case study on reproduction in animals class 8

Case Study Questions Class 8 Science Reproduction in Animals

Case study questions class 8 science chapter 8 reproduction in animals, cbse case study questions class 8 science reproduction in animals, case study 1.

Do you recall the processes ofdigestion, circulation andrespiration which you havestudied in your previous classes? Theseprocesses are essential for the survivalof every individual. You have also learntabout the process of reproduction inplants. Reproduction is essential for thecontinuation of a species. Imagine whatwould have happened if organisms hadnot reproduced. You will realise thatreproduction is very important as itensures the continuation of similarkinds of individuals, generation aftergeneration.Modes of Reproduction:Have you seen the young onesof different animals? Try to name someof the young ones by completing shown in examples at S. No.1 and 5.You must have seen the youngones of various animals being born.Can you tell how chicks andcaterpillars are born? How are kittensand puppies born? Do you think thatthese young ones looked the samebefore they were born as they do now?Let us find out.Just as in plants, there are two modesby which animals reproduce. These are:(i) Sexual reproduction, and(ii) Asexual reproduction.Sexual ReproductionTry to recall reproduction in plantswhich you studied in Class VII. You willremember that plants that reproducesexually have male and femalereproductive parts. Can you name theseparts? In animals also, males andfemales have different reproductive partsor organs. Like plants, the reproductiveparts in animals also produce gametesthat fuse to form a zygote. It is the zygotewhich develops into a new individual.This type of reproduction beginningfrom the fusion of male and femalegametes is called sexual reproduction.Let us find out the reproductive partsin humans and study the process ofreproduction in them.

Case study 2

Que. 3) (d) in vitro fertilisation

Case study 3

Case study 4.

Que. 5) Answer: Cloning is the production of the exact copy of the cell, any other living part or a complete organism. The first successfully cloned animal is a sheep named Dolly.

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Case Study Questions for Class 8 Science Chapter 9 Reproduction in Animals

• Last modified on: 1 year ago
• Reading Time: 4 Minutes

Here we are providing case study questions for CBSE Class 8 Science Chapter 9 Reproduction in Animals.

Case Study Questions

Question 1:

Read the passage carefully and answer the questions that follow-

For the continuity of life, all living things produce organisms of their own kind. This is called reproduction. A special organ system called the reproductive system is responsible for carrying out the process of reproduction in a living body. Although all living things reproduce they do so by different means. There are two types of Reproduction-Asexual and Sexual reproduction. Asexual reproduction requires one parent while Sexual reproduction requires two parents to produce a baby. Asexual reproduction is the simplest form of reproduction and is commonly found in plants and lower animals like starfish, sponges and worms. Most plants and mammals, including human beings, reproduce sexually.

a) What is reproduction? i) Producing fruits ii) Producing young ones of its own kind iii) Producing food iv) All of these

b) What are the two types of reproduction? i) Budding ii) Fragmentation iii) Asexual reproduction iv) Sexual reproduction a. i) b. ii) c. ii&iv d. iii &iv

c) Which type of reproduction involves only one parent? i) Sexual reproduction ii) Asexual reproduction iii) Both of these iv) None of these

d) How do mammals reproduce? i) By sexual reproduction ii) By asexual reproduction iii) By budding iv) All of these

e)Identify the organism which reproduces asexually. i) Shark ii) Sponges iii) Snake iv) Snail

b) iii & iv (Option c)

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• Reproduction in Animals Class 8 Case Study Questions Science Chapter 6

Last Updated on April 21, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 8 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 8 science. In this article, you will find case study questions for cbse class 8 science chapter 6 Reproduction in Animals.

Table of Contents

Case Study Questions on Reproduction in Animals

Question 1:

Read the given passage below and answer the question:

All plants and animals go through life cycles. Just think about all the growing and changing human children do as they grow up. Children grow in height and get heavier until they reach adulthood. Children also change as their body matures. Although we grow lots from the time we are born to adulthood, humans never transform. Unlike us, butterflies go through a metamorphosis, or transformation. A butterfly looks very different as it changes through all four stages of its life cycle. A butterfly transforms through the first stage egg to the last stage adult butterfly. Similarly, frogs go through the same transformation from egg to an adult.

Q. 1. Frog and butterfly comes under: (a) Oviparous animals (b) Viviparous animals (c) Ovoviviparous (d) None of the above

Difficulty Level: Easy

Ans. Option (a) is correct. Explanation: Animals lay eggs which later develop into young ones. They are called oviparous animals. So, it is easier to observe the eggs of oviparous animals as they are outside the body.

Q. 2. What is another name of the pupa stage of butterfly? (a) Caterpillar (b) Adult (c) Chrysalis (d) None of the above.

Ans. Option(c) is correct. Explanation: The transformation of a caterpillar (larva) to a butterfly takes place in the chrysalis (pupa). Butterflies go through a life cycle of 4 stages: egg, larva, pupa and an adult.

Q.3. Define the term metamorphosis.

Difficulty Level: Medium

Ans. The process of transformation of a larva to an adult through a series of drastic changes, for example, frog, silkworm, butterfly, etc., undergo metamorphosis.

Q. 4. What are the stages of life cycle of a frog? (Medium)

Ans. Unlike mammals, frogs lay eggs. To increase the chances of survival, many eggs are laid in masses by the frog. Frog eggs can usually be found in calm or static waters. Stages of life cycle of a frog are: Egg → Tadpole → Froglet (young frog) → Adult frog.

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Topics from which case study questions may be asked.

• Learning the modes of reproduction in animals.
• Learning process of asexual reproduction in microscopic organisms.
• Knowing various parts of the male and female reproductive system.
• Understanding the process of sexual reproduction.
• Understanding the process of fertilisation and development of embryo.
• Discussing the difference between viviparous and oviparous animals.

The process through which living beings produce new young ones of their own kind is called reproduction. Reproduction is necessary for the continuation of species, the transfer of variations from one generation to another and also for the addition of new species. This chapter deals with reproductive systems and various modes of reproduction in animals.

Frequently Asked Questions (FAQs) on Reproduction in Animals Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 8 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of reproduction in animals, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 8 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our  website  to access these questions and enhance your learning experience.

Q5: How can students effectively prepare for case study questions on reproduction in animals for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on Reproduction in Animals class 8 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of reproduction in animals.

Q7: Which is the largest cell and smallest cell in the human body?

A7: Human reproductive system contains the largest cell (ovum) and smallest cell (sperm) in the human body.

Q8: Why the gametes have only half the number of chromosomes?

A8: Gametes are produced as a result of meiosis. In meiosis, a single cell divides into four haploid cells. The numbers of chromosomes are halved in meiosis and produces haploid gametes. Thus, the gametes have only half the number of chromosomes.

Q9: Define the term cloning.

A9: An artificial method invented by human beings to produce organ cell or part of living organisms without sexual or asexual reproduction. For example, sheep named Dolly was a clone.

Q10: Name the primary male and female sex hormones

A10: Testosterone is the primary male sex hormone produced by the testes and Estrogen or oestrogen is the primary female sex hormone secreted by ovaries.

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Case Study Based Questions: Reproduction in Animals | Science Class 8 PDF Download

Case Study 1

Do you recall the processes of digestion, circulation and respiration which you have studied in your previous classes? These processes are essential for the survival of every individual. You have also learnt about the process of reproduction in plants. Reproduction is essential for the continuation of a species. Imagine what would have happened if organisms had not reproduced. You will realise that reproduction is very important as it ensures the continuation of similar kinds of individuals, generation after generation. Modes of Reproduction: Have you seen the young ones of different animals? Try to name some of the young ones by completing shown in examples at S. No.1 and 5.You must have seen the young ones of various animals being born. Can you tell how chicks and caterpillars are born? How are kittens and puppies born? Do you think that these young ones looked the same before they were born as they do now? Let us find out. Just as in plants, there are two modes by which animals reproduce. These are: (i) Sexual reproduction, and(ii) Asexual reproduction. Sexual Reproduction Try to recall reproduction in plants which you studied in Class VII. You will remember that plants that reproduce sexually have male and female reproductive parts. Can you name these parts? In animals also, males and females have different reproductive parts or organs. Like plants, the reproductive parts in animals also produce gametes that fuse to form a zygote. It is the zygote which develops into a new individual. This type of reproduction beginning from the fusion of male and female gametes is called sexual reproduction. Let us find out the reproductive parts in humans and study the process of reproduction in them.

Q1: Reproduction is essential for the continuation of a …………………... (a) Genus (b) Species (c) Breed (d) Group Ans: (b)

Q2: Which among the following is the correct option stating the young one of a butterfly? (a) Caterpillar (b) Calf (c) Moth (d) Chick Ans: (a)

Q3: Calf is the young one of which of the following animals given below? (a) Human (b) Frog (c) Hen (d) Cow Ans: (d)

Q4: Explain in detail the term “sexual reproduction” in animals. Ans: In sexual reproduction, the reproductive parts of animals produce gametes (sperm and egg) that fuse to form a zygote. This fusion process is called fertilization. The zygote then develops into a new individual, inheriting genetic material from both parents, which leads to genetic diversity in the offspring.

Q5: Name the two modes of reproduction in animals. Ans: The two modes of reproduction in animals are: (i) Sexual reproduction (ii) Asexual reproduction

Case Study 2

Male Reproductive Organs: The male reproductive organs include a pair of testes (singular, testis), two sperm ducts and a penis. The testes produce the male gametes called sperms. Millions of sperms are produced by the testes. Though sperms are very small in size, each has a head, a middle piece and a tail. Does it appear to be a single cell? Indeed, each sperm is a single cell with all the usual cell components. Female Reproductive Organs: The female reproductive organs are a pair of ovaries, oviducts (fallopian tubes) and the uterus. The ovary produces female gametes called ova (eggs). In human beings, a single matured egg is released into the oviduct by one of the ovaries every month. Uterus is the part where development of the baby takes place. Like the sperm, an egg is also a single cell. Fertilisation: The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilisation. During fertilisation, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilised egg or zygote. Did you know that the zygote is the beginning of a new individual? The process of fertilisation is the meeting of an egg cell from the mother and a sperm cell from the father. So, the new individual inherits some characteristics from the mother and some from the father. Look at your brother or sister. See if you can recognise some characters in them similar to those of your mother or your father. Fertilisation which takes place inside the female body is called internal fertilisation. Internal fertilisation occurs in many animals including humans, cows, dogs and hens. Boojho and Paheli’s teacher once told them in the class that in some women oviducts are blocked. These women are unable to bear babies because sperms cannot reach the egg for fertilisation. In such cases, doctors collect freshly released egg ands perms and keep them together for a few hours for IVF or in vitro fertilisation (fertilisation outside the body). In case fertilisation occurs, the zygote is allowed to develop for about a week and then it is placed in the mother’s uterus. Complete development takes place in the uterus and the baby is born like any other baby. Babies born through this technique are called test-tube babies. This term is actually misleading because babies cannot grow in test tubes. You will be surprised to know that in many animals’ fertilisation takes place outside the body of the female. In these animals, fertilisation takes place in water. Let us find out how this happens. During spring or rainy season, frogs and toads move to ponds and slow-flowing streams. When the male and female come together in water, the female lays hundreds of eggs. Unlike hen’s egg, frog’s egg is not covered by a shell and it is comparatively very delicate. A layer of jelly holds the eggs together and provides protection to the eggs. As the eggs are laid, the male deposits sperms over them. Each sperm swims randomly in water with the help of its long tail. The sperms come in contact with the eggs. This results in fertilisation. This type of fertilisation in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilisation. It is very common in aquatic animals such as fish, starfish, etc.

Q1: Which of the following is NOT a part of the female reproductive system? (a) Fallopian tube (b) Ovaries (c) Testes (d) Uterus Ans: (c)

Q2: The type of fertilization in which the fusion of male and female gametes takes place outside the body is called ………………………... (a) Internal fertilization (b) External fertilization (c) Systemic fertilization (d) Directional fertilization Ans: (b)

Q3: Which among the following is the correct full form of IVF? (a) In voluntary fertilization (b) Inter vesicular fistula (c) Intra venous fertilization (d) In vitro fertilization Ans: (d)

Q4: Define the process of fertilization in detail. Ans: When sperm comes in contact with the egg, one of the sperm fuses with the egg to form a zygote; this process is called fertilization. The nuclei of the sperm from the male and the nuclei of the ovum from the female fuse to form a single fertilized egg or zygote.

Q5: What are test tube babies? Ans: Test tube babies are those conceived through in vitro fertilization (IVF). In this process, eggs and sperm are collected from the parents and are kept together in a laboratory setting for fertilization. Once fertilization occurs, the resulting zygote is allowed to develop for a few days and then is placed in the mother's uterus, where it can grow into a baby.

