the number of colonies or by measuring the turbidity of the culture. Comparing the growth rates of the different groups would determine the impact of light intensity on the growth and development of the microorganisms. Control variables such as temperature, nutrient availability, and humidity would need to be maintained throughout the experiment.

57 - Investigating the effects of different types of food on the metabolism and energy balance of humans.

Conduct a randomized controlled trial in which participants are assigned to different groups and given different types of food to eat for a set period of time. The participants' energy intake, metabolism, and weight would be measured before and after the intervention to determine the impact of the different types of food on their energy balance. Other factors such as physical activity levels and sleep patterns would also need to be controlled for to ensure accurate results.

58 - How does the level of nutrients affect the growth and development of plants?

Conduct an experiment in which plants are grown in different nutrient solutions with varying levels of nitrogen, phosphorus, and potassium. The growth rate, height, and mass of the plants could be measured over a set period of time to determine the impact of the nutrient levels on their growth and development. Control variables such as light, temperature, and watering would need to be kept constant. The results could be analyzed to determine the optimal nutrient levels for plant growth and development.

59 - Investigating the effects of different types of hormones on plant growth and development.

Set up an experiment in which different groups of plants are treated with different types and concentrations of hormones. The growth rate, height, and mass of the plants could be measured over a set period of time. Control variables such as light, temperature, and watering would need to be kept constant. Comparing the growth rates of the different groups would determine the impact of the hormones on the plant's growth and development. Additional measurements such as leaf size, root length, and flower production could also be taken to further analyze the effects of the hormones.

60 - How does the level of water quality affect the growth and survival of aquatic organisms?

Set up multiple aquariums with varying levels of water quality, such as different levels of pollutants or pH. Introduce the same species of aquatic organism into each aquarium and monitor their growth and survival over a set period of time. The growth rate and survival rate of the organisms can be compared between the different aquariums to determine the impact of water quality on their growth and survival. Control variables such as temperature and feeding schedules should be kept consistent across all aquariums.

Remember to come up with your own original IA topic and check it with your teacher. It should be practical to conduct and relevant to the syllabus. Even A-Level Biology tutors say that this is a great opportunity to develop your personal interests, while advancing your knowledge of the Biology curriculum.

How can I prepare for the IA?

To prepare for the IA, students should ensure that they understand the material covered in their biology course and should practice writing lab reports. They should also seek feedback from their teachers on their writing skills and their understanding of the research process. IB tutors provide personalized guidance and can help students understand complex topics and achieve higher grades as well.

TutorChase's IB resources are perfect for students who want to get a 7 in their IB Biology exams and also prepare for the internal assessment. They are completely free, cover all topics in depth, also have IB Biology past papers and are structured by topic so you can easily keep track of your progress.

How is the IA graded?

The IA is worth 20% of the final grade for the IB biology course, whether you are studying at Higher or at Standard Level. It is graded by the student’s teacher, who is trained and certified by the International Baccalaureate organization. The report is then sent to a moderator, who will check that the report adheres to the IB guidelines and that the grade awarded is appropriate.

Online Biology tutors emphasise that it is important for students to be familiar with the assessment criteria for the biology internal assessment. These criteria are used to grade the laboratory report and reflective statement, and include aspects such as the quality of the research question, the methodology used, the data analysis, and the conclusion. Students should also make sure that their report is well-written and properly formatted, and that it includes all the required sections.

Source: IB Biology Subject Guide, pre-May 2025

In summary, the IA in the IB is an opportunity for students to demonstrate their understanding of the biology curriculum, as well as their ability to conduct independent research. It consists of a laboratory report and a reflective statement, and is worth 20% of the final grade for the course. To prepare for the assessment, students should ensure that they understand the material covered in their IB Biology.

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Charles scored 45/45 on the International Baccalaureate and has six years' experience tutoring IB and IGCSE students and advising them with their university applications. He studied a double integrated Masters at Magdalen College Oxford and has worked as a research scientist and strategy consultant.

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IB Biology IA ideas (30+ topics) - A Goldmine You Can't Ignore.

Unleash your potential in IB Biology with our exclusive list of 30+ captivating IA ideas! Discover the secrets to scoring top marks & nail your IA now!

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Sitting in that quiet corner, sipping hot chocolate, hoping it rains IB Biology IA ideas, instead, going blank and utterly confused?

We don't want that to happen, do we?

Choosing the perfect IB Biology IA idea is only the first step in making one's IB Biology Investigation, but definitely, the most significant. IB Biology IA Ideas won't strike out of the blue, but here's a list of 30+ IB Biology IA ideas to inspire and stimulate your grey cells! Selecting an IBxq Biology IA idea has always been challenging!

Before we look for IB Biology IA ideas, let's clearly comprehend the IB Biology Diploma Programme Subject , its objectives, partwise breakdown, and what IB expects of you.

The IB IAs are essential to one's overall subject performance since they make up 20% of the final score. Internal Assessments are the perfect way to get students to put their knowledge to use by Observing, Questioning, and Investigating. Personal engagement , Exploration , Analysis , Evaluation , and Communication are the criteria against which the investigation is assessed.

The sure-shot way to ace one's IB Biology IA, or any IA, is by picking a topic that sparks one's interest. A well-planned , structured, and executed IA has been undertaken with zeal and enthusiasm. It is all the same when choosing that one Biology IA idea from a platter full of inspiration.

Before we dive more in-depth, you should check out our premium IB Biology SL Notes to own your Biology SL papers! Along with a bundle of Past Papers , these premium SL notes include guides for your Extended Essay and Internal Assessments with helpful examples! You certainly want to take advantage of these! Browse these for more information!

When it comes to selecting from several IB Biology IA ideas for your investigation, it is essential to note that your IA would either require you to:

Carry out experimental research in the laboratory or
Draw interpretation from a credible database or
Make a detailed analysis using a simulation/modelling.

Either way, you must connect to your topic and portray personal engagement as it lays the foundation for the rest of your investigation. Proper research is a bare minimum, and the rest follows. Here's a quick summary of how you are supposed to choose an appropriate IB Biology IA idea for your report:

Know your interest: Go through several IA ideas to understand what all topics are in sync with the IB Biology curriculum and if something grabs your attention, hold on to it!
Keep it specific: The idea should be more generic and more complex. An ideal IA idea reeks of originality and leaves room for proper investigation and analysis.
Let it be realistic: Outline the Equipment, time, and resources to check its feasibility.

Tada! There you go!

Now that you know how to settle on that one perfect topic, let's quickly brief ourselves on the proper planning and procedure involved in the making of an IB Biology IA:

Concise Research Question:

Your Research Question and the Aim of the Investigation are separate sub-headings with different implications. Keep the research question brief and relevant. The Aim answers Why while the Research Question answers the What.

It is essential to set the Research Question in the background of the chosen topic. My Background, IB expects you to briefly explain what encouraged you to select a particular topic and, hopefully, a personal story that validates your choice and engagement. For instance, if you choose to investigate how light levels affect the predation of peppered moths, you could set a background that you have gained a fascination for that species ever since it was introduced to you for some explanation in your regular classes and eventually give more scientific basis for your choice.
Independent, Dependent variables need to be highlighted, as should the hypothesis. State your hypothesis; it is important in the context of your research. Constraints, if any, need to be mentioned as well. Remember, the Independent variable is one that you are allowed to change(just one); the Dependent variable is one that you measure as it changes with the Independent variable; all the other experiment conditions must be kept constant to ensure that the experiment is fair.
The procedure used should be well structured.
Tables, Graphs, etc., should be used.
Perform the relevant analysis, consider the research question, and conclude.
Limitations and Improvements should be specified.

Acknowledging the safety protocols established by IB and considering the ethical aspects of your investigation is imperative.

Focus on the question:

"If there are any ethical implications to your report, how do you plan on minimizing the environmental impact of your experiment?"

Citing documents/web pages and giving references is another crucial aspect of your IA that needs to be taken care of.

An important thing to note here is that although you are allowed to take inspiration from existing research, papers/journals, you are expected to give a novel perspective to the idea while producing it in your investigation.

For example, an idea inspired by how the soil pH affects seed germination could be investigated in a new light; think of other factors controlling/affecting seed germination. You could progress further in your report with a focus on quantitative data.

With all the necessary information at your disposal, it is time to present some fantastic IB Biology IA ideas to encourage you to put your thinking caps on and take on the challenge with newfound zeal! These ideas are meant to give you a little head start along this path; your final IB Biology Investigation idea is your interpretation of one.

Without further adieu, let's dive headfirst into 30+ IB Biology IA ideas for your Biology IA Investigation!

Reference to Course: Molecular Biology (Metabolism, Cell Respiration, Photosynthesis)
Lab, Simulation-based
Reference to Course: Molecular Biology (Metabolism, Cell Respiration, Photosynthesis)
Experimental
Reference to Course: Cell Biology (Membrane Structure)
Experimental
Reference to Course: Plant Biology
Reference to Course: Molecular Biology (Enzymes)
Reference to Course: Cell Biology
Simulation/Modelling
Reference to Course: Cell Biology (Osmosis)
Database based
Reference to Course: Molecular Biology (Enzymes)
Reference to Course: Ecology
Reference to Course: Microbiology
Reference to Course: Molecular Biology(Enzymes)
Experimental, Simulation-based
Reference to Course: Buffers
Reference to Course: Human Physiology
Reference to Course: Molecular Biology(Enzymes)
Simulation Analysis
Database, Experimental
Reference to Course: Plants Physiology

These ideas are for you to start exploring and begin! Take inspiration from these and research further to land on that one idea that gets you going!

But is that it? Certainly not!

Here are a couple of other ideas you could browse and eventually take inspiration from:

Effect of Different Fertilizers on Eutrophication .
Analyzing Milk Spoilage under varying conditions of Temperature, Sunlight, etc.
Exploring how a particular variable affects the germination of seeds .
Investigating the rate of oxygen production of seaweed with variation in light intensity.
To prevent microbial growth, explore better ways to clean household items(for example - mats).
Studying the effect of temperature on photosynthesis in Green Gram(Vigna Radiata).
Understanding what effect different ethanol concentrations have on cell membranes.
Studying the biology behind Schizophrenia .
Investigating the decay time of different Genetically Modified Foods .
Understanding the impact of different variables on vegetable decay/ Exploring other methods to prevent vegetable decay.

And that's that!

These little ideas will help you brainstorm and explore further the vast yet intriguing expanse of biology. IB Biology curriculum expects you to appreciate scientific problems in a global context with stimulating opportunities, and IB Biology IAs help you accomplish just that. It might seem like a lot of work, but with the right topic, you will surpass your expectations! On this note, we wish you all the very best for your IB Biology IA Journey :)

Want some A-quality guidance? Look no further; at Nail IB, we have assembled premium content for you to ace your IBs, and you should check out our resources for a smooth IB experience. Click here for top-notch IB resources or to assess how your prep is going!