Case Study 3

How could a single cell become such a big individual? Development of Embryo: Fertilisation results in the formation of zygote which begins to develop into an embryo. The zygote divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is termed an embryo. The embryo gets embedded in the wall of the uterus for further development. The embryo continues to develop in the uterus. It gradually develops body parts such as hands, legs, head, eyes, ears etc. The stage of the embryo in which all the body parts can be identified is called a foetus. When the development of the foetus is complete, the mother gives birth to the baby. Internal fertilisation takes place in hens also. But, do hens give birth to babies like human beings and cows? You know that they do not. Then, how are chicks born? Let us find out. Soon after fertilisation, the zygote divides repeatedly and travels down the oviduct. As it travels down, many protective layers are formed around it. The hard shell that you see in a hen’s egg is one such protective layer. After the hard shell is formed around the developing embryo, the hen finallylays the egg. The embryo takes about 3weeks to develop into a chick. You must have seen the hen sitting on the eggs to provide sufficient warmth. Did you know that development of the chick takes place inside the egg shell during this period? After the chick is completely developed it bursts open the egg shell. In animals which undergo external fertilisation, development of the embryo takes place outside the female body. The embryos continue to grow within their egg coverings. After the embryos develop, the eggs hatch. You must have seen numerous tadpoles swimming in ponds and streams. Viviparous and Oviparous Animals: We have learnt that some animals give birth to young ones while some animals lay eggs which later develop into young ones. The animals which give birth to young ones are called viviparous animals. Those animals which lay eggs are called oviparous animals. The following activity will help you understand better and differentiate between viviparous and oviparous animals. The eggs of a few animals are easy to observe because their mothers lay them outside their bodies. These are examples of oviparous animals. But you would not be able to collect the eggs of a dog, cow or cat. This is because they do not lay eggs. The mother gives birth to the young ones. These are examples of viviparous animals. Young Ones to Adults: The new individuals which are born or hatched from the eggs continue to grow till they become adults. In some animals, the young ones may look very different from the adults. Recall the lifecycle of the silkworm (egg → larva or caterpillar → pupa → adult) you studied in Class VII. Frog is another such example. Observe the different stages of frog starting from the egg to the adult stage. We find that there are three distinct stages, that is, egg → tadpole (larva) →adult. Don’t the tadpoles look so different from the adults? Can you imagine that these tadpoles would someday become frogs? Similarly, the caterpillar or the pupa of silkworm looks very different from the adult moth. The features that are present in the adult are not found in these young ones. Then what happens to the tadpoles or caterpillars there after? You must have seen a beautiful mothemerging out of the cocoon. In the case of tadpoles, they transform into adults capable of jumping and swimming. The transformation of the larva into an adult through drastic changes is called metamorphosis. What about the changes that we observe in our body as we grow? Do you think we too under gometamorphosis? In human beings, body parts similar to those present in the adults are present from the time of birth.

Q1: The developing zygote called the embryo gets embedded in which part of the female reproductive system? (a) Oviduct (b) Wall of uterus (c) Cervix (d) Ovary Ans: (b)

Q2: Complete the missing stage in the life cycle of silkworm: egg→ larva or caterpillar→ ……………. →Adult (a) Pupa (b) Moth (c) Tadpole (d) Nymph Ans: (a)

Q3: Which among the following is NOT an example of viviparous animals? (a) Monkey (b) Cow (c) Dog (d) Frog Ans: (d)

Q4: Define the term “metamorphosis”. Ans: Metamorphosis is the transformation of a larva into an adult through a series of drastic changes in form and structure. This process is common in insects and amphibians.

Q5: What do you mean by oviparous animals? Give one example. Ans: Oviparous animals are those that lay eggs, with the embryo developing and hatching outside the mother's body. An example of an oviparous animal is a chicken.

Case Study 4

Asexual Reproduction: So far, we have learnt about reproduction in some familiar animals. But what about very small animals like hydra and microscopic organisms like amoeba? Do you know how they reproduce? Let us find out. In each hydra, there may be one or more bulges. These bulges are the developing new individuals and they are called buds. Recall the presence of buds in yeast. In hydra too the new individuals develop as outgrowths from a single parent. This type of reproduction in which only a single parent is involved is called asexual reproduction. Since new individuals develop from the buds in hydra, this type of asexual reproduction is called budding. Another method of a sexual reproduction is observed in the microscopic organism, amoeba. Let us see how this happens. You have already learnt about the structure of amoeba. You will recall that amoeba is a single-celled organism. It begins the process of reproduction by the division of its nucleus into two nuclei. This is followed by division of its body into two, each part receiving a nucleus. Finally, two amoebae are produced from one parent amoeba. This type of asexual reproduction in which an animal reproduces by dividing into two individuals is called binary fission. Apart from budding and binary fission, there are other methods by which a single parent reproduces young ones. You will study about these in your higher classes. Story of Dolly, the Clone: Cloning is the production of an exact copy of a cell, any other living part, or a complete organism. Cloning of an animal was successfully performed for the first time by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh, Scotland. They successfully cloned a sheep named Dolly. Dolly was born on 5th July 1996 and was the first mammal to be cloned. During the process of cloning Dolly, a cell was collected from the mammary gland of a female Finn Dorsett sheep. Simultaneously, an egg was obtained from a Scottish blackface ewe. The nucleus was removed from the egg. Then, the nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed. The egg thus produced was implanted into the Scottish blackface ewe. Development of this egg followed normally and finally Dolly was born. Though Dolly was given birth by the Scottish blackface ewe, it was found to be absolutely identical to the Finn Dorsett sheep from which the nucleus was taken. Since the nucleus from the egg of the Scottish blackface ewe was removed, Dolly did not show any character of the Scottish blackface ewe. Dolly was a healthy clone of the Finn Dorsett sheep and produced several offspring of her own through normal sexual means. Unfortunately, Dolly died on 14th February 2003 due to a certain lung disease. Since Dolly, several attempts have been made to produce cloned mammals. However, many die before birth or die soon after birth. The cloned animals are many-a-times found to be born with severe abnormalities.

Q1: The process in which the bulges in the body of Hydra called the buds develop into a new individual is called ………………………………. (a) Binary fission (b) Bulbs (c) Budding (d) Budging Ans: (c)

Q2: Dolly was a healthy clone of which of the following sheep? (a) Finn Dorsett sheep (b) Scottish blackface ewe (c) Suffolk (d) Cheviot Ans: (a)

Q3: In which of the following year did Ian Wilmut successfully clone a sheep named Dolly? (a) 1996 (b) 1997 (c) 2003 (d) 1995 Ans: (a)

Q4: Define the process of “asexual reproduction”. Ans: The type of reproduction in which only a single parent is involved is known as asexual reproduction. Budding is one of the examples of asexual reproduction.

Q5: What is the process of cloning? Ans: Cloning is the process of producing an exact genetic copy of a cell, living part, or a complete organism. The first successfully cloned animal was a sheep named Dolly, who was created by Ian Wilmut in 1996.

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Reproduction in Animals Class 8 Notes CBSE Science Chapter 9 (Free PDF Download)

• Revision Notes
• Chapter 9 Reproduction In Animals

Reproduction in Animals Chapter 9 Science Notes (CBSE Class 8) - Revision Notes

Reproduction in Animals Chapter 9 Science Notes are presented here for the students of CBSE Class 8 which will help them in their Science Exam preparation. A free pdf of the revision notes is shared in this article you can download them anytime and use them for future purposes as well.

The experts at Vedantu have prepared the Class 8 Science Chapter 9 notes after a detailed study of the chapter. The notes are a ready reckoner for students and help them in securing good grades in the exams. Download and study them to score good marks in your CBSE Class 8 Science exam. 

Download CBSE Class 8 Science Revision Notes 2024-25 PDF

Also, check CBSE Class 8 Science revision notes for other chapters:

Access Class 8 Science Chapter 9 –Reproduction in Animals Notes in

Reproduction and its importance:.

It is a process by which the organisms produce new offspring of their own species. Reproduction is important for the existence of a species. 

Modes of Reproduction:

The modes of reproduction are based on the requirements of the number of parents, which are: 

(1) Sexual Reproduction

(2) Asexual Reproduction 

1. Sexual Reproduction 

In sexual reproduction, the species consist of male and female reproductive organs. The kind of reproduction in which the fusion of male and female gametes takes place is called sexual reproduction.

Organs for Reproduction:

The female reproductive organs include ovaries, oviducts, and uterus whereas the reproductive organs in the male include testes, sperm ducts, and penis. The ovary produces female gametes called ova (egg cells) and the testes produce male gametes called sperms. 

The fusion of these gametes (ovum and sperm) is called fertilization. The egg developed after fertilization is called a zygote.

Types of Fertilization:

The fertilization can occur inside or outside the parent body, so it is divided into two types:

(a) Internal Fertilization :

The fertilization taking place inside the body of female species is called internal fertilization. This phenomenon is observed in human beings and other animals, for example, hens, cats, dogs, and other mammals. 

(b) External Fertilization:

The fertilization taking place outside the body of the female species is called external fertilization. This is generally observed in aquatic animals such as frogs, fish, etc.

Process of Fertilization:

After fertilization, a zygote is formed, which begins to develop into an embryo. The zygote divides itself repeatedly which results in an embryo, which then gets embedded in the wall of the uterus and develops into body parts.  The stage when the embryo develops well-defined body parts is called the foetus.

Viviparous Animals:

Organisms such as humans, cats, cows, and other mammals which give birth to young ones are called viviparous animals.

Oviparous Animals: 

Egg-laying animals are called oviparous animals, e.g., frogs, lizards, butterflies, etc.

In metamorphosis, the larva is transformed into an adult. It is not observed in humans but it is observed in insects like butterflies, silkworms, frogs, etc.

2. Asexual Reproduction 

This is the type of reproduction in which only a single parent is required. Such a type of reproduction is called asexual reproduction. Species like hydra, amoeba, and other microscopic unicellular organisms.

(a) Budding :

In hydra, new individuals develop from buds formed from the parent body. This method of asexual reproduction by forming buds is called budding.

(b) Binary Fission :

When an organism reproduces by dividing itself into two from a single parent, this type of asexual reproduction is called binary fission. For example, microscopic organisms like amoeba reproduce by dividing themselves into two. In this method the organism divides its nucleus into two parts, thus each part contains a nucleus. 

Revision Notes for Class 8 Chapter 9 - Download PDF

Reproduction in animals class 8 notes have been curated by experts in the subject who have carefully included all important concepts in a point format in these notes. Not only are these notes easy to read and understand, but the language used is also simple and can be retained by the students. Students can breeze through these notes and memorize all the terms and examples that have been used in the chapter. Class 8 Science Chapter 9 notes work as a useful aid at the time of the exams when students need a summary of the chapter to help them recollect the information provided in the chapter. These notes can be downloaded in PDFS from the official Vedantu’s website.

Reproduction in Animals Chapter 9 Science Notes (CBSE Class 8) - Benefits of Class 8 Chapter 9 Revision Notes

Let us check the benefits of Reproduction in Animals Chapter 9 Science Notes: 

The aim of Class 8 Science Reproduction in Animals notes is to help the students in covering the entire chapter without missing out on any important concept that can come in the exams. 

Most of the time, a chapter in the textbook contains exhaustive information about all the topics. This is done so that the students can understand it well but students need to write only the required portion of this material in the exams. 

Science Class 8 Chapter 9 notes will help the students in revising the entire syllabus and acing their exams. The notes have been prepared in a manner that will also help the students in framing their answers. 

With the help of the revision notes, students can now focus on their studies without wasting their time making the notes. 

Students can understand well the whole chapter in brief from these revision notes. 

Revising from these notes will help the students to stay updated with the chapter and the concepts of this chapter will remain fresh in their minds in a capsulated manner. 

Reproduction in Animals Class 8 Notes CBSE Science Chapter 9 - Summar of the Notes 

Reproduction in Animals is an important chapter and students need to understand its basics well as this knowledge is used as the groundwork for studies in higher classes and when students specialize in the subject of Biology.

Reproduction is the process by which organisms produce young ones of their kind. It can be classified into asexual and sexual reproduction. When reproduction results from the fusion of male and female gametes it is called sexual reproduction and when only a single parent is involved, the reproduction process is asexual. Asexual reproduction can further be classified into budding where offspring develop from buds and binary fission where amoeba reproduces by dividing itself into two. Notes on Reproduction in Animals Class 8 will help the students revise these key concepts easily before the exams.

With the help of these notes, students can easily recollect topics like the reproductive organs in the female and males. The female organs include ovaries, oviducts, and uterus while the male organs include the testes, sperm ducts, and penis.

Notes of Reproduction in Animals Class 8 can be referred to for a quick revision of concepts like fertilization which is an important part of reproduction. The process of the fusion of the ovum with the sperm is called fertilization. The fertilization process that takes place inside the body is called internal fertilization and the fertilization occurring outside the body is termed external fertilization.

The process of fertilization has been explained in simple-to-learn points in Chapter 9 Science Class 8 notes. Animals can be classified into viviparous and oviparous animals based on the offspring they produce. Animals that give birth to young ones are termed viviparous and those that lay eggs are called oviparous animals.

An advantage of these notes is that students can access the pdf file from anywhere and at any time. Going through these notes takes far less amount of time than reading the entire chapter and time is of great value during the exams.

Reproduction in Animals Class 8 CBSE Science Chapter 9- Topics Covered 

Following are the topics that are covered in this chapter:

Modes of Reproduction

Sexual Reproduction

Male Reproductive Organs 

Female Reproductive Organs

Fertilization

Development of Embryo

Viviparous and Oviparous Animals

Young Ones to Adults

Asexual Reproduction

Reproduction in Animals Class 8 CBSE Science Chapter 9- Extra Questions to Practice (Solved)

1. What do you mean by Reproduction?

Ans. Reproduction is a biological process in which new organisms are produced from their parents. 