This article will be a foundation for you to get going on that IB Biology IA Investigation of yours!

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55234 + free ib flashcards, 157 + free ia samples, 3965 + ib videos by experts, 20099 + ib sample practice questions, ib resources for 30 + subjects.

IB Biology IA examples

Type a search phrase to find the most relevant Biology IA examples for you

Not sure what to search for? You can always look through our example Internal Assessments below for inspiration.

All Biology IA Examples

Filter exemplars.

Starting from the May 2025 session, the Biology IA requirements have changed. We created a couple of exemplars to show you how the new IA should look like. It's OK to refer to the old Biology IA exemplars (since the new IA is quite similar) for inspiration/ideas, but make sure to follow the new requirements.

What is the effect of increasing iron (III) chloride concentration (0 mg/L, 2mg/L, 4mg/L, 6mg/L, 8mg/L, 10mg/L) on the growth of duckweed (Lemna minor) in terms of change in number of leaves over 5 days?

How do altering salicylic acid concentrations (0.0%, 0.5%, 1.0%, 1.5%, 2.0%) affect the germination of capsicum annuum longum seeds measuring the radicle length (mm) of the sprouts over 7 days, want to get full marks for your ia allow us to review it for you 🎯, how does the concentration of 50ml of ethanol solution (15%, 30%, 45%, 60%, 75%) influence the cell membrane permeability of beetroot, measured by the absorption transmission of light (au) using a colorimeter, for 10 minutes, how does the presence of earthworms influence the growth of stem in length [cm] of monocots (avena sativa) and dicots (phaseolus vulgaris) as measured by the mean height of the stem through 25 days, what is the effect of the concentration (0%, 20%, 40%, 60%, 80%, 100%) of tea tree (melaleuca alternifolia) oil on the growth of bacteria (non-pathogenic dh5- alpha escherichia coli) measured in the diameter of the inhibition zone around the paper disc, fast track your coursework with mark schemes moderated by ib examiners. upgrade now 🚀, how does the variety of capsicum annuum l. (green bell pepper, yellow bell pepper, red bell pepper, red sweet long pepper) and allium cepa l. (yellow onion, red onion, white onion) influence their vitamin c content in mg/100g, as measured by vegetable juice volume needed to titrate 2 ml of 0.1% dcpip solution, what is the effect of the socio-economic development of european countries, as measured by the hdi, on the mortality rate from hypertensive heart disease within the older population (50+), how does the rate of saccharomyces cerevisiae fermentation, measured by volume of co2 produced (in cm3) over a period of time (5 minutes), change with type of sugar (glucose, fructose, lactose, maltose, sucrose), how does the concentration of lactose, altered by diluting whole milk with water at five different concentrations (20%, 40%, 60%, 80%, 100%), affect the rate of lactase activity, measured by how quickly glucose is produced, to what extent do the different acidity levels of acidic, neutral, and alkaline solutions on the ph scale affect the coloration of teeth, how does changing the concentration of coffee solutions (0.000%-1.000%) affect the hydrolysis of egg albumin by using the stomach enzyme, pepsin, after a period of 20 minutes, investigating the effects of using different types of tea on the number of successful germinations of lentils (lens culinaris), how does the increase in the mean body mass index (bmi) (24.0 – 30.9 kg/m2 ) for countries have an effect on their case-fatality (%) of patients with sars-cov-2, measured using the overall deaths and cases of sars-cov-2 patients in the countries, using the databases of world health organization, and johns hopkins coronavirus resource center, how do varying concentrations (0.0,0.1,0.2,0.3,0.4,0.5mol/dm3) of sucrose (c12h22o11) affect the cell respiration rate in yeast (saccharomyces cerevisiae) by measuring the volume of carbon dioxide (co2) gas released after yeast activation using a gas syringe over a period of 10 minutes, how will differences in soluble fiber concentrations, ranging from 0% to 2%, affect the rate of hydrolysis of starch in 10 minutes, using a pancreatic amylase enzyme, what is the effect of different kcl percentage concentrations (0.0, 0.5, 1.0, 1.5, 2.0, 2.5) on the germination rate of triticum aestivum., how do different temperatures (15.0℃, 20.0℃, 25.0℃, 30.0℃, 35.0℃ ± 0.5℃) affect the lactase enzymatic activity in milk determined by the glucose levels (mmol/l) presented after its incubation period (60 minutes) measured using a blood glucose meter, what is the correlation between the human development index (hdi) and the prevalence rate of type 2 diabetes (measured in the number of prevalence by 100 people) in countries worldwide, how do varying concentrations of aloe vera gel (10%, 20%, 30%, 40%, 50%) in a ph balanced solution (ph 4) affect the percentage dehydration of red delicious apples (malus domestica) measured by the change in mass (g) after a period of 7 days, how do the emissions in metric tons of a country affect the incidence rate of non-communicable diseases (lung cancer and chronic obstructive pulmonary disease) per 100,000 people in europe, what is the effect of the volume of copper sulphate solution (0 cm3, 2 cm3, 4 cm3, 6 cm3, 8 cm3) added on the rate of hydrogen peroxide decomposition catalysed by catalase as measured by the height of the oxygen bubbles produced (mm) in 15 minutes, how do different concentrations (0%, 20%, 40%, 60%, 80%, 100%) of tea tree (melaleuca alternifolia) oil affect the growth of bacteria (non-pathogenic dh5-alpha escherichia coli) measured in the diameter of the inhibition zone around the paper disc, how is the daily growth rate of lemna minor populations influenced by increases in phosphorus concentrations within closed aquatic systems, what is the effect of increasing fe (iii) concentration (2mg/l, 4mg/l, 6mg/l, 8mg/l, 10mg/l) on the growth of duckweed (lemna minor) in terms of change in number of leaves over 5 days, how do altering salicylic acid concentrations (0.0%, 0.5%, 1.0%, 1.5%, 2.0%) affect the germination of capsicum annuum longum seeds measuring the radicle length (mm) of the sprouts of over 7 days, what is the correlation between human development index and case-fatality rate due to breast cancer per 100,000 people in 2020 among very high and highly developed european countries in female populations aged 45 or more, what is the effect of the aspergillus species present (a. luchuensis and a. luchuensis mut. kawachii) and the concertation of koji used (0.0%, 10.0%, 20.0%, 30.0%, 40.0%) on the process of amazake fermentation measured by the change in ph over the period 6 hours at a temperature of 60.0°c, how does the concentration of sodium chloride ions (0.0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8 )% affect the rate at which -amylase hydrolyses starch, measured as the rate of change of absorbance values/ au s-1(±0.001) of starch in iodine solution using a spectrophotometer, (light wavelength set at 430nm) in 300s, how do varying concentrations of hydrogen peroxide (0%, 1.5%, 3.0%, 4.5%, 6.0%, 7.5%) affect the radicle length (mm) of vigna radiata during its one-hour imbibition (pre-germinative seed soaking) before seed germination over a time period of 72 hours, how does increasing the concentration of h2o2 (0%, 1%, 1.5%, 2%, 2.5% and 3%) affect the germination rate (%) of vigna radiata (mung beans) and the radicle length of each seed measured in mm over 48 hours, what is the correlation between the human development index (hdi) of 30 countries in europe and the incidence and mortality rates of lung cancer (measured as incidence and mortality rate per 100,000), how does the use of germination stimulators; mineral “seedboodster plus” and hummus-based “brunatne biozloto” affect germination capacity (gc), germination speed (gs) and mean germination time (mgt) of fresh and old seeds of alfalfa (medicago sativa), the effect of the concentration of myrrh solution on its antibacterial properties, investigating the effect of different colour temperature light sources on the growth of common wheat (triticum aestivum), how do different concentrations of sugar solution (10%, 25%, 40%, 55%, 70%) affect the change in mass (g) of 2g powdered eggshells, via the production of lactic acid from 0.46g of escherichia coli (k-12) over 24 hours, how do variations in the concentration of a hcl(aq) solution (0.00, 0.25, 0.50, 0.75, 1.00 mol dm-3) affect the absorbance of light at 565 nm (au) by 2 g of solid egg albumen hydrolyzed by a 3% pepsin solution, the relationship between interpupillary distance and binocular field of vision in humans aged 17/18, how does varying the sucrose concentration (0%, 10%, 20%, 30%, 40%) have an effect on the volume of carbon dioxide (ppm) produced measured using a vernier co2 sensor during yeast fermentation of sucrose (c12h22o11) by brewer’s yeast (saccharomyces cerevisiae) over a period of 8 minutes, how does altering hydrogen peroxide concentration (0%,1%,2%,3%,4%,5%) affect the rate of germination of vigna radiata (by measuring radicle length in mm), how do the unstable, rising global temperatures caused by global warming and lower ph in acid rains impact the number of germinated seeds of lolium perenne.

30 IB Biology IA Topic Ideas!

Are you struggling with choosing your topic for your IB Biology IA? Don’t worry, we’ve all been there. Finding a topic is one of the – if not THE – most important part of writing your IA, so we want to make sure that you get it right! Luckily, there are so many great topics to choose from, and we’ve asked some of our top team to note down some topics that might inspire your own incredible research!

NOTE: These topics are purely meant as inspiration and are not to be chosen blindly. Even though many of these topics led to high scores for some of our graduates in the past, it is important that you listen to the advice of your subject teacher before choosing any topic!

Get Support from a Top Tutor Today

At Lanterna we have hundreds of tutors who smashed Biology. They know exactly how to get a 7 in your IA and exam and can give you tips and tricks on how you can do the same. What are you waiting for? Get your own tutor today!

Biology ia ideas with independent variables

1, Look at the genetic similarities and differences between species, kingdoms, phylas, classes, genuses, orders, families, and domains.

2, Testing global warming: How does CO2, water vapour, oxygen, or any other variable affect temperature inside a cutoff bottle exposed to simulated sunlight?

3, Describe how the primary productivity of algae changes with temperature, algae concentration, other aquatic plants, salinity, nutrients, and any other variables you may want to consider.

4, How does varying the gel concentrations of agarose affect DNA migration through a gel?

5, Effect of BMI on skin surface temperature in various body areas on rate of recovery once exposed to cold.

6, How does sudden change in body position affect heart rate and baroreceptor feedback?

7, How do the respiration rates of baker’s yeast and wine yeast in various sugar solutions compare?

8, How do the buffering actions of milk, yogurt, juices, detergents etc. compare?

9, Do our reaction times slow down with age?

10, Can we slow down the decaying times of vegetables? Can temperature, humidity, or exposure to sunlight affect how quickly vegetables decay?

Need inspo for Physics too? Check out some Physics IA ideas here !

11, What is the effect of the salt concentration on germination of different types of seeds?

12, What happens after the best-by date of dairy products?

13, Comparative study between 5 different species of animals using BLAST analysis to determine evolutionary history

14, What is the respective change of allele frequency when initial frequencies are manipulated?

15, Analysing the impact of river pollution on marine life.

16, Determine the effect of glucose concentration on the rate of osmosis.

17, What is the effect of pests on the diversity of plants in a lawn?

18, What is the effect of isotonic drinks on rehydration and recovery after exercise?

19, What is the difference in the CO2 levels exhaled before and after enduring physical exercise?

20, Testing the effectiveness of different types of toothpaste in inhibiting the growth of different types of bacteria.

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21, The effect of temperature / light on fruit ripening

22, Exploring stomatal density in a variety of conditions

23, Testing the effectiveness of toothpaste types

24, Investigating the effect of smoke water on the germination and growth of E.pilularis

25, Exploring the effect of sunlight on biomass

26, Exploring effect of light levels on the predation of the peppered moth

27, Investigating the effect of different light intensities on water weeds

28, How do different antibiotics interact with the process of seed germination?

29, Determining the effect of time on the plasmolysis of potatoes

30, Exploring mollusc shapes with regards to an external variable e.g. location on shore

So there we have it! 30 Biology IA topic ideas to get your lab report started! Still feeling a bit uneasy about the task ahead? Fear not, we have elite Biology tutors who can assist you through the process!

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30 Captivating Biology IA Topic Ideas for IB Students

1- look at how temperature affects enzyme function.

This proposed IA topic is about looking into how changes in temperature affect how enzymes work. Proteins called enzymes speed up chemical processes in living things. The optimum temperatures for the activity of various enzymes vary. Students may learn more about the connection between temperature and enzyme activity by doing experiments in which they try out various temperatures and record the results.

2- Investigating how various light wavelengths affect plant development.

For photosynthesis to take place, which is crucial for plant growth and survival, plants need light. Yet, the impacts of various light wavelengths on plant development are distinct. Students can learn more about the relationship between the wavelength of light and how plants grow by doing experiments with different wavelengths of light and watching how the plants grow.

3- Analyzing how various medicines affect bacterial growth

To combat bacterial infections, antibiotics are often prescribed. Antibiotics are drugs that inhibit the development of germs, yet they all work somewhat differently. Seeing how different drugs affect the growth of bacteria can help scientists figure out how well antibiotics work against different types of bacteria.

4 - Examining the impact of various salt concentrations on osmosis in potato cell cultures

Water molecules undergo osmosis as they go from a high-concentration region to a low-concentration region separated by a semipermeable membrane. By changing the concentration of solutes on either side of the membrane, salt may impact the rate of osmosis in potato cells. Students can test the relationship between the amount of salt in potato cells and the rate of osmosis by adding different amounts of salt and watching the rate of osmosis.

5- Investigating the Role of pH in the Photosynthesis of Aquatic Plants

The rate of photosynthesis in aquatic plants may be altered by changing the pH of the water. Students may learn more about how changes in pH affect the photosynthetic rate of aquatic plants by doing their experiments. ‍

6- looking at how varying sugar levels affect yeast fermentation

Yeast cells transform sugar into alcohol and carbon dioxide via a process called yeast fermentation. The concentration of sugar may influence the pace of fermentation. Students may test the correlation between sugar content and yeast fermentation by brewing a batch with varying quantities of sugar and monitoring the pace of fermentation.

7: Researching how physical activity affects blood pressure and the heart rate

By boosting the body's need for oxygen and nutrients, exercise has the potential to raise heart rate and blood pressure. Exercise has been linked to improved cardiovascular health, which students can study by measuring their heart rate and blood pressure before and after a workout.

8- Examining Caffeine's Impact on Reaction Times

As a stimulant, caffeine may influence cognitive processes such as response speed. Students may learn more about how caffeine affects response time by taking a test before and after they consume caffeine. ‍

9. Researching the impact of CO2 levels on insect respiration rates

Insects can't breathe in high amounts of carbon dioxide because it prevents them from exchanging oxygen and carbon dioxide. Students can learn more about the link between CO2 levels and how fast insects breathe by doing experiments with different levels of CO2 and watching how the insect breathing rates change.

10 - Investigating the impact of various fertilizers on plant development

Fertilizers are helpful because they give plants the nutrients they need to grow well. However, different fertilizers have different effects on how plants grow. Students can find out how well different fertilizers work by doing experiments with them and watching how plants grow.

11- Studying how changing temperatures affect bacterial development

To thrive, bacteria need to be kept within certain temperature ranges. Students may learn about the correlation between temperature and bacterial growth by doing their experiments at varying temperatures and recording the results. ‍

12 - Analyzing the impact of various antacids on gastric acid

Those who have acid reflux or heartburn often use antacids, which are drugs intended to neutralize stomach acid. The effects of various antacids on stomach acid might vary. Students may learn more about which antacids are best for treating acid reflux by seeing how each one affects stomach acid.

13- Researching the Role of Noise on Plant Development

Sound waves may affect plant development by influencing hormone secretion. Students can look into the link between sound and plant growth by playing different sounds for plants and then watching how they grow.

14- Studying the Impact of Hydrogen Peroxide Concentrations on Catalase Activity

Hydrogen peroxide may be decomposed into harmless water and oxygen with the help of an enzyme called catalase. Hydrogen peroxide concentration may modulate catalase activity rate. Students may learn more about the correlation between hydrogen peroxide levels and catalase activity by doing their experiments.

15—Investigating how changing the pH of saliva affects the amylase enzyme's activity.

The salivary enzyme amylase breaks down carbohydrates into simple sugars. Saliva's pH may affect how active amylase is. Students may learn about the correlation between pH and amylase activity by testing the effects of varying the pH of their experiments. ‍ Hire Your IB Online Tutor Now

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Biology IA Topics: 20+ Great Ideas to Get You Started

by Antony W

September 5, 2022

There’s nothing worse than trying to brainstorm and search for Biology IA topics only to come out empty.

The problem is:

There’s a lot to explore in Biology that it proves challenging to determine what topic would be suitable to investigate from the hundreds of possible options. So if you’re having a difficult time figuring out what topic to explore, we can understand.

In this post, we’ll share a list of the best IB Biology IA topics that you can use either for inspiration to help you come up with a topic of your own or as a modified topic for further research.

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Use our Internal Assessment writing service to get professional academic writing help from our team. Our writers are experts in writing IAs, and we guarantee high quality assignments that earn top marks.

IB Biology Internal Assessment (IA) Topics

Coming up with an IB Biology IA topic to explore isn’t difficult if you understand the requirements. Like Physics and Chemistry , your IA in Biology must focus on scientific writing and research in the Biology subject.

Below is a list of 30+ topic ideas for Biology Internal Assessment:

Assessment of the effect of temperature on the vitamin C content of various juices
What effect can quick shifts in body posture have on baroreceptor feedback and pulse rate?
How do detergents, drinks, yogurt, and milk stack up when it comes to buffering?
How does the ideal pH affect the growth rate of pinto and green beans? Proven Through Experiment
The temperature dependence of the activation energy released during the decomposition of H2O2 utilizing the catalase enzyme and aluminum inhibitor as catalysts.
To what extent does organic household waste affect the germination and emergence of tomato seeds?
Investigating the Role of Carbonated Drink Volume and pH in Tooth Erosion/Decay
In vitro Studies of Aluminum Chloride's Effects on the Liver Catalase Enzyme's Degradation of Hydrogen Peroxide
Changes in seashell mass and carbon monoxide (CO) emitted during the reaction as a function of HCL concentration
Does river pollution threaten the source of water for marine life?
Fruit ripening as influenced by environmental factors including light and temperature
How can we evaluate the respiration rates of wine yeast and baker's yeast in various sugar solutions?
What happens to DNA movement as the concentration of the agarose gel changes?
Compare the top and bottom 25 nations in terms of HDI and their rates of lung cancer-related mortality using secondary data.
How does body mass index (BMI) affect the skin's surface temperature and the pace at which it recovers after exposure to cold?
Hydrogen peroxide breakdown rate influenced by presence of various metal ions (H,O.).
Using the Silver Nitrate titration method, how much variation exists between the chlorine concentrations (mg / L) of several locally accessible brands of treated water?
How post-workout use of energy drinks affects cardiovascular function and blood pressure
How do energy drinks affect blood pressure and heart rate following exercise?
How do varying amounts of lactases affect the efficiency with which lactose and other disaccharides in milk are digested?
Is there a correlation between the presence of home furnishings and stunted plant development?
In terms of the pace of hydrochloric acid neutralization, as assessed by the difference in change in pH levels in 5 minutes, how do cumin and turmeric powder compare to indigestion tablets?
What effect does zinc chloride concentration have on plaque development?
What happens to the length of Citrus limon roots as the Oxytetracycline concentration is raised from 5 mg/L to 10 mg/L?
Is there a correlation between the pH of spoiled milk and the temperature at which it was stored?
How can the opposing effects of temperature and light intensity on the time it takes for photosynthesis to occur cancel each other out?
How can the acidity of certain drinks contribute to tooth decay?
What happens to your heart rate if you suddenly start working out hard, and how much of an effect does warming up have on your maximum heart rate
How effective are natural antiseptics such as ginger and turmeric compared to store-bought alternatives?
How potent are synthetic antibacterial treatments in comparison to natural antibacterial remedies?
What effect does sodium chloride have on bougainvillea seed germination at various concentrations?
What effect does soil composition have on the propagation of a plant's offshoots?
How much does the amount of sodium nitrate powder used to preserve meat reduce its quality?
For what reason does moringa seed and leaf extract (herbal medication) inhibit the growth of dandruff-causing Malassezia yeast (Pittosporum)?
Which laundry detergent is best in breaking down lipids and getting rid of stains?
When it comes to radishes, how does the salinity of the water effect their development rate?
Does Gibberellic acid influence dolly Parton rose germination, and how does it react at various concentrations?

Assessed internally and moderated externally by the IB, Biology IA at SL and HL accounts for 25% and 20% of the final grades respectively. Your teacher will assess your work out of 24 based on well-defined assessment criteria. As such, you should work on a topic that you can explore comprehensively within the scope of the assignment.

Final Thoughts

The IB Biology IA assignment isn’t as lengthy as the extended essay in the same subject, but it can be quite involving. You’ll conduct extensive experiments and the writing process is going to be somewhat longer.

To have an easy time working on the subject, it’s best to choose a topic that interests you, so you can focus on an area that you’ve always wanted to explore.

Given that we’ve shared over30 topic ideas with you, you shouldn’t have a difficult time figuring out what to work on.

About the author

Antony W is a professional writer and coach at Help for Assessment. He spends countless hours every day researching and writing great content filled with expert advice on how to write engaging essays, research papers, and assignments.

IB Biology Internal Assessment Solved: A Guide to Acing Your Biology IA

What is a Biology IA?

The Biology Internal Assessment (IA) is a take home report on a research question of your choice. It is worth 20% of your final grade and thus it is important to perform well in it. The Biology IA can be daunting. It has a 16-page limit, which might seem like a lot to do, but towards the end of the IA you’ll be wishing you had more pages to work with. This guide is aimed to help you ace the IB Biology IA and to answer any questions you may have.