2. What do you mean by fertilization?

Ans. The fusion of ova and sperm is called fertilization. 

3. What is the name of the fertilized egg?

Ans. Zygote. 

How to Study Science in Class 8 CBSE ? - Tips to Study Better 

Following are some tips to study science in a better way:

Follow the concepts well and understand the core of the chapter. 

Write the concepts in your own words and see if you have understood the topic.

A chapter like reproduction consists of many biological terms which must be paid attention to. 

You can draw the diagram and practice writing the notes and labeling it. 

Revise the chapters regularly so that the concepts are fresh in your mind. 

Why are Revision Notes for Class 8 Chapter 9 - Reproduction in Animals Important?

Vedantu’s Revision Notes for Class 8 Chapter 9 - “Reproduction in Animals” are the finest material to understand and practice the topics in the best way.

The material carries all the information in detail and pointwise.

All the cases of the material are solved in the simplest way which explains the term clearly.

Vedantu Revision Notes for Class 8 Chapter 9 - Reproduction in Animals  provides all the main topics so that the student can focus on it and prepare for the exam. 

Hope the students have gained adequate revision material from this content. Studying from our revision notes will simplify the chapter making it capsuled for the students to prepare it before the exam. Other than this, you must pay attention to the topics covered in this chapter and also the suggestion was given by us on how to study the subject better.

FAQs on Reproduction in Animals Class 8 Notes CBSE Science Chapter 9 (Free PDF Download)

1. Why should the students use the class 8 Chapter 9 science notes for their exam preparation?

Students can use Chapter 9 Science Class 8 notes to prepare their syllabus in a timely and efficient manner. By going through these notes, they can revise all the important topics in a summarised manner. They can skip through the content that they would not need to write in the exam and is given in the textbooks only for explanation. The topics covered under these notes will also help the students in prioritizing the topics. 

2. What is the difference between sexual reproduction and asexual reproduction?

Reproduction in Animals Notes Class 8 has summarised the two types of reproduction in animals in a pointwise format for the students to learn the concepts easily. Reproduction that occurs as a result of the fusion of the male and female gametes is termed sexual reproduction. When only a single parent is involved in the process of reproduction, it is called Asexual reproduction. The revision notes can be referred to by the students for further details on these reproduction types.

3. How is reproduction important for the living organism?

With the help of reproduction, the living organism can continue their existence on this planet. This is the only process where they can duplicate themselves and give birth to a new organism. 

4. Name the animals who reproduce asexually?

Planarians, many annelid worms including polychaetes and some oligochaetes, turbellarians, and sea stars are some animals who reproduce asexually. 

5. From where can I get the free revision notes of Reproduction in Animals?

From the site of Vedantu, you can find all the Science chapter notes including Reproduction in Animals. Just scroll down the page and you will find a free download pdf which you can o=diwnalod and revise whenever you want to. 

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Chapter 9 Class 8 - Reproduction In Animals

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Get Notes, NCERT Solutions and Extra Questions of Chapter 9 Class 8 NCERT - Reproduction in Animals. Teachoo provides the best content to learn about Reproduction with NCERT questions, worksheets, extra questions and revision notes.

In this chapter, we will learn

What is Reproduction

Different Modes of Reproduction

What are Gametes

Reproduction in Human Beings

What is a Test Tube Baby ?

Internal and External Fertilization

Viviparous and Oviparous Animals

What is Metamorphosis

What is asexual reproduction ?

What purpose does the tail in a sperm serve ?

Why do fish and frogs lay eggs in hundreds whereas a hen lays only one egg at a time?

Here, we have divided this chapter into parts - Concepts, NCERT Questions and Extra Questions.

In Concepts , we explain the concept and then questions related to the concept are solved. In NCERT Questions , we have solved each and every question of the NCERT Book - you will find the best solutions at teachoo. And in Extra Questions , we provide Worksheets, practice questions for better understanding of the chapter... and to get more marks!

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Unit 7: Reproduction in animals

Sexual and asexual reproduction.

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Genitalia and Embryonic development

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Viviparous and egg-bearing animals

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Notes of Ch 9 Reproduction in Animals| Class 8th Science

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Important Questions Class 8 Science Chapter 9

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Important Questions Class 8 Science Chapter 9 – Reproduction in Animals

 Science Chapter 9 of Class 8 is about reproduction in animals. This chapter is about learning the different modes of reproduction, like sexual reproduction and asexual reproduction. In the sexual reproduction part, the students will learn about the male reproductive organs, female reproductive organs, and fertilisation. In the asexual reproduction part, the students will learn about budding and binary fission.

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Our Science subject experts understand the importance of frequently solving questions to gain a better understanding of different Science chapters. Our team has carefully chosen questions from different sources including NCERT textbook, NCERT exemplars, past year question papers, and other reference books. Students can refer to our question bank of Chapter 9 Class 8 Science Important Questions to get access to these questions and their answers. 

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Get Access to CBSE Class 8 Science Important Questions 2022-23 with Chapter-Wise Solutions

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Important Questions Class 8 Science Chapter 9 – With Solutions

By referring to Extramarks chapter-wise notes students will gain good knowledge about the chapter. After completing the NCERT textbook students can start solving questions from our question bank of Important Questions Class 8 Science Chapter 9 . 

   We at Extramarks take our role seriously to provide the best resources to the students and help them get excellent grades. The question bank has a variety of question formats including MCQs, short answers, long answers, etc. They represent exam-pattern questions and help students to be more confident while answering the actual exam questions. 

 Given  below are a set of few questions and their answers from our question bank of Important Questions Class 8 Science Chapter 9. Students after solving these questions will also get to revise the entire chapter.

Question 1. Sets of reproductive terms are given below. Choose the set that has an incorrect combination.

• sperm, testis, sperm duct, penis 
•  menstruation, egg, oviduct, uterus 
• sperm, oviduct, egg, uterus 
•  ovulation, egg, oviduct, uterus
• C) Sperm → oviduct, egg → uterus

Reproduction is a process in which organisms make more organisms similar to themselves. Millions of these sperm are in this small amount of semen, and they swim up from the vagina through the cervix following the uterus to meet the egg present in the fallopian tube. It takes sperm to fertilise the egg.

• Around 5 to 6 days after the sperm fertilises the egg, the fertilised egg becomes a multicelled blastocyst.
• A blastocyst is the size of a pinhead, a hollow ball of cells with fluid inside. The blastocyst burrows itself into the uterus lining, called the endometrium.
• The oestrogen hormone causes the endometrium to become thick and rich in blood.
• Progesterone hormone, released by each of the ovaries, keeps the endometrium thick with blood through which the blastocyst may attach to the uterus and absorb nutrients.
• This process is called implantation.

Question 2. Explain the embryo’s future development after it gets embedded in the uterus.

The developing embryo gets embedded in the uterus wall for further development. The embryo continues to develop inside the uterus. It eventually develops body parts such as hands, legs, eyes, head, ears etc. The stage of an embryo in which all the parts of the body can be identified is known as a foetus. When the development of the foetus is completed, the mother gives birth to the baby.

Question 3. How is reproduction in hydra different from that in Amoeba?

Amoeba is a unicellular organism that can change its shape. It is generally found in water bodies like ponds, lakes and slow-moving rivers.

Binary fission in Amoeba

• Initially, the pseudopodia are retrieved. The body of an amoeba is coiled and becomes round.
• Amitosis is observed, and the nucleus’s division occurs, followed by the cytoplasm’s splitting.
• Constriction starts to develop at the point of fission in the amoeba body.
• The furrow or constriction turns deeper, resulting in the formation of two daughter cells.

Budding in Hydra

• Hydra is a freshwater organism, having different species.
• Hydra uses regenerative cells for reproduction, where a bud expands as an outgrowth because of repeated cell division at one specific location.
• These buds then develop into new small individuals who, when completely matured, detach from the parent body.

Question 4. Define asexual reproduction. Explain one method of asexual reproduction in animals.

The continuity of generation in society is a common process. Everyone wants to see the next generation. This process is termed reproduction. The process through which organisms give birth to young, new organisms of the same kind is known as reproduction. There are two main types of reproduction. Sexual and asexual are two types of reproduction. This article will read about asexual reproduction.

Asexual reproduction is the mode of reproduction involved in producing offspring by a single parent. Asexual reproduction is the mode of reproduction in which a single parent produces new offspring. The new individuals produced are physically and genetically identical to each other.

The following are the important features of asexual reproduction:

• A single parent is involved.
• This process of reproduction occurs in a short time.
• No fertilisation or gamete formation takes place.
• The offspring is genetically similar.
• The organisms multiply and grow rapidly.

Types of asexual reproduction

There are various types of asexual reproduction:

• Binary Fission
• Fragmentation
• Vegetative Propagation
• Sporogenesis

Binary fission

The term “fission” indicates “to divide”. Through binary fission, the parent cell gets divided into two cells. The cell division patterns vary in various organisms, i.e., some are directional while others are non-directional.

Example: Amoeba and euglena show binary fission.

It is one of the most simplest and uncomplicated methods of asexual reproduction. The parent cell gets divided into two, each daughter cell containing a nucleus of its own that is genetically identical to its parent. The cytoplasm also takes part in division, leading to two equal-sized genetically identical daughter cells. The process repeats itself, and these daughter cells grow and further divide.

Question 5. The hen is odd in the list of animals given below. (human beings, cows, dogs, hens). The reason for it is 

• it undergoes internal fertilisation. 
• It is oviparous. 
•  It is viviparous. 
•  It undergoes external fertilisation.
• B) It is oviparous

Here, the hen is the odd one out because it is oviparous, i.e. it lays an egg from which young ones are hatched later. Viviparous animals undergo internal fertilisation, and the embryo develops inside the mother until a young one is born. The ovoviviparous animals produce eggs, but the eggs develop inside the mother, and a live organism is born. However, unlike viviparous animals, ovoviviparous animals do not have a placenta. Ovoviviparous animals are born alive.

• Examples of oviparous are birds and reptiles.
• Examples of viviparous species are snakes and sharks.

Question 6. Although two cells called gametes fuse, the product formed is a single cell called the zygote. Justify.

During the process of fertilisation, the sperm gets fused with the egg cell. The content of the sperm cell gets transferred into the egg to form the zygote. Hence, the product formed is a single-celled zygote. A zygote is the first diploid cell formed by the fusion of female and male gametes resulting in the formation of an embryo.

The zygote rapidly divides in the initial 12-24 hours of formation.

The cell mass forms a hollow ball during the process of blastulation.

Cells start differentiating and forming cavities.

The three germ layers form during gastrulation.

Formation of primitive streak is followed by notochord formation

Tubes get formed, making a neurula.

The notochord forms into the neural plate.

The neural plate folds to form a neural tube and crest.

The mesoderm gets divided into axial, paraxial, intermediate and lateral plate mesoderm, which gives rise to different organs.

 Question 7. Why do only male gametes have a tail?

Male gametes or sperms are motile. The tail of the sperm helps the sperm swim through the female’s reproductive tract to reach the oviduct. The male gametes, i.e., sperms, are produced within the male reproductive system. Sperms are small unicellular structures with a head, middle piece, and tail.

• The tip of the sperm head is a portion called the acrosome that enables the sperm to penetrate the egg.
• The midpiece has the mitochondria that supply the energy the tail needs to move and swim.
• The tail moves in whip-like movements back and forth to propel the sperm toward the egg.

Question 8. How can we say that fish exhibit external fertilisation?

External fertilisation in fish:

• External fertilisation is the process where the fusion of male and female gametes occurs in the outside environment.
• The female fish lays its eggs in the surrounding water environment, and the male sperm travels towards the egg randomly in the water.
• The nucleus of sperm moves into the egg and fuses with it.
• Due to water as the external environment, the female eggs do not dry out in case of external fertilisation.
• Since fertilisation occurs in water, outside the female body, it is external fertilisation.
• Hence,  we can say that fish exhibit external fertilisation.

 Question 9. In which female reproductive organ does the embryo get embedded?

The embryo gets embedded in the uterus of the female reproductive system. The female reproductive organ is where the embryo gets embedded in the uterus wall. It is here that the embryo continues its development.

Question 10. What is the uterus?

The uterus is a hollow muscular structure seen in the pelvic region of females between the rectum and the bladder. The uterus’s main function is to nourish the developing foetus until birth.

Over the gestation period which is 9 months in humans, the embryo develops its body parts such as hands, ears, eyes, nose, legs, etc. There is an embryonic stage wherein all body parts can be distinguished, and the embryo has then termed the foetus.

Question 11. Aquatic animals where fertilisation occurs in water are said to be: 

• Viviparous without fertilisation. 
• Oviparous with external fertilisation. 
•  Ovoviviparous with internal fertilisation. 
•  Oviparous with internal fertilisation.
• b) oviparous with external fertilisation.

Fertilisation that occurs on the outside of the body of an organism is known as external fertilisation. It normally requires a water body for successful fertilisation.

• It results in increased genetic variations.
• It produces a larger number of offspring.
• The gametes released can drift, making it easy to find mates.