Choosing a Research Question

The most difficult part of the IA is choosing a research question. There are thousands of topics out there all of which are interesting. However unfortunately when conducting research, you are restricted to scope and the equipment which is available. Well how can you find a topic?

In order to find a topic, I would first choose a syllabus point which sounds appealing to you. Once you have found a syllabus point start googling experiments which have been conducted on that point. They do not have to be identical. DO NOT choose the first experiment you find. I would recommend collecting multiple experiments and read through all of them noting down how it was conducted and whether they had any unanswered questions.

These unanswered questions should be used as motivation when creating a research question. From here you can conduct further research to determine whether it is in the scope or not. If it is then you now have a research question to base your IA off. If it is outside the scope attempt to simplify the question or narrow the focus to that of which you can work with.

Conducting Research

Now that you have your research question it is time to gain background knowledge. Background knowledge is crucial as not only does it enhance your understanding of the topic, but it will be used in your IA to help the reader understand the topic.

When conducting research, the biggest mistake people make is using refutable sources. I would recommend using only published research articles as they have the most evidence to support their claims. This will enhance the reliability of your IA as information you are using is backed up by multiple sources. HOWEVER, it is crucial to ensure that you reference in APA format. We will explore referencing later in the article.

The research you gather should be used in your IA to explain to the reader the reasoning behind your question and to explain any concepts which may be confusing or abstract.

Undergoing the Experiment

Once you have conducted your research you are ready to create your method. The method you create to conduct the experiment is the same method you will place in your report. So, I would recommend that your method is detailed and concise. To ensure this, pretend that you are writing a method to someone who has never conducted an experiment before. This not only makes the method easy to follow for others, but for yourself too, ensuring that the experiment is conducted smoothly.

It is important that you conduct multiple trials. This will be explored in your evaluation as the more trials you conduct the more accurate and reliable your results become. However, when conducting multiple trials, try to conduct them during the same time period as it reduces the number of controlled variables.

Also, keep in mind that there is a possibility that the experiment may not work or that it may have varying results. If that occurs, do not stress, it is completely normal and will give you more to discuss later in the evaluation.

Writing the Report

Now for the fun part. Writing the report. When writing the report there are some sections which are more difficult than others. Below I will explore the sections most students find difficult to complete in a coherent manner.

Background Information

This section involves the most external information. Here you will collate all the information you have gathered on your research question and explore it. One key mistake students make is they do not systematically explore the information. I would recommend inserting subheadings for the various concepts you will explore, ie: 1.1: Photosynthesis, 1.2: electromagnetic spectrum, 1.3 Mentha spicata L, spearmint. Through using subheadings, it becomes easier for the marker to follow the report.

Paraphrase, Paraphrase & Paraphrase. One common mistake students make is that they “dump” information into their report and reference it. AVOID THIS. Instead, I would recommend paraphrasing information, explaining it and its relevance to the report.

Materials, Risks, Environment and Variables

Listing materials is easy and is probably the easiest part of the IA. However, many students do forget to insert the uncertainties for measuring instruments. This is very important as uncertainties must be explored in the weaknesses section for the IA.

Risk assessment should be included in the IA. It ensures that potential hazards which may arise during the experiment have been identified and precautions installed. It also ensures that if someone were to repeat the experiment, they are also aware of the dangers.

The experiments should all be ethical. Hence, environmental considerations should be addressed to show that ethical considerations were taken into account and methods were implemented to ensure the environment was not harmed.

All variables should be discussed in the report. This includes independent, dependent and controlled variables. When listing the variables, it should be discussed how they were controlled and why they should be controlled. This increases personal engagement, as it shows the marker that there was constant reflection being conducted.

Qualitative and Quantitative

When discussing results, both quantitative and qualitative results should be discussed. When discussing quantitative results, I would recommend using tables and graphs. It allows for clear and concise representation of information and allows for easier comparisons and discussions. Averages and standard deviation for the graphs and tables should be explored, as they allow for more accurate and justified conclusions to be drawn. Other tests such as t test, Tukey’s statistical difference test or chi squared test can be used to enhance the IA and discussion of results.

Qualitative analysis consists of differences which can be visually identified. Here you discuss differences in visual representation before the experiment was conducted to after the experiment.

Strength vs Weakness

Strengths: In this section I would recommend listing 2-3 strengths and commenting on how they affected the report or experiment.

Weaknesses: In this section I would recommend listing 5-6 weaknesses, and commenting on how they affected the report or experiment. You should then explore how you can improve this if you were to conduct the experiment again.

Further Questions

At the end of the IA, I would recommend including 2-3 further questions which could be explored if you had the opportunity. This improves personal engagement as it shows the marker that you have reflected on the current experiment and thought about what else you could explore.

Reference List (APA Format)

Ensure all in text references are listed at the end of the IA in APA format and alphabetical order. If this is difficult, I would recommend using the reference tab on a word document. Once you insert the information it converts it to APA format and will list it alphabetically for you.

Remember that the examiners are focusing on the detail of your report and your reflection. If you find that there was an error in the experiment, DISCUSS IT.

Best of luck for the Internal Assessment. You’ve got this!!

Internal Assessment Guides

12 Examples and Tips for IB Biology IA

May 4, 2022 | IB subjects

IA is one of the many things IB students struggle with, but some might feel that writing the IA in Biology is especially confusing since it covers broad topics. This post is for those who are having a hard time coming up with a topic, are worried about writing the IA in Biology overall, or are interested in Biology but not so sure about taking it because of IA. An overview of the subject IB Biology can also be seen in a previous post: Exam Strategy for IB Biology (HL/SL) .

1. Overview of Biology IA

Both HL and SL students are expected to write an IA ( Internal Assessment ) in Biology which accounts for 20% of the final grade . The IA in biology is expected to be a 6-12 pages long report about an investigation a student carries out based on their own hypothesis.

1.1 IA Criteria

HL and SL share the same IA criteria and it’s important to understand the criteria before and while carrying out the investigation for your IA. (Reference: Biology Teacher Support Material )

2. Examples of Biology IA Topics

Many IB graduates have kindly answered an online survey by MakeSensei and given examples of IA topics in IB Biology. Some of them are RQs (Research Questions), so you might want to see the pattern of how they make RQs for your future IA.

What is the effect of exposure to different concentration of sodium chloride solutions for different duration time on the germination percentage, mean germination time, and relative injury rate of Ipomoea aquatica?
Lactic acid experiment in milk
What is the effect of sodium chloride concentration (0.0, 0.4, 0.8, 1.2, 1.6, and 2.0 %) on the rate of hydrolysis of 1.0 % starch solution by 2.0 % ɑ-amylase (Bacillus subtilis), measured as the rate of decrease in absorbance value (Au s–1), using Spectrophotometer Vis at 434.2nm?
Protein-digestive enzyme
What is the effect of fertiliser quantity on evening levels of dissolved oxygen in river water samples over a period of two weeks?
An Investigation into the Effect of Different Types and Concentrations of Pesticides (Orthoran Acephate, Kadan Safe, Kadan Plus DX) on Seed Germination: Observing Plant Growth of ErucaSativa, Brassica Oleracea, Lepidium Sativum and Perilla Frutescens
An investigation into the effect of sodium chloride on plant germination and its growth.
(Title: How to make delicious natto) RQ: What is the effect of pre-soaking time of soybeans, 0.00, 3.00, 6.00, 9.00, and 12.00 hours (±0.05 hours), on the length of threads between separated fermented soybeans (natto) measured by a clear plastic ruler (±0.1cm)?
Effect of light intensity on the travel activity of a Physella acuta
Investigating the effect of concentration of the salt solution on germination and growth of cotton and spinach seeds
Investigating the correlation of the length of knee roots of a mangrove and the number of holes crabs make in the given area
Effect of temperature on denaturation of albumin protein

3. Tips for Biology IA

3.1 Set Appropriate Independent/Dependent Variables

In order to carry out the investigation with sufficient sample size and trials, there needs to be independent and dependent variables that are both appropriate in terms of the purpose of your investigation. If you want to find out the relationship between X and Y (how X influences Y), then your independent variable should be X and your dependent variable should be Y. Both variables should be measurable , meaning quantitative, to allow various statistical analyses. But having qualitative data is valued in discussion as well.

3.2 The More Data, The Better

It is known that you should have at least 25 samples of data for your Biology IA, but let us explain why. While having multiple trials is necessary for the investigation, each trial should also have multiple samples. Therefore, 5 trials with 5 samples each make up 25 samples in total. Having said that, your sample size is up to you, and having more than 25 samples would only make your data more robust . But make sure you have enough time and energy to process the whole data.

3.3 Use Appropriate Secondary Sources

Doing background research on the field you’re focusing on in IA is required to back up your hypothesis, discussion, and conclusion. A lot of people use secondary sources (sources that are not first-hand) and most often through the internet. But, using Wikipedia or personal blogs would not be appropriate for your IA because they may not be reliable, accurate information. Instead, you might want to use these websites to search for previous academic articles and journals.

Google Scholar
The World Factbook (provides you data about the country of your interest)

3.4 Don’t Forget Annotations and Citations

Annotations

An annotation is a short comment written near an image to give an explanation. Annotations are necessary when the image and its title don’t give enough explanation to specific objects in the image and your word count is limited. For example, when you’re showing your method with an image of instruments, readers might not understand why you chose those instruments to carry out your experiment. To avoid such inconvenience, annotations provide more detailed information than the title and the main text.

A citation is a short version of the reference to your source and it needs to be in-text or footnote. Every time you mention something that is not original or first-hand, you need to put citation(s) to prove where that statement comes from. If you miss citations, it will be considered plagiarism and you could fail the IB. Therefore, citations are important!! You could use Citation Machine to create a reference list and citation for each reference (check which style is preferred by your teacher).

IB subjects
Intro to IB

50 Biology IA Topics: Essential Selections for Learners

What is Biology IA

What are the Essential Components of the IA

Biology IA Topics

How Can I Prepare for a Biology IA

Final words.

I've witnessed firsthand the transformative power of engaging with the right research question in biology. Drawing from years of experience and a deep understanding of the subject, I've curated a list of 50 Biology IA topics to guide students and researchers alike. This compilation is more than just a list; it's a bridge connecting curious minds to the vast and intricate world of biological sciences. Each topic has been carefully selected for its potential to challenge, inspire, and contribute to our growing body of knowledge. Whether you're exploring the microscopic intricacies of cell biology or the complex ecosystems that sustain life on Earth, these topics are designed to foster a profound appreciation for the living world and its phenomena.

What is Biology IA (Internal Assessment) ?

The IA involves the submission of a lab report by students as part of their IB biology curriculum. Until May 2025, the report must be between 6 and 12 pages, encompassing a research question, methodology, data analysis, and a conclusion. Starting from May 2025, the report's length will be capped at 3,000 words.

IA should begin with a research question that is not only testable but also deeply rooted in the biology syllabus. This question must be closely aligned with the curriculum, precisely defined, and specific. In the methodology section, a detailed account of the research process, including the materials and methods utilized, should be provided. This section must be thorough, clearly describing the research steps, resources employed, and any ethical considerations addressed. Analyzing the gathered data is a critical phase of the IA. Students are expected to organize their data neatly and apply suitable statistical methods for analysis, interpreting their findings accurately. They should also discuss any study limitations and the broader significance of their results. The conclusion should encapsulate the study's key outcomes, linking them directly to the initial research question, and suggest areas for future investigation. Moreover, students must submit a reflective statement as part of their IA. This narrative, approximately 500 words, should ponder the student's learning journey throughout the IA process. It should cover the student's personal experiences, highlighting both triumphs and obstacles faced, assess their performance and the competencies developed during the assessment, and provide a thoughtful evaluation of the entire experience. Throughout this process, students may find tools like " essay typer free " helpful in articulating their thoughts and insights effectively.

List of 50 Biology IA Topics

Deep Dive into the Syllabus: Start by thoroughly understanding the IB Biology syllabus. Knowing the curriculum inside out helps you identify areas that interest you and align with the IA requirements. It also ensures that your research question is relevant and grounded in the course content.
Practice Lab Report Writing: Enhance your lab report writing skills by practicing regularly. Familiarize yourself with the structure and conventions of scientific writing. Pay special attention to clarity, coherence, and the logical flow of information. Consider reviewing exemplar lab reports and seeking constructive feedback from teachers or peers.
Seek Feedback Early: Don't wait until your IA is fully developed to seek feedback. Discuss your ideas, research question, and methodology with your biology teacher or an IB tutor early in the process. Regular feedback can help refine your approach, identify potential pitfalls, and ensure your project is on the right track.
Master Data Analysis Techniques: A significant part of the IA is analyzing the data you've collected. Brush up on your statistical skills and familiarize yourself with software or tools that can aid in data analysis. Understanding how to interpret your results accurately is crucial for drawing meaningful conclusions.
Reflect on Your Learning: The IA is not just about demonstrating your knowledge of biology; it's also an opportunity to reflect on your learning process. Engage in self-reflection throughout your IA journey, noting what you've learned, challenges you've encountered, and how you've overcome them. This reflective practice not only enhances your IA but also contributes to your personal growth as a learner.
The Effect of pH on Enzyme Activity: Investigate how different pH levels affect the activity of a specific enzyme, such as catalase found in potato cells. You'll need pH buffers, potato extract, hydrogen peroxide, and a spectrophotometer to measure the reaction rate. This experiment explores how enzyme function is influenced by pH, demonstrating the importance of homeostasis in biological systems.
Photosynthesis Rate under Different Light Colors: Examine how light color affects the rate of photosynthesis using aquatic plants like Elodea. You'll need light sources of different colors, a carbon dioxide indicator solution, and a timer. By measuring oxygen production or CO2 consumption, students can understand how light wavelength influences photosynthetic efficiency.
The Effect of Temperature on Bacterial Growth: Explore how temperature impacts the growth rate of bacteria such as E. coli. Required materials include bacterial cultures, nutrient agar plates, incubators set at different temperatures, and a colony counter. This experiment highlights the importance of temperature in microbial ecology and food safety.
Plant Growth in Different Soil Types : Investigate how various soil types affect plant growth. You'll need seeds (such as beans), different types of soil (sand, clay, loam), pots, and a ruler to measure growth. This study can reveal the importance of soil composition on plant health and yield, essential for agriculture and ecology.
The Impact of Salt Concentration on Seed Germination: Study how varying salt concentrations in water affect the germination rate of seeds like radishes. Materials include seeds, petri dishes, filter paper, and salt solutions of different concentrations. This experiment simulates the effects of soil salinity on plant life, relevant to understanding agricultural challenges and ecosystem responses to salinity.
Caffeine's Effect on Daphnia Heart Rate : Examine the impact of different caffeine concentrations on the heart rate of Daphnia magna. You'll need a microscope, Daphnia, caffeine solutions, and a stopwatch. This experiment introduces students to the physiological effects of stimulants and the concept of dose-response relationships in pharmacology.
The Role of Light Intensity on Plant Stomatal Density: Investigate how varying light intensities affect stomatal density in leaf specimens. Necessary materials include leaves from plants grown under different light conditions, a microscope, and clear nail polish for leaf impressions. This study explores how plants adapt to their light environments, affecting gas exchange and water loss.
Antibiotic Resistance Spread in Bacteria: Explore how antibiotic resistance spreads among bacterial populations. Use antibiotic discs, bacterial cultures, nutrient agar, and an incubator. This experiment demonstrates the mechanism of natural selection and the importance of antibiotic stewardship in healthcare.
The Effectiveness of Natural vs. Synthetic Antibacterials: Compare the antibacterial efficacy of natural substances (e.g., garlic, honey) versus synthetic antibacterials (e.g., commercial disinfectants). Materials include bacterial cultures, nutrient agar plates, paper discs soaked in antibacterial solutions, and an incubator. This topic highlights the potential of natural substances in fighting bacteria and the concept of antibiotic resistance.
The Influence of Music on Plant Growth: Investigate the effect of different types of music on plant growth rates. You'll need plants, speakers, and various genres of music. By measuring growth over time, this experiment can explore the intriguing possibility of sound waves affecting plant physiology.
Osmosis in Potato Tissue: Examine how osmotic balance is affected by salt or sugar solutions using potato strips. Materials include potato strips, various concentrations of salt or sugar solutions, and a balance. This simple yet effective experiment teaches the principles of osmosis and cell membrane permeability.
The Impact of Different Fertilizers on Algae Growth: Study how various fertilizers influence algae proliferation in water samples. Required materials include water samples, different types of fertilizers, and a light source. This experiment highlights the issue of nutrient pollution and eutrophication in aquatic ecosystems.
The Role of Mycorrhizal Fungi in Plant Growth: Investigate the impact of mycorrhizal fungi on the growth of plant roots. Materials include plant seedlings, mycorrhizal fungi inoculum, and soil. This study sheds light on the symbiotic relationships in ecosystems and their importance for plant nutrition.
The Effect of Acid Rain on Plant Growth: E xamine how simulated acid rain (using solutions of different pH levels) affects the growth of plants. Materials include seedlings, pH-adjusted water solutions, and growth measurement tools. This experiment explores environmental stressors on plants and the broader implications of pollution.
Genetic Diversity in Plant Leaf Morphology: Analyze the genetic diversity within a plant species by comparing leaf morphology. You'll need leaves from various individuals of the same species, a scanner or camera, and image analysis software. This project introduces concepts of genetic variation and its observable effects in populations.
The Effects of Microplastics on Brine Shrimp Survival: Investigate the survival rate of brine shrimp in water with varying concentrations of microplastics. Use brine shrimp, microplastic particles, and tanks. This study highlights environmental issues and the impact of pollutants on aquatic life.
Comparing Plant Transpiration Under Different Humidity Levels: Examine how different environmental humidity levels affect plant transpiration rates. Materials include plants, plastic bags to create humidity conditions, and a balance to measure water loss. This experiment explores plant water relations and adaptations to environmental stress.
The Influence of Mobile Phone Radiation on Seed Germination: Study the effect of electromagnetic radiation from mobile phones on the germination rate of seeds. You'll need seeds, mobile phones, and controlled germination environments. This project investigates the potential impact of technology on biological processes.
Assessing Vitamin C Degradation in Fruit Juices Over Time: Measure the degradation of vitamin C in various fruit juices stored at different temperatures over time. Use fruit juices, vitamin C test strips or a titration kit. This experiment explores nutrient stability and the factors affecting it.
The Impact of Exercise on Human Heart Rate Recovery: Analyze how different intensities of exercise affect heart rate recovery in humans. Materials include a heart rate monitor, stopwatch, and volunteers. This study sheds light on cardiovascular fitness and physiological responses to exercise.
Soil pH and Its Effect on Earthworm Activity: Investigate how varying soil pH levels affect the activity and distribution of earthworms. Materials include soil samples with different pH levels, earthworms, and observation containers. This experiment highlights soil health and biodiversity.
The Role of Water Temperature in Goldfish Metabolism: Examine how changes in water temperature affect the metabolic rate of goldfish, using water baths, thermometers, and oxygen probes. This study explores ectothermic metabolism and environmental adaptations.
Investigating the Allelopathic Effects of Plant Extracts on Seed Germination: Study how extracts from certain plants inhibit or promote the germination of seeds from other plants. Use plant extracts, seeds, petri dishes, and filter paper. This experiment delves into plant interactions and chemical ecology.
The Effects of Different Light Intensities on Daphnia Heart Rate: Analyze how light intensity influences the heart rate of Daphnia magna, using a microscope, light sources with adjustable intensity, and a stopwatch. This explores the effects of environmental stimuli on physiological responses.
The Efficacy of Various Water Purification Methods on Bacterial Content: Compare the effectiveness of different water purification techniques in reducing bacterial content. Materials include contaminated water samples, purification methods (filtration, boiling, chemical treatment), and agar plates for bacterial culturing. This study is relevant to public health and sanitation.
The Impact of Aeration on Water Quality and Aquatic Life: Investigate how different levels of water aeration affect the quality of water and the health of aquatic organisms. Use tanks, aerators, water quality test kits, and aquatic plants or animals. This experiment highlights the importance of oxygen in aquatic ecosystems.
Studying the Biodegradation Rate of Various Organic Materials: Compare the biodegradation rates of different organic materials under the same environmental conditions. Materials include organic substances (food scraps, paper, etc.), soil, and compost bins. This project emphasizes sustainability and waste management.
The Effect of Light Wavelengths on Algae Photosynthesis: Examine how different wavelengths of light affect the photosynthesis rate of algae, using colored filters, light sources, and a CO2 indicator. This study contributes to understanding photosynthetic efficiency and light energy utilization.
Insect Biodiversity in Different Habitats: Assess insect biodiversity across various habitats using pitfall traps, sweep nets, and identification guides. This project explores biodiversity, ecosystems, and the importance of conservation.
The Influence of Sugar Types on Yeast Fermentation: Investigate how different types of sugar (glucose, fructose, sucrose) affect the fermentation rate of yeast, using yeast cultures, sugar solutions, and gas collection methods. This experiment explores cellular respiration and biochemistry.
Assessing the Impact of Noise Pollution on Plant Growth: Study how different levels of noise pollution affect the growth of plants, using speakers to simulate noise conditions and measuring plant growth parameters. This investigates environmental stressors and plant responses.
The Role of Antioxidants in Preventing Apple Browning: Examine the effectiveness of various antioxidants (lemon juice, vitamin C solution) in preventing the browning of apple slices, comparing treated and untreated samples. This explores oxidation reactions and food preservation methods.
The Effect of Different Substrates on Worm Composting Efficiency: Compare the composting efficiency of worms in different substrates (paper, vegetable scraps, mixed organic material), measuring decomposition rate and soil quality. This highlights sustainable waste management and soil health.
Exploring Plant Cloning Techniques in Potato Tubers: Investigate the efficiency of different plant cloning techniques using potato tubers, focusing on methods like cutting and grafting, and assessing growth success rates. This introduces genetic replication and agricultural practices.
Studying the Effectiveness of Sunscreen in Blocking UV Radiation: Compare the effectiveness of different SPF sunscreens in blocking UV radiation using UV-sensitive beads or paper, highlighting the importance of sun protection and skin cancer prevention.
The Impact of Sleep Deprivation on Cognitive Function in Students: Examine the effects of varying degrees of sleep deprivation on cognitive functions such as memory and reaction time in student volunteers, using cognitive tests and questionnaires. This explores human physiology and health science.
Investigating the Rate of Water Absorption in Different Soil Types: Study how various soil types (clay, sand, loam) absorb water, using soil samples, water, and measuring equipment. This experiment is relevant to agriculture, gardening, and environmental science.
The Effect of Magnetic Fields on Plant Growth: Explore the influence of different strengths of magnetic fields on the growth and development of plants, using magnets and plant specimens. This investigates electromagnetic effects on biological systems.
Assessing the Antifungal Properties of Plant Extracts: Examine the antifungal efficacy of various plant extracts against fungal pathogens in plants, using fungal cultures, plant extracts, and agar plates. This study has implications for natural disease management in agriculture.
The Influence of Carbon Dioxide Levels on Plant Growth: Investigate how varying concentrations of CO2 affect the growth rate of plants, using controlled environments with adjusted CO2 levels. This experiment is relevant to studies on climate change and plant physiology.
Exploring the Effects of Different Pollutants on Microbial Soil Health: Assess the impact of various pollutants (oil, pesticides, heavy metals) on the microbial health of soil, using soil samples, pollutants, and microbial culture techniques. This highlights environmental pollution and ecosystem health.
The Role of Salinity in Fish Osmoregulation: Study how different salinity levels in water affect the osmoregulation mechanisms of fish, using aquariums, salinity meters, and fish specimens. This experiment explores marine biology and physiological adaptations.
Investigating the Effects of Urbanization on Bird Populations: Compare bird species diversity and population numbers in urban versus rural areas, using birdwatching techniques and data analysis. This project examines biodiversity loss and conservation in changing environments.
The Impact of Different Cooking Methods on Vegetable Nutrient Content: Examine how boiling, steaming, and microwaving affect the nutrient content of vegetables, using cooking equipment, vegetables, and nutrient testing kits. This explores nutrition science and food preparation methods.
Assessing the Effectiveness of Different Handwashing Techniques: Investigate the bacterial reduction efficacy of various handwashing techniques and products, using bacterial cultures, agar plates, and volunteers. This is crucial for public health and hygiene education.