The female releases its eggs in the water. The male also releases the sperm in the water for fertilising them. The larval life of frogs is in water, whereas the adult life is on land.

Question 12. The eggs of frogs do not have shells for protection, yet they are safe in the water. How?

Answer 12. 

Frog’s eggs are present without any external covering or shell, but a layer of jelly holds the eggs together, thus providing them protection. This jelly or thick covering also protects them from drying up and prevents them from being eaten by other predators or animals.

• In a female frog, the pair of ovaries produce an ovum and pass it to the oviduct, which opens into the cloaca. The cloaca is a common pathway for the process of excretion and reproduction. At a time, 2500 to 3000 eggs are laid and fertilised externally.

Question 13. Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.

Hens are oviparous in nature, in which internal fertilisation takes place. The fertilised egg develops into an embryo inside the body. Frogs are oviparous, in which fertilisation and development of zygote to the embryo and young ones occur outside the body.

• Internal fertilisation occurs in hens. The fertilised egg is enclosed in a protective shell covering the hen’s body and is laid outside for development.
• In frogs, fertilisation and development of zygotes occur outside their body, that is, external fertilisation.

Question 14. The term metamorphosis is not used while describing human development. Why?

In human beings, the body parts of an adult are present from the time of birth. In the metamorphosis process, the parts of the adult are different from those at the time of birth. Metamorphosis does not occur in humans and other viviparous animals because their offspring are entirely formed inside their mother’s womb. They do not require any further differentiation of their body parts. However, the body parts grow and develop to reach maturity after birth.

Question 15. Explain the importance of reproduction in living organisms.

Reproduction is the process of producing or giving birth to an offspring. There are generally two forms of reproduction – Asexual and sexual reproduction.

 Here are some points highlighting the importance of reproducing in living organisms:

• It’s very critical for any species to reproduce to continue their species. Else that species would become extinct.
• Reproduction plays a crucial role in organisms evolution as it creates small variations via genetic recombinations over generations.
• Having a healthy balance is very important for any ecosystem. Reproduction helps to increase the number of species ensuring a good ecosystem balance. 

Question 16. Which of the following statements about reproduction in humans is correct? 

• Fertilisation takes place externally. 
•  Fertilisation takes place in the testes. 
•  During fertilisation, the egg moves towards the sperm. 
•  Fertilisation takes place in the human female.
• D) Fertilisation takes place in the human female (oviduct).

The female reproductive system is framed in such a way to perform different functions. It makes egg cells that are essential for reproduction, called ova. The system is organised for delivering the ova to the region of fertilisation. The egg fertilisation takes place in the fallopian tubes along with the sperm. Implanting in the uterus’s walls and initiating the pregnancy stages is the next step for fertilised eggs. Once sperm enter the vagina, they can move through the cervix, into the uterus, and to the end of a fallopian tube. If sperm can fuse with an egg, fertilisation takes place.

Question 17. A mother gives birth to a baby, but the baby has the characteristics of both parents. How is this possible?

Though the mother gives rise to a baby, fertilisation involves the fusion of gametes from both parents. Hence, the character is obtained by both parents. The zygote, therefore, has both father’s and mother’s contributions. Since the zygote develops into the baby, it has the characteristics of both parents.

• The term used for describing the fusion of the female and male gametes is fertilisation.
• Fertilisation can also be described as the fusion of the male gametes with the female gametes to form a diploid zygote.
• It is a process that occurs after the process of pollination of the carpel. The complete sequence of the process takes place in the zygote to develop into a seed.

Question 18. In markets, birds’ eggs are available but never dogs’ eggs. Why?

Dogs are viviparous. Dogs do not lay eggs, and it gives birth to puppies. Hence, dog eggs are not available in the market. Birds lay their eggs, Birds are oviparous, hence, their eggs are easily available in the market,

• Oviparity refers to a mode of reproduction in which animals lay eggs. These eggs are released into the external environment. Thus, these embryos develop on the outside of the mother’s body. Here, egg yolk nourishes the developing embryo.
• Viviparity refers to the mode of reproduction through which animals directly give birth to their young ones. Therefore, viviparous animals give birth to their young ones without laying eggs. Fertilisation takes place internally inside the female organism.

Question 19. What is metamorphosis? Give examples.

In many living species, the young one or the offspring does not resemble the adult. This is known as indirect development and such a young one is known as a larva or nymph. The process of changing from a nymph or larva to an adult body is known as metamorphosis. This transformation of a larva or nymph into an adult is characterised by a series of morphological, behavioural and physiological changes.

Examples include frogs, butterflies, etc.

• State two differences between a zygote and a foetus.
• It is the earliest stage of development
• It is a single cell
• It is formed by the fusion of male and female gametes
• The zygote usually lasts a week and then develops into its next stage.
• The zygote gets divided several times to form an embryo
• It is the last developmental stage of an organism
• The embryo stage shows all a mature organism’s main recognizable body parts.
• The foetus stage usually occurs after the embryo stage.
• Foetus mainly undergoes internal development.

Question 20. Differentiate between internal fertilisation and external fertilisation.

Fertilisation is generally defined as the fusion of a male and a female gamete.

Internal fertilisation occurs inside the female body.

There are higher chances of survival of the offspring.

Internal fertilisation protects fertilised eggs or embryos from harsh environments.

Examples are cows, humans, dogs, monkeys, etc.

External fertilisation

It occurs on the outside of the female body.

There are low chances of survival of the offspring.

Most aquatic animals use this type of fertilisation, and the advantage of external fertilisation is that it produces many offspring due to external hazards. Examples are fish, frogs, organisms etc.

Question 21. Reproduction by budding takes place in 

•  paramecium 

Reproduction in all the given organisms takes place through asexual methods. Hydra reproduces by forming buds on its body surface, which develops into a new organism. Amoeba, paramecium and bacteria multiply by dividing themselves into two parts, i.e. by binary fission method. Budding is an asexual mode of producing new organisms. In this process, an organism is developed from a small part of the parent’s body.

Benefits of Solving Important Questions Class 8 Science Chapter 9

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• The questions and answers are based on the latest CBSE syllabus and as per CBSE guidelines. So students can rely on them completely. . So we recommend students to refer to our Science Class 8 Chapter 9 Important Questions during their exams and come out with flying colours.  .

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Q.1 Solid sodium chloride does not conduct electricity while molten sodium chloride conducts. Explain why?

Marks: 2 Ans

Solid sodium chloride does not conduct electricity because the particles (ions) are held together by strong forces of electrostatic attraction. In molten state the ions become free and move to conduct electricity, since on heating the bonds between ions become weak.

Q.2 Why is an acid or an ionic salt added to water in the electrolysis of water?

Pure water or distilled water is a bad conductor of electricity whereas acids and bases are good conductors of electricity. When an acid or ionic salts are dissolved in distilled water then the resulting solution conducts electricity.

Q.3 Define electrolysis.

Marks: 1 Ans

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Cbse class 8 science important questions, chapter 1 - crop production and management.

Chapter 2 - Microorganisms : Friend and Foe

Chapter 3 - synthetic fibres and plastics, chapter 4 - materials : metals and non-metals, chapter 5 - coal and petroleum, chapter 6 - combustion and flame, chapter 7 - conservation of plants and animals, chapter 8 - cell - structure and functions, chapter 10 - reaching the age of adolescence, chapter 11 - force and pressure, chapter 12 - friction, chapter 13 - sound, chapter 14 - chemical effects of electric current, chapter 15 - some natural phenomena, chapter 16 - light, chapter 17 - stars and the solar system, chapter 18 - pollution of air and water, faqs (frequently asked questions), 1. apart from the ncert textbook, where can i find good study resources for class 8 science.

You can find the important study materials for Class 8 Science on the Extramarks official website. Our study materials cover all important topics from sources like NCERT textbooks, NCERT exemplar and other reference sources related to the CBSE curriculum. You can build your confidence and improve your scores by practising and revising from our study resources. The important questions and their solutions will help you to clarify your  concepts which will come handy while answering difficult questions in the exams..

  Extramarks credibility lies in providing reliable and trusted study material for all Classes from 1 to 12. To enjoy the maximum benefit of these resources, students just need to register themselves at Extramarks official website and stay ahead of the competition.

2. How many chapters are there in CBSE Class 8 Science syllabus?

Many important chapters that form the base of Class 9 and Class 10 Science are covered in CBSE Class 8 Science syllabus.  Here is a complete list of these eighteen chapters:

• Chapter 1 Crop Production and Management
• Chapter 2 Microorganisms: Friend and Foe
• Chapter 3 Synthetic Fibres and Plastics
• Chapter 4 Materials: Metals and Non-Metals
• Chapter 5 Coal and Petroleum
• Chapter 6 Combustion and Flame
• Chapter 7 Conservation of Plants and Animals
• Chapter 8 Cell – Structure and Functions
• Chapter 9 Reproduction in Animals
• Chapter 10 Reaching the Age of Adolescence
• Chapter 11 Force and Pressure
• Chapter 12 Friction
• Chapter 13 Sound
• Chapter 14 Chemical Effects of Electric Current
• Chapter 15 Some Natural Phenomena
• Chapter 16 Light
• Chapter 17 Stars and The Solar System

Chapter 18 Pollution of Air and Water

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Reproduction in Animals Class 8 Important Questions and Answers

Important questions of Class 8 Science Chapter 9 Reproduction in Animals is given below. These important questions will help students while preparing for the exam.  Practising these important questions will analyse their performance and work on their weak points. Score well in exam of Class 8 Science by going through these important questions. Students of Class 8 can download important questions of Class 8 Science Chapter 9 Reproduction in Animals PDF by clicking the link provided below.

Important Questions of Class 8 Science Chapter 9 Reproduction in Animals

Here you can get  Class 8 Important Questions Science  based on NCERT Text book for Class 8. Science Class 8 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on  Reproduction in Animals  for Class 8 Science subject.

Very Short Answer Questions

1. Name the processes which are essential for the survival of individuals. Answer:  Digestion, circulation, excretion and respiration.

2. What do you mean by reproduction? Answer:  The process which is essential for the continuation of species is called reproduction.

3. What are different modes of reproduction? Answer:  (i) Sexual reproduction (ii) Asexual reproduction.

4. Define the term sexual reproduction. Answer:  The process of reproduction in which fusion of male and female gametes takes place is called sexual reproduction.

5. What is male gamete? Answer:  The reproductive cell produced by male reproductive organs is called male gamete. 

6. What is female gamete? Answer:  The reproductive cell produced by female reproductive organs is called female gamete.

7. Name the male gamete. Answer:  Sperm.

8. What is name of the reproductive organ which produces sperm? Answer:  A pair of testes.

9. Name the female gamete. Answer:  Ovum or egg cell.

10. Which organ produces the ovum? Answer:  A pair of ovaries.

11. What do you mean by fertilisation? Answer:  The process of fusion of male and female gametes to produce zygote is called fertilisation.

12. Name male reproductive organs. Answer:  A pair of testes, two sperm ducts and a penis.

13. Write the names of female reproductive organs. Answer:  A pair of ovaries, oviducts and uterus.

14. What is the other name of oviducts? Answer:  Fallopian tubes.

15. How many types of fertilisation are there? Answer:  There are two types of fertilisation: (i) Internal fertilisation (ii) External fertilisation.

16. What types of fertilisation takes place in humans? Answer:  Internal fertilisation.

17. What type of fertilisation takes place in frog? Answer:  External fertilisation.

18. Write full form of IVF. Answer:  In Vitro Fertilisation.

19. What are test-tube babies? Answer:  The babies born through IVF technique are called test-tube babies.

20. What is embryo? Answer:  The developing zygote having group of cells that develop into tissues and organs, is called embryo.

21. Where does development of embryo take place in the body of female? Answer:  The embryo develops in the uterus of female reproductive organ.

22. What is foetus? Answer:  The well developed embryo is called foetus.

23. Where does the development of embryo take place in those animals which undergo external fertilisation? Answer:  Outside the female body in open

24. What are viviparous animals? Answer:  The animals which give birth to young ones are called viviparous animals.

25. What are oviparous animals? Answer:  The animals which lay eggs are called oviparous animals.

26. Give some examples of viviparous animals. Answer:  Cow, dog, cat and human beings.

27. Give some examples of oviparous animals. Answer:  Hen, lizards etc. and all birds.

28. What do you understand by metamorphosis? Answer:  The transformation of larva into adult through drastic changes is called metamorphosis.

29. Do we also undergo metamorphosis? Answer:  No, we do not undergo metamorphosis.

30. Define the term asexual reproduction. Answer:  When only single parent is involved in reproduction, then it is called asexual reproduction.

31. Name the various methods of asexual reproduction in animals. Answer:  (i) by budding (ii) by fission (iii) by regeneration (iv) by cloning.

32. Write an animal’s name in which asexual reproduction takes place by budding? Answer:  Hydra.

33. What type of reproduction takes place in amoeba? Answer:  Asexual reproduction by binary fission.

Short Answer Type Questions

1: Define Sexual reproduction.

Answer:  Sexual reproduction: Reproduction which begins with the fusion of male and female gamete is called Sexual reproduction.

2: Define Fertilization.

Answer:  Fertilization: Fusion of egg with sperm is called Fertilization.

3: What is Zygote?

Answer:  Fusion of male and female gametes produce fertilize egg which is Zygote.