For optimal preparation for the IA, students must have a solid grasp of the biology course content and hone their lab report writing skills. They should actively seek their teachers' input on their writing abilities and comprehension of the research methodology.

Deep Dive into the Syllabus: Thoroughly understand the IB Biology syllabus. Knowing the curriculum inside out helps you identify areas that interest you and align with the IA requirements. It also ensures that your research question is relevant and grounded in the course content.

Practice Lab Report Writing:

Enhance your lab report writing skills by practicing regularly.
Familiarize yourself with the structure and conventions of scientific writing.
Pay special attention to clarity, coherence, and the logical flow of information.
Consider reviewing exemplar lab reports and seeking constructive feedback from teachers or peers.

Seek Feedback Early: Don't wait until your IA is fully developed to seek feedback. Discuss your ideas, research question, and methodology with your biology teacher or an IB tutor early in the process. Regular feedback can help refine your approach, identify potential pitfalls, and ensure your project is on the right track.

Master Data Analysis Techniques: A significant part of the IA is analyzing your collected data. Brush up on your statistical skills and familiarize yourself with software or tools to aid data analysis. Understanding how to interpret your results accurately is crucial for drawing meaningful conclusions. ‍

Reflect on Your Learning: The IA is not just about demonstrating your knowledge of biology; it's also an opportunity to reflect on your learning process. Engage in self-reflection throughout your IA journey, noting what you've learned, your challenges, and how you've overcome them. This reflective practice not only enhances your IA but also contributes to your personal growth as a learner.

As we wrap up our exploration of these Biology IA topic ideas, I hope you've found inspiration and a starting point for your investigative journey. Each topic offers a unique opportunity to delve into the wonders of the biological world, challenging you to ask questions, seek answers, and contribute to our collective understanding of life's intricacies. Remember, the key to a successful IA lies in choosing a topic that interests you and approaching it with curiosity, diligence, and a scientific mindset. Happy researching, and may your IA journey be as enlightening as it is rewarding!

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Biology IA topics

Biology Internal Assessment is a crucial component of the International Baccalaureate Biology course, and it requires students to conduct independent research on a topic of their choice. This task aims to assess students’ understanding of scientific research and their ability to apply scientific concepts and principles to a real-world problem. In this article, we will explore some Biology IA topics that students can consider and provide some tips on how to choose the best topic for their research.

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Tips for Choosing a Biology IA Topic

Choosing a topic for your Biology IA can be a daunting task, but it can also be an exciting opportunity to explore a topic that you are passionate about. By following a few tips, you can select a topic that aligns with your interests and capabilities.

First and foremost, consider your interests when selecting a topic. Think about the aspects of biology that you find most interesting, whether it be human health, genetics, ecology, or biotechnology. By choosing a topic that you are passionate about, you are more likely to be motivated and engaged throughout the research process.

Additionally, it is important to consider your strengths when selecting a topic. Perhaps you excel in data analysis, writing, or conducting experiments. By selecting a topic that aligns with your strengths, you can leverage your skills to conduct high-quality research.

Another important factor to consider is feasibility. The topic you select should be feasible and manageable within the given time frame. It is essential to choose a topic that is specific, clear, and well-defined, which will make the research process more manageable. Additionally, the topic should be practical and achievable with the resources available, including time, equipment, and financial resources.

Consider the resources that you have access to when selecting a topic. This includes laboratory equipment, literature, and financial resources. If you are conducting an experiment, it is important to ensure that you have access to the necessary equipment and materials. If you are conducting a literature review, ensure that you have access to relevant scientific articles and journals. Furthermore, consider the cost of conducting research and ensure that you have access to the necessary financial resources.

Finally, when selecting a topic, consider the research questions that you will be investigating. A good research question is one that is specific, testable, and relevant. A good research question will allow you to conduct a study that is feasible and manageable, while also providing interesting and insightful results.

Examples of good research questions include those that involve a comparison, a cause and effect relationship, or a prediction. A comparison question might investigate the differences between two groups or conditions, such as “What is the effect of different types of fertilizer on plant growth?” A cause and effect question might investigate the relationship between two variables, such as “What is the effect of temperature on the metabolic rate of insects?” A prediction question might investigate the potential outcomes of an intervention or change, such as “What is the effect of a new drug on the progression of a disease?”

List of Biology IA Topic Ideas

When it comes to selecting a topic for your Biology IA , the possibilities are endless. If you are struggling to come up with a topic, here are some examples of potential Biology IA topics that you can consider based on your interests and strengths.

Topics related to human health and disease

If you are interested in human biology, you may want to consider investigating the effect of different diets on blood sugar levels. You can compare the effects of high-sugar, low-sugar, and low-carbohydrate diets on blood glucose levels. Alternatively, you can investigate the effectiveness of natural remedies on curing acne. There are several natural remedies that are believed to be effective in treating acne, such as tea tree oil, honey, and aloe vera. You can compare the effects of these remedies with over-the-counter acne treatments. Another topic to consider is the impact of exercise on heart rate and blood pressure. You can investigate the effects of different types of exercise on heart rate and blood pressure, such as aerobic exercise, weight training, and yoga.

Topics related to genetics and evolution

If you are interested in genetics and evolution, you may want to investigate the inheritance of traits in fruit flies. Fruit flies are commonly used in genetics research since they have a short lifespan and reproduce quickly. You can investigate the inheritance patterns of different traits, such as eye color or wing shape. Alternatively, you can investigate the genetic basis of inherited diseases. There are several inherited diseases that are caused by mutations in specific genes, such as cystic fibrosis or sickle cell anemia. You can investigate the effects of these mutations on the body and potential treatments. Another topic to consider is the impact of environmental factors on the expression of genes. You can investigate the effects of different environmental factors, such as temperature or light, on the expression of genes.

Topics related to ecology and the environment

If you are interested in ecology and the environment, you may want to investigate the impact of pollution on plant growth. You can expose plants to different levels of pollution, such as air pollution or water pollution, and measure the effects on plant growth. Alternatively, you can investigate the effect of different soil types on plant growth. Different types of soil have different nutrient levels, water retention, and pH levels, which can affect plant growth. Another topic to consider is investigating the impact of light pollution on animal behavior. Light pollution can disrupt animal behavior, including sleep patterns, foraging, and mating.

Topics related to biochemistry and biotechnology

If you are interested in biochemistry and biotechnology, you may want to investigate the effectiveness of antibiotics on different strains of bacteria. Antibiotic resistance is a growing concern, and it is important to investigate the effectiveness of different antibiotics on different strains of bacteria. Alternatively, you can investigate the effect of different concentrations of enzymes on the rate of reaction. Enzymes are critical in biological processes, and different concentrations can affect their efficiency. Another topic to consider is the use of biotechnology to produce a novel protein. Biotechnology has enabled the production of several novel proteins, including insulin and human growth hormone. You can investigate the production of a novel protein using biotechnology.

Other unique or interdisciplinary topics

Finally, there are several unique or interdisciplinary topics that you can consider for your Biology IA. For example, you can investigate the use of algae as a biofuel source. Algae are a promising biofuel source since they can produce high levels of lipids, which can be converted into biofuels. Alternatively, you can investigate the impact of music on plant growth. There are several studies that suggest that music can affect plant growth, and you can investigate this further. Another topic to consider is the effect of temperature on the metabolic rate of reptiles. Reptiles are cold-blooded animals, and their body temperature is regulated by the environment. You can investigate the effect of different temperatures on the metabolic rate of reptiles, which can have important implications for their survival in changing environments.

When selecting a Biology IA topic, it is important to consider your interests, strengths, feasibility, and the potential research questions. By choosing a topic that aligns with your passions and capabilities, you can conduct a successful research project that showcases your scientific knowledge and research skills. These Biology IA topic ideas are just a starting point, and you can tailor them to your interests and research goals. Remember to be creative and innovative when selecting a topic and have fun exploring the exciting world of biology!

Selecting the best Biology IA topic can be a challenging task. However, by considering your interests, strengths, feasibility, and the potential research questions, you can choose a topic that aligns with your passions and capabilities. By using the resources available through the IB writing service , you can learn valuable writing skills and improve your overall academic performance.

This article provided some Biology IA topics that students can consider and some tips on how to choose the best topic for their research. By following these tips and exploring different topic ideas, students can conduct a successful Biology IA project that showcases their scientific knowledge and research skills.

Nick Radlinsky

Nick Radlinsky is a devoted educator, marketing specialist, and management expert with more than 15 years of experience in the education sector. After obtaining his business degree in 2016, Nick embarked on a quest to achieve his PhD, driven by his commitment to enhancing education for students worldwide. His vast experience, starting in 2008, has established him as a reputable authority in the field.

Nick's article, featured in Routledge's " Entrepreneurship in Central and Eastern Europe: Development through Internationalization ," highlights his sharp insights and unwavering dedication to advancing the educational landscape. Inspired by his personal motto, "Make education better," Nick's mission is to streamline students' lives and foster efficient learning. His inventive ideas and leadership have contributed to the transformation of numerous educational experiences, distinguishing him as a true innovator in his field.

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Guide for Students to the IB Biology IA Format

A fresh pair of eyes can catch mistakes you may have missed in IB Biology IA.

Ah, the allure of the International Baccalaureate (IB) ! While involved with IB, I’ve noticed that mastering the IB Biology IA is no small feat. However, it’s not as intimidating as it might seem at first. This article reviews the essential IB Biology IA format and structure, sprinkled with insights from my years of experience.

When I first encountered the IB Biology IA, I was a tad overwhelmed. Yet, as I explored more, I realized its fundamental importance. So, what exactly is the IB Biology IA? It’s a key assessment piece for IB students that evaluates their experimental and investigative skills. Furthermore, proper format and structure can significantly impact your final grade. From my experience, laying a solid foundation is vital for success.

Critical Components of the IB Biology IA Format

The IA is a laboratory report that is an integral part of the IB Biology curriculum. For assessments through May 2025, this 6-12 page work should include a research question, detailed methodology, data interpretation, and a concluding section.

But to understand the intricacies of the IB Biology IA, we need to peel back the layers. In my years of experience, getting a grip on these elements has often been the turning point for many students.

So, understanding and perfecting these sections is instrumental in crafting a standout IB Biology IA . And believe me, with the right approach, it’s more than achievable!

Title Page and Research Question

The beginning is often the most crucial. Just as a book is judged by its cover, your IA begins its impression with the title page. It should be sharp and concise but comprehensive enough to provide an inkling of the direction of your investigation. Alongside, the research question is the backbone of your research, guiding every step. It’s paramount for it to be precise and well-defined, illuminating the research path for the reader. By the way, you can read more about the IB Internal Assessment format in our blog.

Introduction and Background

It is where you roll out the context, much like a red carpet for what follows. This section offers the essential backdrop, helping readers grasp the significance of your study. Going by the general IB criteria, it’s pivotal to elucidate the relevance and importance of your chosen topic here, providing a solid rationale for its investigation.

Personal Engagement and Exploration

This section is truly a window to your academic soul. It reveals your genuine interest, passion, and personal connection to the IB Biology topic . It’s a space to articulate why this particular topic resonated with you. Over the years, I’ve discerned that students who showcase genuine enthusiasm and curiosity here tend to elevate their IAs to a new level.

Methods and Materials

Venturing into the practical realm is where you lay out your experimental master plan. Document every apparatus, tool, and step taken during your research. The idea is to draft this section with such clarity and precision that anyone reading it could replicate your experiment seamlessly.

So, the “Methods and Materials” section stands as your guidepost, shedding light on your experimental process. Here is an example of a step-by-step procedure:

Preliminary Setup . Always start with how you prepared the lab space, ensuring all equipment was clean, sterile (if necessary), and within easy reach.
Experiment Initiation . It could be preparing a solution, calibrating an instrument, or setting up the apparatus.
Data Collection Phase . Describe in detail how you collected data, at what intervals, and using which tools. For example, “Using a calibrated pipette, I extracted 5ml of the solution every 10 minutes.”
Safety Measures . Always document any safety protocols followed during the experiment, such as ensuring adequate ventilation or handling chemicals carefully.
Experiment Conclusion . Detail how you wrapped up the experiment . It could include turning off equipment, safely disposing of materials, or storing data.
Post-Experiment Cleanup . It is always a vital step to indicate how you restored the lab space to its original condition and how you stored or disposed of used materials.

The aim is to write this section thoroughly so that another student, perhaps halfway across the world, could read your description and carry out the same experiment with identical results. Clarity and meticulousness can raise your IA to a commendable standard.

With the right approach, the path to an impressive IB Biology IA becomes clearer.

Data Collection and Analysis

Ah, the realm of empirical evidence! As I’ve often reiterated in my interactions, this section forms the core of your IA. It’s where your observations and findings come alive. But numbers alone won’t suffice. Getting into analysis, identifying patterns, and drawing insightful conclusions is crucial. Precision and accuracy are the linchpins here.

Conclusion and Evaluation

This segment calls for introspection and a broad overview as we round off. Draw overarching inferences from your research, going beyond just stating the results. Understand the broader implications of your findings. Moreover, put on your critic’s glasses, judiciously assessing your study’s strengths while acknowledging its weaknesses.

Topics to Read:

Understanding the IB Curriculum: A Beginner’s Guide
Guide to the Official IBO Website for IB Student Advantages and Growth
How to Manage Time Effectively as an IB Student
How to Write a Strong IB IA Proposal?
The Benefits of Pursuing the IB Diploma Programme
What to Do if You Don’t Pass Your IB IA? How to Succeed Next Time?
Can I Order IB Internal Assessment Written Online?

Tips for Excelling in Your IB Biology IA

The path to mastering the IB Biology IA can be challenging, but it can be a smooth ride with a few strategic pointers. Having been deeply involved with the IB for years, I’ve collected vital insights that can distinguish between a satisfactory and a stellar IA . Let’s get right into them.

1. Selecting a Relevant Research Question

The foundation of your entire IA is your research question. What’s the secret sauce to crafting the perfect one? It’s all about relevance. Ensure that your question aligns neatly with the biology syllabus.

From my numerous sessions and interactions, a research question that resonates well with the core curriculum often garners more appreciation. Finding that sweet spot between ambition and practicality is also pivotal. While aiming high is commendable, choosing a feasible question within your means and resources is crucial.

2. Prioritizing Accurate Data Collection

Data is the heartbeat of your IA. Precise collection is non-negotiable. Here’s a valuable piece of advice I’ve echoed throughout my years — always double, if not triple, check your data. A minor mistake can alter your results significantly. Consistency is vital in this aspect. Make sure your data collection methods are systematic, repeatable, and free of any biases.

3. Emphasizing Personal Engagement

It is where your unique touch makes a difference. The IA isn’t just about presenting facts but also about your connection and enthusiasm for the topic. Standout IAs often have a strong undercurrent of genuine interest and dedication. From my vast experience, when students infuse their work with sincere passion, it shines through, making the IA genuinely memorable:

Initial Curiosity . Begin by shedding light on what piqued your interest in the topic.
Challenges and Overcoming Them . Maybe you faced difficulty sourcing materials or grappled with a particular concept.
Moments of Eureka . Highlight instances during your research when things clicked, or you experienced breakthrough moments.
Personal Stories . You may have always been fascinated by plant biology because you used to garden with a family member, or perhaps a unique health challenge drove your interest in human biology.
Reflections . Share your introspective moments. How has this research changed or deepened your understanding of the topic? How has it influenced your perspective or future aspirations in biology?

Remember, the personal engagement section is your canvas. It’s an opportunity to paint a picture of the researcher and the individual behind the research. By emphasizing these elements, you elevate the depth of your IA and create a resonant narrative that reviewers and readers can connect with.

4. Reflection and Evaluation of Your Findings

After all the rigorous work, it’s essential to pause and reflect. It involves not merely stating your results but also pondering their significance. How do your findings fit into the larger framework of biological understanding? Additionally, always be ready to assess your work critically. Pinpoint areas of improvement and suggest potential refinements. Such a holistic perspective adds depth to your IA and showcases your understanding and maturity.

Don’t let the stress of choosing an IA topic hold you back.

Are you struggling to come up with topic suggestions for your IB Internal Assessment?

Our experienced writers can help you choose the perfect topic for your IA

Tailored to your specific subject and requirements.

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Common Mistakes to Avoid in IB Biology IA Structure

Over the years, I’ve seen students make the same mistakes. Let’s ensure you’re not one of them!

1. Skipping Peer Review and Feedback

In the thick of research and writing, it’s easy to become myopic and miss out on tiny errors or areas of improvement. That’s where a second set of eyes becomes invaluable. Peer reviews or feedback from mentors can offer fresh perspectives, identify overlooked mistakes, or even provide insights that can elevate the quality of your work. From my experience, students who embrace feedback often end up with more polished and well-rounded IAs.

2. Inconsistent Data Collection Methods

While the methodology might be sound, inconsistency in data collection can introduce significant errors. Maintaining uniformity throughout the data collection phase is crucial. For instance, if you’re measuring plant growth, ensuring that measurements are taken simultaneously, under the same conditions, can make a difference.

3. Neglecting the Significance of the Research Question

The research question is the north star of your IA. Sometimes, students opt for broad or overly ambitious questions, convoluting the research process. It’s essential to choose a question that’s both relevant and feasible, ensuring that it aligns with the IB Biology syllabus and is achievable within the scope of the IA.

4. Not Justifying Methodological Choices

Simply listing out methods isn’t enough. It’s crucial to explain why a particular way was chosen and its relevance to the research question. Offering a rationale can give depth to the methodology section and showcase a deeper understanding of the research process.

Conclusion: Perfecting Your IB Biology IA

The IB Biology IA format and structure might seem daunting initially, but it becomes manageable with the proper guidance and preparation. I believe that with dedication and focus, every student can succeed in their IB Biology IA. Remember, it’s a marathon, not a sprint.

In conclusion, with the right approach and these strategic tips in your arsenal, the path to creating an impressive IB Biology IA becomes much more straightforward. Combine these insights with dedication, and you’re on your way to success! Here’s wishing you all the very best! And remember, you can always get help with IB Biology IA from our experienced writers.

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6 Ecological ideas for your IA
The Investigation

IA - Investigation ideas

The Individual investigation could be an opening to demonstrate the foolishness of our actions, the simplicity of potential solutions or correlations between causes of ecological damages and their effects. Anyone who cares about conservation of biodiversity, protecting animals from extinction, the Impending world food crisis could further their understanding by completing an IA about one of these global issues. Others might seek solutions to local problems as so much of global action is rooted in the local environment.

Whatever the choice, remember that the Biology IA is a short study and that only one variable can be manipulated in the IA.