4: Define internal fertilization.

Answer:  Fertilization which takes place inside female body is called internal fertilization.

5: What is in-vitro fertilization?

Answer:  Fertilization done by doctors, outside the body, is called In-vitro fertilization?

6: How do the hundreds of eggs of frog remain protected even if laid on open aquatic system?

Answer:  A layer of Jelly holds the eggs together and provides them protection.

7: What is External fertilization?

Answer:  The type of fertilization in which fusion of male and female gametes takes place outside the body of female is called External fertilization. It takes place in animals like frog, lizard, fish etc.

8: Give two examples of organisms showing both internal and external mode of fertilization.

Answer: Internal fertilization:  Human and Hen. External fertilization:  Frog and Starfish.

9: What are the common difference between zygote and embryo? .

Answer: Zygote:  Single fertilizes egg and found in oviducts. Embryo:  Ball of cells and gets embedded in the wall of uterus for development.

10: Define Embryo.

Answer:  Zygote divides repeatedly to give ball of cell called Embryo.

11: What is Foetus?

Answer:  The stage of embryo in which all body part can be identified is a Foetus. When the development of foetus is complete, the mother gives birth to the baby.

12: What is the basic difference between reproduction mechanism in human being and hen?

Answer:  Human being gives birth to baby, they are viviparous whereas hen lays egg and they are oviparous.

14: What is Viviparous animal?

Answer:  The animals which give birth to young one are called Viviparous animal. Like cow, dog etc.

15: Explain Metamorphosis.

Answer:  The transformation of larva into adult through drastic changes is called Metamorphosis.

16: Differentiate between internal fertilisation and external fertilisation.

Answer:  

17: Differentiate between zygote and foetus.

18: Name some animals in which young ones are different from adult. 

Answer:  Silkworm and Frog have young ones different from adult.

19: Define asexual mode of reproduction.

Answer:  Mode of reproduction in which only single parent is involved is called asexual reproduction.

20: Does all kind of asexual mode of reproduction can also be called Budding? 

Answer:  No, there is another mode of asexual reproduction apart from Budding, which is Binary fission.

21: Define Binary fission and give name of at least one organism following it.

Answer:   The mode of asexual reproduction in which an animal reproduce itself by dividing into two individual is called Binary fission. Amoeba follows this mode for its reproduction.

22: Differentiate between Budding and Binary fission.

Answer:  In Budding new organism develops from bud, whereas, in Binary fission organism reproduce by dividing itself into two.

23: Explain how chicks are born.

Answer:  Chickens are not actually born, they are hatched from eggs. A chicken will ovulate and lay an egg within 24 hours. The chicken will continue to lay eggs every 24-36 hours. After eggs are layed, it takes about 3 weeks for them to hatch.

24: Name different stages of the lifecycle of a frog and silkworm.

Answer:  Life cycle of frog: Eggs → Early tadpole → Late tadpole → Adult frog Life cycle of a butterfly: Egg → Larva or caterpillar → pupa → Adult

25. What is reproduction? Explain its various modes.

Answer:  The process by which organisms produce new offsprings of same species is called reproduction. Modes of reproduction: There are following two modes of reproduction.

(i) Sexual reproduction:  The method of reproduction in which two parents male, and female are involved is called reproduction.

(ii) Asexual reproduction:  The method of reproduction in which only one parent (male or female) is involved is called asexual reproduction.

26. What are the male reproductive organs?

Answer:  Male reproductive organs include a pair of testes, two sperm ducts and a penis. The testes produce the male gametes called sperm. Millions of sperms are produced by testes. The sperms are very small in size.

27. What is sperm? Explain its structure.

Answer:  Sperm is a male reproductive cell. It is also called male gamete. There are mainly three parts of sperm: (i) Head (ii) Middle piece and (iii) A long tail. Indeed each sperm is a single cell with all the usual cell components.

28. What are the female reproductive organs?

Answer:  The female reproductive organs are a pair of ovaries, oviducts (fallopian tubes) and a uterus. The ovary produces female gametes called ova or eggs. In human beings only one matured egg is released into oviduct by one of the ovaries every month. The development of baby takes place in uterus.

29. What is ovum? Explain its structure.

Answer:  The female reproductive cell is called egg or ovum (plural ova). It is produced by ovaries. Like sperm, ovum is also a single cell and contains nucleus and other usual components.

30. What do you understand about test-tube baby?

Answer:  Some women are unable to bear babies because sperms cannot reach the egg for fertilisation. In such cases, doctors collect freshly released egg and sperm and keep them together for few hours for IVF or in vitro fertilisation. In case fertilisation occurs the zygote is allowed to develop for a week and then it is placed in the mother’s uterus. Complete development takes place in the uterus and the baby is born like any other baby. Babies born through this technique are called test-tube babies.

31. Why is it necessary to produce large number of eggs and sperms by the animals which reproduce by external fertilisation?

Answer:  The animals in which external fertilisation takes place produces a large number of eggs sperms. This is because the eggs and sperms get exposed to water movement, wind and rainfall. There are some other animals that may feed on eggs in the pond. Thus, production of large number of eggs and sperms is necessary to ensure fertilisation of at least a few of them.

32. How do chicks born?

Answer:  After fertilisation the zygote divides repeatedly and travels down the oviduct. As it travels down, many protective layers are formed around it. The hard shell on the hen’s egg is one such protective layer. The hen finally lays egg. The embryo takes about three weeks to develop into a chick. After the chick is completely developed it bursts open the egg shell.

33. Explain the terms viviparous and oviparous with examples.

Answer: Viviparous:  The animals which give birth to young ones are called viviparous animals. For example: cat, dog, cow and human beings. Oviparous:  The animals which lay eggs are called oviparous animals. In such animals development of embryo take place outside the female body. For example: All birds and reptiles.

34. Explain the life-cycle of silkworm in brief.

Answer: In silkworm, the young ones may look very different from the adults. We can write the life-cycle of a silkworm as follows: Egg → Larva or caterpillar → Pupa → Adult. The caterpillar or pupa of silkworm looks very different from the adult moth.

35. Explain the life-cycle of a frog.

Answer:  There are three main stages in the life-cycle of a frog: (i) Egg (ii) Tadpole (larva) (iii) Adult. Tadpoles look different from the adults. After some time, these tadpoles are converted into adult frog.

36. What is asexual reproduction? Write various methods of asexual reproduction.

Answer:  The type of reproduction in which only a single parent is involved is called asexual reproduction. There are following methods of asexual reproduction: (i) By budding (ii) By binary fission (iii) By vegetative reproduction.

37. Explain the asexual reproduction in amoeba.

Answer:  The reproduction in amoeba takes place by binary fission. In this process amoeba reproduces by dividing into two individuals. The nucleus of amoeba cell is divided into two. This is followed by division of its body into two, each part receiving a nucleus. Finally, two amoebae are produced from one parent amoeba. 

38. Explain Metamorphosis.

Answer:  The transformation of larva into an adult through drastic changes is called metamorphosis. For example: The tadpole which develops from the eggs laid by the frog is entirely different from the frog. But when it grows, it becomes just like the frog. This drastic change in tadpole is called metamorphosis.

Long Answer Type Questions

1: Define metamorphosis. Explain it in human beings.

Answer:  The transformation of the larva into an adult through drastic changes is called as metamorphosis. This is the matter of contradiction that human beings undergo metamorphosis or not. Some people say humans don’t go through metamorphosis. We just change size and appearance, but we are not considered to go through metamorphosis. On the other hand some people say Of course we go through metamorphosis! When you are born you are a big foot-long worm and as a young toddler you start to make a cocoon. Then, when you break out at about age 10 you are a normal looking person.

2: Define asexual reproduction. Describe two methods of asexual reproduction in animals.

Answer:  Asexual reproduction is a type of reproduction where fertilization does not take place as only a single parent is involved. Offspring produced is identical to the parent because they are produced as clones. Types of asexual reproduction are as follows: fission, budding and fragmentation.

A. Fission: This type is mainly seen in unicellular prokaryotes. A full-grown organism at a certain stage splits into two identical daughter organisms. B. Budding: In this type of asexual reproduction, a ‘bud’ or an outgrowth is formed on the mature adult body and eventually this bud separates and acts as an individual organism.

3: Why do frogs and fish lay eggs in hundred, whereas a hen lays only one egg at a time?

Answer:  Organisms having internal fertilization like hen, produce one egg at a time. This is so because here there is less chance of failure of fusion between male and female gamete. After the gametes are fertilized there is just the need of development of animal in the form of egg.

Frog like aquatic organisms who shows external mode of reproduction have to lay egg in hundred. The first reason behind this is the single egg is so small in size that it will not be possible to stay to definite position and which in turns make hard for sperm to found and fuse them. Whereas, when large number of eggs make them stick together this makes fertilization possible. Another reason behind this is there is a lot of organisms who feed on these eggs, so larger number of eggs gives more possibility of giving birth to young ones.

4: Why frog lays egg coverless, whereas, Hen lays it with hard cover? Explain.

Answer:  Hen reproduces through internal fertilization in which the egg is already fertilized before coming out as in form of egg.In the case of frog there is external fertilization, hence, egg fertilizes outside the female body. Female lays coverless eggs in the water body later male deposit there sperm over them. And with the help of tail, the sperm swims and fuses with egg. If these eggs have hard covering then it is impossible for the sperm to fuse with them and thus the reproduction cannot be possible.

5: Explain the importance of reproduction in organisms.

Answer: Reproduction is a process which is essential to maintain the life of an individual. The organisms reproduce because of the two main reasons: –

• To continue one’s progeny
• It provides group immortality by replacing the dead individuals with the new ones for the survival of the species on this earth.

6: Explain cloning with an example of first cloned animal.

Answer:   Cloning is defined as the production of exact copy of a cell, any other living part or a complete organism. Cloning of an animal was first of all performed successfully by Lan Wilmut and his colleagues, for the first time a sheep named as dolly was cloned successfully; Dolly was born on 5 July 1996 and was the first mammal to be cloned. The process of cloning involve collection of cell from the mammary gland of a female Finn Dorsett sheep and an egg whose nucleus was removed was obtained from a Scottish blackface ewe then nucleus from the mammary gland of Finn Dorsett sheep was inserted into egg of Scottish blackface ewe, the egg thus produced was implanted into the Scottish blackface ewe, development of this egg take place normally and finally Dolly was produced.

7: What do you mean by reproduction? Explain various modes of reproduction.

Answer:  The process of producing young ones of the same species is known as reproduction. It is very important process. It helps in the continuation of a species on the earth. Modes of Reproduction: There are following modes of reproduction: (i) Sexual reproduction (ii) Asexual reproduction.

(i) Sexual reproduction:  The process of reproduction in which two parents (male and female) are involved is called sexual reproduction. In this process male produces male gametes and female produces female gametes. Both the gametes are fused to form zygote. The zygote develops into baby. Example: cow, cat, dog and human beings.

(ii) Asexual reproduction:  The mode of reproduction in which only one parent is involved to produce new young ones is called asexual reproduction. Budding, fragmentation spore formation and binary fission are the methods of asexual reproduction like in hydra, amoeba and bacteria etc.

8: What is fertilisation? Explain various types of fertilisation.

Answer:  When sperms come in contact of an egg, one of the sperms may fuse with the egg. Such type of fusion of sperm and egg is called fertilisation. In this process formation of zygote takes place. There are following two types of fertilisation: (i) Internal fertilisation (ii) External fertilisation.

(i) Internal fertilisation : The fertilisation in which fusion of egg and sperm takes place inside the body of female is called internal fertilisation. Internal fertilisation takes place in many animals like, cow, dogs, hens and human beings.

(ii) External fertilisation:  The fertilisation in which fusion of egg and sperm takes place outside the body of female is called external fertilisation. It is very common in aquatic animals like fish, frog and starfish etc.

9: Explain the fertilisation in frog.

Answer:  In frogs external fertilisation takes place. During rainy season frogs move to ponds and slow-flowing streams. When the male and female frog come together in water, the female lays hundreds of eggs. The eggs of frog are not covered by a shell and they are comparatively very delicate. A layer of jelly holds the eggs together and provides protection to the eggs. As the eggs are laid, the male deposits sperms over them. Each sperm swims randomly in water with the help of its tail. The sperms come in contact with eggs and fuse together. This results in fertilisation

10: Explain the development of embryo.

Answer:  Fertilisation results in the formation of zygote which begins to develop into an embryo. The zygote divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is termed as embryo. This embryo gets embedded in the wall of the uterus for further development. The embryo continues to develop in the uterus. It gradually develops body parts such as hands, legs, head, eyes and ears etc. This stage is called foetus. Mother gives birth to the baby when foetus developed completely.

Fig. (a) Zygote formation and development of an embryo from the zygote; (b) Ball of cells (enlarged); (c) Embedding of the embryo in the uterus (enlarged).

11: Explain the formation of clone Dolly.

Answer:  Cloning is the production of an exact copy of a cell, a part or complete body. Dolly was the first clone born on 5 th  July 1996 and was the first mammal to be cloned. It is cloned by Ian Wilmut and his colleagues. During the process of cloning Dolly, a cell was collected from the mammary gland of female Finn Dorsett sheep.