Hands-on experiment IA ideas

The effect of an abiotic factor on a single feature of leaf structure

This is an interesting opportunity to investigate form and function in the leaves of plants. There are several features of plant leaves which are easy to see with the naked eye, such as shape and colour. Other features require some kind of measuring tool, for example a colorimeter for pigment composition, or for measuring thickness. There are also features which may be interesting to study with a microscope for example, stomata density, the shape of palisade mesophyll cells, the presence or absence of hairs, or the density of hairs on different parts of the leaf might be interesting. Abiotic factors could be identified and the sites of leaf sampling could be carefully chosen to incorporate control of variables. While this might be difficult there is a lot which can be considered such as amount of water in the soil, light levels, wind speed, etc.

The effect of aphids on a single aspect of plant structure.

Beans and roses grown in a garden often suffer from the presence of aphids. In my garden the aphids are sometimes actually cultivated by ants. Does this herbivory affect any structures on the plant leaves. Do the leaves respond to the presence of the aphids? For example could there be an increase in the thickness of epithelial cells in the leaf, could there be an increase in the density of hairs on the veins of the leaf, alternatively could the presence of leaf hairs on the veins affect the distribution of aphids on the leaves? There are plenty of options in this kind of study but it could only be carried out during the summer / autumn season when leaves have had time to respond.

The effects of aquatic plants on the nitrate content of water.

We know that plants take up nitrates from their roots by diffusion or active transport and that ecological swimming pools can be constructed using plants and gravel instead of filters. However, in high nitrate water the algae can bloom and cause eutrophication. Would other plants cause eutrophication at high nitrate levels, or is it the fact the algae reduce light penetration in the water and thus lead to the death of some of the algae and the growth of bacteria which causes eutrophication? This topic is a rich source of research questions and it is quite easy to test the nitrate (and other ion) content of water. What about experimenting with lettuce plants in a hydroponics system or in a school aquarium?

Data based investigations

Do migratory birds carry diseases to farm animals?

In many countries the occurrence of diseases in farm animals or fisheries is recorded by a national agricultural service. At the same time there are possible causes of the spread of disease, or animal susceptibility to infections. For example, migratory birds could spread disease to free range chicken farms. In this type of study it is important to be selective about the data and to try to control other variables, for example the size of farms, the breed of animals, etc.

Is there evidence of changes in climate could cause changes in agricultural yields?

This could be a study of climate data and harvesting dates in different years, or it could be a consideration of long term trends in harvesting dates. Temperature or rainfall could affect the onset of flowering the size of fruit or the quality of grapes or wine. Climate data, or geographical location of different farms could be used to test for correlations. Industry data is usually recorded in data bases of annual production of food types.

Do conditions of animal husbandry affect the frequency of disease in farm animals?

From time to time there are outbreaks of disease in domestic animals in farms around the world. Foot and mouth disease is one example. Are there any factors of animal husbandry which could increase the risk of outbreaks of such diseases? Data about disease outbreaks is available online and also information about agricultural methods in different countries, or regions. There are other environmental factors linked to regulations and control of hygiene at farmers' markets, or abattoirs.

Former Biology Graduate Student to give Career Development Series Talk

Beth Osia, who earned her Ph.D. in Integrated Biology in 2020 under the mentorship of Anna Malkova , will be giving a Career Development Series talk entitled, “Career Transition as a T32 Postdoc at a Cancer Research and Treatment Center,” on Tuesday, June 25 at 11:30am via Zoom. If interested in attending, email [email protected] for the Zoom link. The Career Development Series talks are hosted by the Holden Comprehensive Cancer Center. See additional details below.

Beth Osia Career Development Series talk on Tuesday, June 25 at 11:30am via Zoom

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COMMENTS

50 IB Biology IA Ideas
In this post, we give you 50 IB Biology IA Ideas to help you speed up your research process. Within each topic listed below, we include the basic reasons for investigating each topic, what the possible independent variables and dependent variables are as well as the basic experimental setup! Remember!
IB Biology IA: 60 Examples and Guidance
The IA consists of a laboratory report that students must complete during their IB biology course. For assessments before May 2025, the report should be 6 to 12 pages in length and should include a research question, a methodology section, data analysis, and a conclusion. From May 2025, the report should be a maximum of 3,000 words.
IB Biology IA Ideas (30+ Topics)
Discover 30+ Game-changing IB Biology IA Ideas & Ace Your Bio IA With Flying Colors! Learn From Experts & Nail IB Today! Sell your IB Docs (IA, EE, TOK, etc.) for $10 a pop! ... Your Research Question and the Aim of the Investigation are separate sub-headings with different implications. Keep the research question brief and relevant.
IB Biology IA examples
All Biology IA Examples. Starting from the May 2025 session, the Biology IA requirements have changed. We created a couple of exemplars to show you how the new IA should look like. It's OK to refer to the old Biology IA exemplars (since the new IA is quite similar) for inspiration/ideas, but make sure to follow the new requirements.
30 Biology IA Topic Ideas!
21, The effect of temperature / light on fruit ripening. 22, Exploring stomatal density in a variety of conditions. 23, Testing the effectiveness of toothpaste types. 24, Investigating the effect of smoke water on the germination and growth of E.pilularis. 25, Exploring the effect of sunlight on biomass.
Biology IA Checklist 2022: Step by Step Guide for a Perfect IA
The International Baccalaureate Biology Internal Assessment makes up 20% of the final grade achieved by Biology HL and Biology SL students. Therefore, it's super important that your IB Biology IA gets as high a mark as possible. In this post, we outline the different necessary components. This checklist discusses the following assessment ...
More than 30 IB Biology IA Topic Ideas To Use
An important part of the International Baccalaureate (IB) Biology program is the Internal Assessment (IA). It encourages students to think critically, do original research, and use what they've learned in practical contexts. Yet, deciding on a subject for the IA might be challenging. This article provides a list of 30 potential topics for an IA in IB Biology.
Biology IA Topics: 20+ Great Ideas to Get You Started
IB Biology Internal Assessment (IA) Topics. Coming up with an IB Biology IA topic to explore isn't difficult if you understand the requirements. Like Physics and Chemistry, your IA in Biology must focus on scientific writing and research in the Biology subject. Below is a list of 30+ topic ideas for Biology Internal Assessment:
IB Biology Internal Assessment Solved: A Guide to Acing Your Biology IA
The Biology Internal Assessment (IA) is a take home report on a research question of your choice. It is worth 20% of your final grade and thus it is important to perform well in it. The Biology IA can be daunting. It has a 16-page limit, which might seem like a lot to do, but towards the end of the IA you'll be wishing you had more pages to ...
12 Examples and Tips for IB Biology IA
2. Examples of Biology IA Topics. Many IB graduates have kindly answered an online survey by MakeSensei and given examples of IA topics in IB Biology. Some of them are RQs (Research Questions), so you might want to see the pattern of how they make RQs for your future IA. 2.1 For HL
DP Biology: IA ideas during a pandemic 2020-21
The Investigation. IA ideas during a pandemic 2020-21. The academic year from 2020 to 2021 has been challenging for everyone and challenge brings innovation. Many students have found themselves at home trying to do their IAs with limited access to equipment and support only be video call with their teacher.
25 Unique Biology IA Ideas
A good IA does not have to be a very complex and intricate piece of work. A clear research question, consistent structure, and clear personal engagement which demonstrates knowledge will earn the student a good grade. So let's jump into what you are here for. Here is a list of 25 possible topics that serve as great biology IA ideas. To keep ...
How to Write a Top Tier Biology IA (With Examples)
The IA, at a glance. The Internal Assessment, or IA, is a mandatory assignment of all IB students. It consists of a piece of written coursework that is assessed internally by a teacher, as well as externally moderated by the IB themselves. The IA accounts for 20% of a student's final assessment, and should involve roughly 10 hours of teaching ...
50 IB Biology IA Topic Ideas for Students
The IA involves the submission of a lab report by students as part of their IB biology curriculum. Until May 2025, the report must be between 6 and 12 pages, encompassing a research question, methodology, data analysis, and a conclusion. Starting from May 2025, the report's length will be capped at 3,000 words.
Biology IA topics
Biology IA topics. Biology Internal Assessment is a crucial component of the International Baccalaureate Biology course, and it requires students to conduct independent research on a topic of their choice. This task aims to assess students' understanding of scientific research and their ability to apply scientific concepts and principles to a ...
IA Exploration
Internal Assessment Exploration. Click for a printable summary of IB internal assessment requirements. This criterion assesses the extent to which the student establishes the scientific context for the work, states a clear and focused research question and uses concepts and techniques appropriate to the Diploma Programme level to design an ...
Ace Your Biology IA (HL): A How-to Guide
The Higher Level (HL) Biology Internal Assessment (IA) is a crucial component of the International Baccalaureate (IB) program. It allows students to delve deep into a scientific topic of their choice and showcase their research and analytical skills. In this guide, we will focus on the preliminary pages of the Biology IA, specifically the Title.
IA Research Design
Internal Assessment Research Design. This criterion assesses the extent to which the student effectively communicates the methodology (purpose and practice) used to address the research question. Click for the summary of IB internal assessment requirements. Click for a printable score sheet. Command terms indicate the depth of treatment ...
IB Biology IA Format: Everything IB Students Need to Know
The IA is a laboratory report that is an integral part of the IB Biology curriculum. For assessments through May 2025, this 6-12 page work should include a research question, detailed methodology, data interpretation, and a concluding section. But to understand the intricacies of the IB Biology IA, we need to peel back the layers.
DP Biology: IA
Worksheet for Activity 1 - Avoid a vague research question. Spending ten minutes getting the research question right is time well spent at the beginning of an IA. The first question (below) is not fully focused, the student knows what they want to do but they haven't expressed it precisely.
DP Biology: How simple could an IA research question be?
An experiment which is too simple could not have a 4 mark conclusion "relevant to the research question" but it might have a good comparison to theory mark, and also for the strengths weaknesses and improvement suggestions. So evaluations marks would be less affected. Lets be generous and say 5 marks is possible.
IB Biology
Methodology: Manipulation and Control of the Variables. All materials are clearly listed with details (type, amount, size, volume, concentration…) Diagrams and/or photographs clearly showing the setup of apparatus is included. Diagrams and photographs are referenced using MLA standards. How the independent variable was manipulated is clearly ...
DP Biology: 6 Ecological ideas for your IA
Three ways to choose a topic for the IA; Exploration. Focusing a research question; Analysis. IA Analysis - ANOVA or t-test? Evaluation; Communication; IA - Avoiding common errors. IA avoiding common errors - model answers; 30 investigation ideas for Biology IA. Investigating strawberries with a glucose test meter; IA Experiments that could be ...
Former Biology Graduate Student to give Career Development Series Talk
149 Biology Building (BB) 129 E. Jefferson Street Iowa City, IA 52242-1324. 319-335-1050 319-335-1069 [email protected]