Fig. (a) Finn Dorsett sheep (b) Scottish blackface ewe (c) Dolly (July 1996 to Feb. 2003) .

Simultaneously, an egg was obtained from a Scottish blackface ewe. The nucleus was removed from the egg, then the nucleus of mammary gland cell from the Finn Dorsett sheep was inserted into egg of Scottish blackface ewe. Development of this egg followed normally and finally Dolly was born. It was found to be absolutely identical to the Finn Dorsett sheep and produced several offspring of her own through normal sexual means. Dolly died on 14 th  February 2003 due to a certain lung disease

12: What are Sexually Transmitted Diseases? How can they be prevented?

Answer:   The diseases spread only by sexual contact are called sexually transmitted diseases (STDs). When a healthy person contacts sexually to a person which is infected, then the microorganisms are transmitted from infected person to the healthy person and that becomes infected. Syphilis, gonorrhoea, herpes and AIDS are some sexually transmitted diseases. Herpes and AIDS are not curable diseases. These are fatal diseases, which destroy the immune system of the patient. Sexual hygiene and safe sexual relationship are the only way to prevent sexually transmitted diseases.

NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12

NCERT Exemplar Class 8 Science Chapter 9 Reproduction in Animals

June 20, 2022 by Sastry CBSE

NCERT Exemplar Class 8 Science Chapter 9 Reproduction in Animals are part of NCERT Exemplar Class 8 Science . Here we have given NCERT Exemplar Class 8 Science Chapter 9 Reproduction in Animals.

Multiple Choice Questions

Question. 1 Sets of reproductive terms are given below. Choose the set that has an incorrect combination. (a) Sperm, testis, sperm duct, penis (b) Menstruation, egg, oviduct, uterus (c) Sperm, oviduct, egg, uterus (d) Ovulation, egg, oviduct, uterus Answer. (c) Set (c) has an incorrect combination. This is because it has parts of both male and female reproductive system. Sperm is the male gamete while oviduct, egg and uterus are parts of female reproductive system.

Question. 2 In humans, the development of fertilised egg takes place in the (a) ovary (b) testis (c) oviduct (d) uterus Answer. (d) The development of fertilised egg takes place in the uterus (womb). The embryo gets embedded in the wall of the uterus for development by implantation.

Question. 3 In the list of animals given below, hen is the odd one out.Human being, cow, dog, hen. The reason for this is (a) it undergoes internal fertilisation (b) it is oviparous (c) it is viviparous (d) it undergoes external fertilisation Answer. (b) Hen is odd one out because it is oviparous, i.e. it lays egg from which young ones are hatched later on. The rest three (human being, cow and dog) are viviparous, i.e. give birth to young ones after they are fully developed.

Question. 4 Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following. (a) The animals are small in size and want to produce more offsprings (b) Food is available in plenty in water (c) To ensure better chance of fertilisation (d) Water promotes production of large number of gametes Answer. (c) A large number of gametes are released by such animals to ensure better chance of fertilisation. Since, the gametes are laid in water, many of them are carried away by moving water, wind or rain and many are eaten by other animals.Therefore, production of large number of gametes is necessary.

Question. 5 Reproduction by budding takes place in (a) Hydra (b) Paramecium (c) Amoeba (d) Bacteria Answer. (aj In Hydra, reproduction takes place by budding. A small part of the body of an organism grows as ‘bud’ which then detaches and becomes a new organism. The other options Amoeba, Paramecium and bacteria reproduce asexually by binary fission.

Question. 6 Which of the following statements about reproduction in humans is correct? (a) Fertilisation takes place externally (b) Fertilisation takes place in the testes (c) During fertilisation, egg moves towards the sperm (d) Fertilisation takes place in the human female Answer. (d) Fertilisation in humans takes place in the female body. The sperms of man are introduced by penis into female’s body through vagina. The sperms then pass through the uterus and reach to oviducts. It is here, that sperm combines with egg to form zygote (i.e fertilisation occurs).

Question. 7 In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is (a) ovum (b) embryo (c) foetus (d) zygote Answer. (b) After fertilisation, the zygote divides repeatedly to form a ball of hundreds of cells called an embryo. The embryo moves down from oviduct into the uterus, where it gets embedded. This is called implantation.

Question. 8 Aquatic animals in which fertilisation occurs in water are said to be (a) viviparous without fertilisation (b) oviparous with external fertilisation (c) viviparous with internal fertilisation (d) oviparous with internal fertilisation Answer. (b) The aquatic animals in which fertilisation occurs in water are oviparous with external fertilisation. They lay eggs and release sperms outside body in the water for fertilisation to take place. The young one top is formed outside the body in water from the zygote formed inside eggs.

Question. 9 After fertilisation, the resulting cell which gives rise to a new individual is the (a) embryo (b) ovum (c) foetus (d) zygote Answer. (d) After fertilisation (i.e. combining of sperm with the egg), zygote is formed. It is the beginning of formation of a new individual. All the multicellular animals start their life from a single cell called zygote.

Question. 10 In human beings, the correct sequence of events during reproduction is (a) gamete formation, fertilisation, zygote, embryo (b) embryo, zygote, fertilisation, gamete formation (c) fertilisation, gamete formation, embryo, zygote (d) gamete formation, fertilisation, embryo, zygote Answer. (a) In human beings, sexual reproduction takes place by the combination of gametes, i.e. sperm and egg, formed in male and female, respectively. The fusion of gametes is called fertilisation. The fusion forms a zygote, which divides repeatedly to form the embryo. The embryo gets implanted in female uterus for further development to form foetus.

Very Short Answer Type Questions

Question. 11 Although two cells called gametes fuse, the product formed is a single cell called zygote. Justify. Answer. During fertilisation, only the nuclei of male and female gametes fuse. The sperm reaches to egg and only its nucleus enters the egg cell and fuses with the egg nucleus to form the single-celled structure called zygote. The cell formed consists of only one nucleus but is diploid in nature.

Question. 13 What is the importance of reproduction? Answer. Reproduction is important for organisms because it ensures the continuity of life on earth. It is the means of multiplication and perpetuation of a species. It also creates variations among the population.

Question. 14 In markets, eggs of birds are available but never eggs of dogs, why? Answer. Birds are oviparous, i.e. lay eggs outside their body. So, it is easy to collect their eggs and these are thus available in market. On the contrary, dogs are viviparous, i.e. do not lay eggs but give birth to young ones. Their eggs are extremely small which remain inside their bodies.

Question. 15 The eggs of frogs do not have shells for protection, yet they are safe in water, how? Answer. Frog’s eggs are without any external covering or shell but a layer of jelly hold the eggs together, thus providing them protection. This jelly or gelatinous covering also protects them from drying up and prevents them from being eaten up by other animals or predators.

Short Answer Type Questions

Question. 16 Fill up the blanks with the terms given below: body, asexual, binary, single, nucleus Amoeba is a………….. celled organism. It reproduces by…………… reproduction. The process of reproduction begins by the division of its………….. into two. This is followed by the division of its …………… into two. This type of reproduction is called…………… fission. Answer. Single,asexual, nucleus, body, binary

Question. 17 The term ‘metamorphosis’ is not used while describing human development. Why? Answer. The term ‘metamorphosis’ is not used while describing human development because in human beings, body parts of an adult are present from the time of birth itself, i.e. while beginning of life as a baby and until you are an adult, the basic plan of body does not change. On the contrary, in metamorphosis, the parts of the adult are different from those at the time of birth.

Question. 18 Mother gives birth to a baby but the baby has characters of both parents. How is this possible? Answer. Although, mother gives birth to a baby but the baby is formed from the fertilisation of male and female gamete that comes from the father and mother, respectively. The nuclei of both the parent gametes fuse to form a zygote with new character combinations from both parents. Hence, the zygote formed from fertilisation have characters of both the parents. This zygote develops inside the female body (uterus) and finally takes birth as baby.

Question. 19 How is reproduction in Hydra different from that in Amoeba? Answer. Both Hydra and Amoeba reproduce asexually involving only single parent but the mode of reproduction is different. Hydra reproduces from bulges or buds arising from the parent body that grows’ and matures into another organism, i.e. by budding, while Amoeba reproduces by binary fission, i.e. splitting of parent organism to form two new organisms.

Question. 20 State whether the following statements are True/False 1. External fertilisation can occur both in water and on land. 2. The eggs of fish are covered by hard shells for protection. 3. Human egg has a head, middle piece and tail. 4. In adult human females, a single mature egg is released into an oviduct every month. Answer. 1. False, external fertilisation occurs only in water and not on land. 2. False, the eggs of fish are covered by gelatinous or jelly-like covering for protection. 3. False, human sperm has a head, middle piece and tail. 4. True

Question. 21 Why do only malejjametes have a tail? Answer. Male gametes or sperms have tail to facilitate movement of sperms and help them to reach the egg (female gamete) for fertilisation.

Long Answer Type Questions

Question. 24 How can we say that fish exhibits external fertilisation? Answer. Female fish lay eggs in water while male fish releases its sperms in water. Sperms swim and reach the eggs of fish, randomly due to water currents.When a sperm comes in contact with the viable egg, nuclei of both the cell fuses to form a zygote. This process of fertilisation takes place in water outside the female body, hence fertilisation is external in fishes.

Question. 26 Hens and frogs are both oviparous exhibiting different types of fertilisation, explain. Answer. Hens are oviparous in which internal fertilisation takes place. The fertilised egg divides repeatedly to form an embryo inside the body. The embryo however, travels down the oviduct with many protective layers forming around it. After the hard egg shell is formed around the developing embryo, the hen lays the eggs outside. After about 3 weeks, the development of chick from egg takes place. On the contrary, frogs are oviparous in which external fertilisation occurs. The frogs lay eggs and sperms in water, which comes in contact to undergo fertilisation. In this way, a female frog’s eggs get fertilised by sperms outside its body, i.e external fertilisation. The fertilised eggs are covered by a jelly for protection. The development of embryo takes place in the egg in water, i.e they are oviparous.

NCERT Exemplar Class 8 Science Solutions

• Chapter 1 Crop Production and Management
• Chapter 2 Microorganisms: Friend and Foe
• Chapter 3 Synthetic Fibres and Plastics
• Chapter 4 Materials : Metals and Non-Metals
• Chapter 5 Coal and Petroleum
• Chapter 6 Combustion and Flame
• Chapter 7 Conservation of Plants and Animals
• Chapter 8 Cell Structure and Functions
• Chapter 9 Reproduction in Animals
• Chapter 10 Reaching the Age of Adolescence
• Chapter 11 Force and Pressure
• Chapter 12 Friction
• Chapter 13 Sound
• Chapter 14 Chemical Effects of Electric Current
• Chapter 15 Some Natural Phenomena
• Chapter 16 Light
• Chapter 17 Stars and the Solar System
• Chapter 18 Pollution of Air and Water

NCERT Exemplar Solutions NCERT Exemplar Maths NCERT Exemplar Science

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Reproduction in Animals Class 8 MCQ Test (Online Available)

Free mcq test, table of content, reproduction in animals test - 20.

Duration: 10 Mins

Maximum Marks: 10

Read the following instructions carefully.

1. The test contains 10 total questions.

2. Each question has 4 options out of which only one is correct .

3. You have to finish the test in 10 minutes.

4. You will be awarded 1 mark for each correct answer.

5. You can view your Score & Rank after submitting the test.

6. Check detailed Solution with explanation after submitting the test.

7. Rank is calculated on the basis of Marks Scored & Time

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The chapter Reproduction in Animals is one of the important chapters in class 8. The highly qualified experts of Selfstudys developed these Reproduction in Animals class 8 MCQ to test what students have learnt and also helps them to identify their strengths and weaknesses. 

These MCQ on Reproduction in Animals history class 8 are developed as per the latest pattern of CBSE (Central Board of Secondary Education). If a student wants to secure good marks in their exams, then they should attempt Reproduction in Animals class 8 MCQ. 

The MCQ on Reproduction in Animals history class 8 is created with detailed explanation of concepts which can help students understand the concepts better and also increases their objective knowledge. 

Format of Reproduction in Animals Class 8 MCQ 

By regularly practising the MCQ on Reproduction in Animals History class 8, the students will get to know about the most common repeated questions. They will also get to know about the HOTS Questions (High Order Thinking Skills). The Reproduction in Animals class 8 MCQ also helps the students to do a thorough revision for their final examinations. 

The Reproduction in Animals class 8 MCQ is developed as per the question papers of the last 5 years to help the students to give an idea about the most repeated questions and also about the pattern of the examination. 

Steps To Attempt The Reproduction in Animals Class 8 MCQ 

If students want to attempt Reproduction in Animals class 8 MCQ, they need to follow the following steps: 

• The first step is to go to the official website of selfstudys i.e. selfstudys.com.

• Click on the three lines on the upper left side, and then tap on the ‘CBSE’ Option, scroll down and click on the option stating ‘MCQ Tests’.

• A page will appear in which there will be options for choosing classes. 
• Choose class 8.

• Now, you have to choose the subject and the chapter. 
• Now, you can attempt Reproduction in Animals History Class 8 MCQ.

Instructions To Attempt Reproduction in Animals Class 8 MCQ 

Before starting the Reproduction in Animals class 8 MCQ, it is advisable for all the students to go through the instructions to attempt the Reproduction in Animals class 8 MCQ; 

• The total number of questions in the Reproduction in Animals class 8 MCQ is 10. 
• Out of 4 options in the MCQ on Reproduction in Animals history class 8, only 1 is correct. 
• The duration in the Reproduction in Animals history class 8 MCQ will be 10 minutes to ensure time management among the students. 
• For each correct answer, the students will be given 1 mark. 
• After submitting the Reproduction in Animals class 8 MCQ, all the students can have a look at the answers with detailed information. 
• On the basis of the marks scored in the Reproduction in Animals class 8 MCQ test and time taken by the student to complete the test, the rank will be calculated. 

How To Prepare for The Reproduction in Animals Class 8 MCQ? 

All the students should prepare for Reproduction in Animals class 8 MCQ in the following way to secure good marks in their examination: 

• Start by memorising the important notes: The first step is to brush up all the important notes to create a strong base for the learning if a student is preparing for Reproduction in Animals history class 8 MCQ. Multiple choice questions is one of the most effective methods to test the skills of students and also it helps to know how well prepared a student is for the exam. 
• Make Acronyms: Another effective method which is advisable for all the students is to make acronyms to prepare for Reproduction in Animals class 8 MCQ. The procedure for that will be taking the first alphabet of the word and relating it with a word so that it becomes easy for you to remember. 
• Make flashcards: Making flashcards is also an effective way to prepare for the Reproduction in Animals class 8 MCQ which can help you to explain and relate key terms and names. Flashcards are a great tool if a student wants to do revision after the completion of their preparation. It also helps to recall all the important concepts which is a very important skill in the case of MCQ tests. 
• Put important information into a song which you like: Take a musical tune that is easy to memorise and replace the words with important dates, names and other important things. 
• Quiz yourself: Develop your own questions after going through the CBSE Class 8 syllabus and important notes. After creating 10 questions, test your knowledge to see how well you know the topic and also to identify your strengths and weaknesses. 

How Regular Practice of Reproduction in Animals Class 8 MCQ Can Help Students Improve Their Scores 

The first thing which a student wants to know after completing the preparation of Reproduction in Animals history class 8 MCQ, they want to know how well are they actually prepared for the exam

The benefits of Reproduction in Animals class 8 MCQ are huge, a student can get to know about their strengths and weaknesses and also the areas where they lack. 

Benefits of The Reproduction in Animals Class 8 MCQ 

There are numerous benefits of Reproduction in Animals history class 8 MCQ can help students to improve their marks in examinations. Some of them are: 

• Flexible Questioning Technique: Flexible questioning technique is used in the Reproduction in Animals class 8 MCQ which can promote effective learning among the students and as MCQ questions are versatile, students can learn them with critical thinking. 
• Time Management: The Reproduction in Animals class 8 MCQ helps the students to manage their time effectively. Time management reduces the chance of procrastination which can increase the chances for scoring well in the examination for all the students. As the time duration of the Reproduction in Animals class 8 MCQ will only be 10 minutes, it can be helpful for students as they will have more time for other important study materials. 
• Fast: The Reproduction in Animals history class 8 MCQ is fast as compared to other modes of exam available. Examples include offline (pen and paper) etc. This can be beneficial for students as they will get the status of their exam preparation fast. 
• Developed by the Subject Matter Experts: These Reproduction in Animals class 8 MCQ are developed by the subject matter experts of selfstudys.com who have years of experience in the educational field and are aware of the most common questions which can be asked in examinations. 
• Give the idea of the pattern of the exam: The Reproduction in Animals class 8 MCQ gives the idea of the pattern of the exam to the students which can make them confident and also help them to score well in the exam. 
• Improve the skills of the students: The Reproduction in Animals history class 8 MCQ can significantly improve critical thinking, management skills and time management skills. 

Hacks to Score Well in the Reproduction in Animals class 8 MCQ

If a student want to score well in the Reproduction in Animals class 8 MCQ, they can try the following hacks: 

• Read the complete question: It is advisable for students to read the entire question of the MCQ on Reproduction in Animals history class 8 completely as it helps them to understand the requirement of the question. Students often feel that they know the answer by looking at the question and without reading the complete question, they choose the most logical answer. This mistake is very common among the students. 
• Answer it in your mind first: Answer the question in your mind after reading the Reproduction in Animals history class 8 MCQ without looking at the options. Try to answer it without looking at the options as it will help you to be completely sure about the answer. 
• Attempt the questions you know first: Students are advised to attempt the questions for which they are completely sure that they know the answer whereas if a student doesn’t know the particular answer, they can skip it. By doing this, no unnecessary time will be wasted and time management will be ensured. 
• Make a guess: Students should make a guess while attempting the Reproduction in Animals class 8 MCQ because there is no negative marking. So, there is no need to skip any questions. 

How To Select The Correct Answers To The Reproduction in Animals History Class 8 MCQ?

• Use the process of elimination: After reading the entire questions and all the four options, students can use the process of elimination for the options for which they are 100% sure that they are incorrect. Even if they know the correct option, students are advised to use the elimination process. 
• “All of the above” and “None of the above”:  While attempting the Reproduction in Animals class 8 MCQ, if you see options like “All of the above” and “none of the above”, prefer not to choose them unless you are 100% sure as students think that this is the correct option.
• Find the answers hidden in the Question: A lot of times, the answers are hidden in the given questions so, try to find the answers hidden in Reproduction in Animals class 8 MCQ. Try decoding the questions by rereading them as you can find them in the questions itself. 
• True or False Test: Doing a true or false test in Reproduction in Animals Science Class 8 MCQ can be very beneficial as it can be easier for a student to not consider all the false answer options and choose the correct answer.
• Possibility of two correct answers: If in case, two answers look correct with all of the above options while attempting the Class 8 Reproduction in Animals of History MCQ, then there is a strong possibility that it is the correct answer option. 

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NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals

Table of Contents

The NCERT Solutions for Class 8 Science Chapter 9 are very helpful for students who want to score well in their exams. The solutions provide a clear and concise explanation of all the concepts covered in the chapter. The solutions are prepared by our experts keeping in mind the latest CBSE curriculum and providing detailed and easy-to-understand explanations for all the concepts discussed in the chapter.

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The NCERT Solution for Class 8 Science Chapter 9 is a valuable resource for students in Class 8. INFINITY LEARN provides these NCERT Solutions to assist students in gaining an understanding of the topic and effectively preparing for the examination. Students may also benefit from using NCERT Solutions Class 8th Science Chapter 9 to familiarise themselves with the syllabus and test material. All of the exercise questions in Chapter 9 of the Class 8 Science textbook are answered in NCERT Solutions . These are created by professional educators to help you understand all of the concepts covered in the chapter. Now you may get the free PDF.

INFINITY LEARN is a website that offers students free NCERT solutions and other study tools. Students looking for better solutions can obtain Class 8 Science NCERT Solutions to aid in their revision.

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Reproduction in Animals Class 8 NCERT Solutions Chapter 9

Ques 1. Explain the importance of reproduction in organisms.

• Reproduction ensures the continuation of similar kinds of individuals, generation after generation.
• Reproduction is essential for the continuation of a species.

Ques 2.Describe the process of fertilization in human beings.

• In human beings fertilization takes place inside the female body (internal fertilization).
• Males eject sperms inside female bodies
• Out of millions of sperms produced, one sperm will fuse with the egg cell.
• This process in which the ovum and sperm fuse to form zygote is called
• During this process the nucleus of the sperm fuses with the nucleus of the ovum to form a single diploid cell i.e., zygote.

Ques 3. Choose the most appropriate answer :

a. Internal fertilisation occurs : ( i )

i) in female body ii) outside female body

iii) in male body iv) outside male body

b. A tadpole develops into an adult frog by the process of : ( ii )

i) fertilisation ii) metamorphosis iii) embedding iv) budding

c. The number of nuclei present in a zygote is : ( ii )

i) none ii) one iii) two iv) four

Ques 4. Indicate whether the following sentences are True (T) or False (F) :

a) Oviparous animals give birth to young ones. ( F )

b) Each sperm is a single cell. ( T )

c) External fertilization takes place in frog. ( T )

d) A new human individual developed from a cell is called gamete. ( F )

e) Egg laid after fertilization is made up of a single cell. ( T )

f) Amoeba reproduces by budding. ( F )

g) Fertilization is necessary even in asexual reproduction. ( F )

h) Binary fission is a method of asexual reproduction. ( T )

i) A zygote is formed as a result of fertilization. ( T )

j) An embryo is made up of a single cell. ( F )

Ques 5. Complete the crossword puzzle using the hints given below.

1. The process of the fusion of the gametes.

6.The type of fertilisation in hen.

7.The term used for bulges observed on the sides of the body of Hydra .

8.Eggs are produced here.

2.Sperms are produced in these male reproductive organs.

3.Another term for the fertilised egg.

4.These animals lay eggs.

5.A type of fission in Amoeba.

Ques 6. Give two differences between a zygote and a foetus.

Ques 7. Define asexual reproduction. Describe the two methods of asexual reproduction in animals.

Ans. The method of reproduction in which only a single parent is involved is called asexual reproduction. (Or) The reproduction that occurs without formation and fusion of gametes is called asexual reproduction.

The methods through which animals reproduce asexually are Budding, Binary fission etc.

a) Budding :

• In this method, a part of an organism starts bulging out. This is called
• This bud gradually grows and develops into a separate individual.

Eg : Hydra , Yeast etc.

b) Binary fission : In this method, the nucleus of an organism divides into two followed by division of their bodies, each part getting one nucleus and developing into a separate individual.

Eg: Amoeba , Bacteria etc.

Ques 8. In which female reproductive organ does the embryo get embedded ?

Ans. Uterus is the female reproductive organ in which embryo gets embedded.

9. What is metamorphosis ? Give examples.

Ans. The transformation of the larva into adult through drastic changes is called metamorphosis.

Eg : Silkworm, Frog etc.

Reproduction in Animals Class 8

Our website and app make it very simple to acquire NCERT Solution for Reproduction in Animals Class 8 Chapter 9 PDF. The part on animal reproduction in NCERT Class 8 Science is fascinating. The item provides information on several types of duplication and illustrates them with diagrams.

Students’ knowledge will be enhanced via assignments included in the curriculum, which will help them score higher on exams. Biology is a subject that is purely theoretical. As a result, it is extremely difficult for pupils to retain all of the concepts presented in the syllabus. NCERT Solution uses a new mastering technique to help you comprehend and memorize Biology ideas, making it easier for you to understand.

Animal Reproduction (Chapter 9)

NCERT Solutions for Class 8th Science Chapter 9 Animal Reproduction is a simple and interesting chapter. This chapter covers asexual and sexual reproduction in animals, animal reproduction modes, fertilization, and its various kinds, binary fission, hydra budding, reproductive organs, and more. The content includes all conceivable questions and answers, as well as diagrams and some enjoyable exercises. Each line of the chapter is described in such a way that any student may understand and memorize it without difficulty. All types of questions that are more likely to appear in the exam are covered in NCERT Solutions.

Related Information

• NCERT Solutions for Class 8 English
• NCERT Solutions for Class 8 Maths
• NCERT Solutions for Class 8 Social Science

Weightage of Class 8 Science Chapter-Wise Marks

Chapter 9 in Class 8 is one of the most essential topics, with the highest weightage. Every year in the tests, questions from this chapter reappear. The materials will assist you in preparing for this chapter and achieving a high score. Here’s some more information regarding the chapter’s content:

9.1 Define asexual reproduction (1 short)

9.2 Types of asexual reproduction in animals (2 long)

9.3 Difference between internal and external fertilization (1 long)

9.4 What is a metamorphosis (1 short)

9.5 Difference between a zygote and a fetus (2 long)

9.6 Binary fission in amoeba (1 short)

9.7 Budding in hydra (1 short)

Why is it vital to use NCERT Solutions for Class 8 Science Chapter 9?

• The answers to the problems are given in great detail, complete with pictures and explanations.
• NCERT Solutions assist you in gaining a theoretical understanding of the subject.
• Our subject specialists explain all of the answers in a straightforward manner.
• These solutions can assist you with last-minute exam preparation.
• It includes all actions that aid pupils in their preparation.
• The chapter is summarised in the NCERT Solutions.

FAQs on NCERT Class 8 Science Chapter 9 Reproduction in Animals

What is ncert class 8 science chapter 9 about.

NCERT Class 8 Science Chapter 9 focuses on the process of reproduction in animals, covering various aspects of asexual and sexual reproduction.

What are the key concepts in this chapter?

This chapter introduces concepts such as asexual and sexual reproduction, modes of asexual reproduction, and differences between them.

What are the benefits of studying this chapter?

Studying this chapter will help you understand the diverse ways animals reproduce, which is essential to comprehend the animal kingdom.

Is this chapter important for exams?

Yes, reproduction in animals is a fundamental biological concept and might be asked in exams.

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NCERT Exemplar Class 8 Science Solutions for Chapter 9 - Reproduction In Animals

Ncert exemplar solutions class 8 science chapter 9 – free pdf download.

The NCERT Exemplar for Class 8 Science Chapter 9 Reproduction in Animals is a perfect tool for the CBSE Class 8 examination. This Exemplar solution will help you learn concepts comprehensively by strengthening your basics. By solving these Exemplar questions, you will be able to clear the doubts that can come to your mind. The NCERT Exemplar for Class 8 Science Chapter 9 will benefit you immensely, as the solutions help you understand the topics in-depth. Besides, this will aid in learning advanced topics. This exemplar has a variety of questions and answers which you can rely on for your exam preparation.

The chapter Reproduction in Animals is about learning the different modes of reproduction, like sexual reproduction and asexual reproduction. In the sexual reproduction section, students will learn about the male reproductive organs, female reproductive organs and fertilisation. In the asexual reproduction section, they will learn about budding and binary fission. To score good marks in the exam, students are advised to solve the questions from the NCERT Exemplar for Class 8 Chapter 9 Reproduction in Animals. Visit the below link to download the NCERT Exemplar for Class 8 Chapter 9 .

Download the PDF of NCERT Exemplar Class 8 Science Solutions for Chapter 9 – Reproduction in Animals

Access Answers to the NCERT Exemplar Class 8 Science Chapter 9 – Reproduction in Animals

Multiple choice questions.

1. Sets of reproductive terms are given below. Choose the set that has an incorrect combination.

(a) sperm, testis, sperm duct, penis

(b) menstruation, egg, oviduct, uterus

(c) sperm, oviduct, egg, uterus

(d) ovulation, egg, oviduct, uterus

Explanation:

Sperm is male gamete, the egg is female gamete, oviduct and uterus are part of the female reproductive system. Hence option c) is an incorrect combination.

2. In humans, the development of the fertilised egg takes place in the

(c) oviduct

Answer is (d) uterus

The development of the fertilised egg takes place in the uterus. Embryo gets embedded in the wall of the uterus for development by implantation.

3. In the list of animals given below, the hen is the odd one out.

The reason for this is

(a) it undergoes internal fertilisation.

(b) it is oviparous.

(c) it is viviparous.

(d) it undergoes external fertilisation.

Answer is (b) it is oviparous

The hen is oviparous, it lays the egg and the young one gets hatched later.

Rest of the animals provided are viviparous. They give birth to young ones after they are developed completely.

4. Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following.

(a) The animals are small in size and want to produce more offsprings.

(b) Food is available is plenty of water.

(c) To ensure a better chance of fertilisation.

(d) Water promotes the production of a large number of gametes.

Answer is (c) To ensure a better chance of fertilization

Because they release gametes in water chances of getting washed away by water, wind and rain are more. Hence To ensure better chance of fertilisation. A large number of gametes are produced by Animals exhibiting external fertilization.

5. Reproduction by budding takes place in

(c) paramecium

(d) bacteria

Answer is (a) hydra

Paramecium, Amoeba and bacteria reproduce by binary fission. Hydra reproduces by budding where a bud detaches from the parent which grows into a complete organism.

6. Which of the following statements about reproduction in humans is correct?

(a) Fertilisation takes place externally.

(b) Fertilisation takes place in the testes.

(c) During fertilisation, egg moves towards the sperm.

(d) Fertilisation takes place in the human female.

Male gametes are introduced into a female’s body through the vagina. Sperm reach uterus through the oviduct. At uterus, egg gets fertilized by sperm to form a zygote.

7. In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is

Answer is (b) embryo

Egg fuses with sperm to form the zygote which will divide to form a clump of hundreds of cells which form the embryo. The process of moving down embryo from oviduct into the uterus is called as implantation.

8. Aquatic animals in which fertilisation occurs in water are said to be:

(a) viviparous without fertilisation.

(b) oviparous with external fertilisation.

(c) viviparous with internal fertilisation.

(d) oviparous with internal fertilisation.

Answer is (b) oviparous with external fertilisation.

Aquatic animals lay eggs and release sperms into the water for fertilization to take place. Young one is formed outside the body hence it is called external fertilization.

9. After fertilisation, the resulting cell which gives rise to a new individual is the

Answer is (d) zygote

The zygote is the beginning of the formation of a new individual. All the multicellular organisms start their life from single-celled zygote.

10. In human beings, the correct sequence of events during reproduction is

(a) gamete formation, fertilisation, zygote, embryo

(b) embryo, zygote, fertilisation, gamete formation

(c) fertilisation, gamete formation, embryo, the zygote

(d) gamete formation, fertilisation, embryo, the zygote

Answer is (a) gamete formation, fertilisation, zygote, embryo

In humans, male gametes fuse with female gametes to fertilise in the female ovary. Fertilised sperm and egg form zygote which will divide repeatedly to form the embryo.

Very Short Answer Questions

11. Although 2 cells called gametes fuse, the product formed is a single cell called the zygote. Justify.

During fertilization, only the nucleus of the sperm gets implanted into the uterus to form a zygote. Then sperm degenerates. Hence fused cell is called gamete.

Stages in the lifecycle of silkworm are given below. Write them in sequential order.

12. Stages in the lifecycle of silkworm are given below. Write them in sequential order.

c)Silkmoth.

d)Silkworm.

13. What is the importance of reproduction?

Reproduction ensures the continuation of species from generation to generation.

14. In markets, eggs of birds are available but never eggs of dogs. Why?

Because the dog is viviparous. It does not lay an egg. It gives birth to a new one.

15. The eggs of frogs do not have shells for protection, yet they are safe in the water. How?

Jelly like covering on the eggs give the protection Hence frog’s eggs are safe in the water.

Short Answer Questions

16. Fill up the blanks with the terms given below:

Amoeba is a ___________ celled organism. It reproduces by ___________ reproduction. The process of reproduction begins by the division of its ___________ into two. This is followed by the division of its ___________ into two. This type of reproduction is called ___________ fission.

Amoeba is a single-celled organism. It reproduces by asexual reproduction. The process of reproduction begins with the division of its nucleus into two. This is followed by the division of its body into two. This type of reproduction is called binary fission.

17. The term metamorphosis is not used while describing human development. Why?

Because body parts of humans will be present by birth. Whereas in metamorphosis parts of adults are different from the young ones.

18. Mother gives birth to a baby but the baby has characters of both parents. How is this possible?

Though the mother gives birth to baby fertilization involves the fusion of gametes from both the parents. Hence character is obtained by both the parents.

19. How is reproduction in hydra different from that in amoeba?

Hydra reproduces by budding where a bud detaches from the parent which grows into a complete organism. Whereas amoeba reproduces by binary fission. The process of reproduction begins with the division of its nucleus into two. This is followed by the division of its body into two.

20. State whether the following statements are True or False. If false, correct the statement:

(a) External fertilisation can occur both in water and on land.

(b) The eggs of fish are covered by hard shells for protection.

(c) The human egg has a head, middle piece and tail.

(d) In adult human females, a single mature egg is released into an oviduct every month.

• False- External fertilisation can occur only in water.
• False- eggs of fish are covered by jelly-like substance for protection.
• False- Human sperm has a head, middle piece and tail.

21. Why do only male gametes have a tail?

Because sperm need to be motile to reach the non-motile egg in the ovary of the female.

22. What does Fig. 9.1 represent?

The figure shows Binary fission of amoeba with a dividing nucleus.

23. Observe the figure given as Fig. 9.2 and answer the questions that follow.

(a) Label A and B.

(b) Identify the process.

(c) What happens during this process and what is formed?

(a) A-sperm; B-ovum (egg)

(b) Fertilisation

(c) Sperm nucleus fuses with the egg nucleus to form the zygote.

Long Answer Questions

24. How can we say that fish exhibits external fertilisation?

Female fish releases eggs into the water and male fish releases sperm into the water. Sperm swim randomly in water to reach the egg. The nucleus of the sperm reaches the egg and fuses to form the zygote. Since fertilization takes place externally. It is called external fertilization.

After observing Fig. 9.3 answer the following.

a) Read the following statements and label them in the figure:

• The part which produces female gametes.
• The part where the development of the baby takes place.
• The part through which the developing embryo passes to reach the uterus.

b) Explain the future development of the embryo that would take place after it gets embedded in the uterus.

Developing embryo gets embedded in the wall of the uterus for further development. The embryo continues to develop in the uterus. It gradually develops body parts such as hands, legs, head, eyes, ears etc. The stage of the embryo in which all the body parts can be identified is called a foetus (Fig. 9.9). When the development of the foetus is complete, the mother gives birth to the baby.

26. Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.

In Hens internal fertilisation takes place. The fertilised egg develops inside the female body but the development of chick from the embryo takes place outside the body.

On the other hand in frogs both fertilisation and development of zygote to an embryo and young ones occurs outside the body.

27. Observe the following figures.

• Identify the stages a to d in Fig. 9.4 during the development of the human baby.
• Arrange the stages in the correct sequence of development.
• Explain the development that takes place in any one stage.

(i) The stages during the development of the human baby:

(a) Embedding of the embryo in the uterus.

(b) Fertilisation.

(c) Zygote formation and development of an embryo from the zygote.

(d) Zygote showing fusion of nuclei.

(ii) The correct sequence of development is:

(c) Zygote formation and development of an embryo from.

(iii) Zygote formation

The sperm and the egg nuclei fuse to form a single nucleus resulting in the formation of a fertilised egg or zygote.

As Biology has many concepts to grasp, students often face difficulty in memorising them. To ease your understanding, BYJU’S has come up with an innovative learning approach to help you learn and memorise Biology concepts. For all chapter-wise NCERT Solutions , Exemplar, previous years’ question papers, sample papers, video and animation lessons, download BYJU’S – The Learning App.

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• Class 8th /

Reproduction in Animals Class 8

• Updated on  
• Apr 21, 2021

Class 8 Science chapter on Reproduction in Animals elaborates on the major forms of reproduction in different animals. The mechanism of reproducing individuals of the same species is known as reproduction. A bulk of species replicate by mating, which increases genetic diversity. Males and females have gonads, which are independent sex organs. These gonads contain gametes, which combine together to form the zygote, a single cell. Earthworms, snails, slugs, and a few other species are hermaphrodites, meaning they have both male and female reproductive organs in the same body. Read this blog to find important study notes on Reproduction in Animals Class 10.

Must Read: Some Natural Phenomena Class 8

Table of contents

Modes of reproduction in animals, male reproductive organs, female reproductive organs, internal fertilization, external fertilization, embryo development, types of asexual reproduction.

The first section of Reproduction in Animals Class 10 talks about the forms of animal reproduction. There are various forms of reproduction depending on the number of parents involved. There are two forms of reproduction in animals:

• Sexual Reproduction
• Asexual Reproduction

Sexual Reproduction in Animals

Sexual reproduction is the result of male and female gametes fusing together to create a new organism. Let’s take a look at the human reproductive organs and how they help in fertility as per Class 8 chapter on Reproduction in Animals.

A pair of testes, two sperm ducts, and a penis are among the male reproductive organs. Sperm are male gametes formed by the testes. The testes contain millions of sperm, as shown in the illustration below of a sperm. Despite their tiny scale, sperm have a head, a middle section, and a tail. Each sperm is, in fact, a single cell with all of the normal cell components.

Moving to the next topic in Class 8 Reproduction in Animals, the female reproductive organs constitute a pair of ovaries, oviducts, and the uterus. Ovary creates ova, which are feminine gametes.  Per month, one of the ovaries releases a single matured egg into the oviduct in humans. The uterus is the area of the body where the baby develops. An egg is a single cell, much like sperm.

Also Read: Class 8 Reaching the Age of Adolescence

Fertilization

Fertilisation is another important topic you will study in Class 8 Reproduction in Animals. There are millions of sperm in the sperm. During fertilisation, a single sperm fuses with the ova. The egg and sperm nuclei join together to create a new nucleus. As a result, a zygote is formed.

There are two methods of fertilisation:

Internal fertilisation is the process of fertilisation that takes place within the female’s body. People, pigs, dogs, and other species are examples. In terrestrial animals, this approach is more common. Some marine species, however, also use this technique. This may happen either by the male directly injecting sperm into the female reproductive tract or by the male depositing sperm in the area, which the female picks up and injects into her reproductive tract.

They are three ways by which babies are produced by internal fertilization:

• Oviparity– The fertilised eggs are laid outdoors, where the yolk provides nutrition.
• Ovoviviparity– The fertilised eggs are stored in the female’s shell, where the yolk provides nourishment. Before the eggs are hatched, they are laid.
• Viviparity– Instead of hatching from the eggs, the offspring are born alive. The mother provides them with food. Mammals are examples of this.

External fertilisation refers to fertilisation that happens outside of the person. Frogs and fish, for example. The majority of fertilisation occurs during the spawning period. Spawning is triggered by environmental signals such as water temperature.

Oviparous and viviparous animals are two separate classes of animals categorised according to how they fertilise their offspring. The main difference between oviparous and viviparous animals are listed below:

The zygote separates into a ball of cells after repeated divisions. This is known as the developing embryo. These cells differentiate into respective tissues and organs. The embryo gets implanted in the uterine wall. This process is known as implantation.

A foetus is formed when all of the embryo’s body parts become apparent. In humans, the foetus develops after nine months.

Must Read: Cell Structure and Function Class 8

Asexual Reproduction in Animals:

Asexual reproduction is the second most common form of reproduction in animals, after sexual reproduction. Lower species and unicellular microbes are the most common examples of this form of reproduction.

It is the mechanism by which a new entity is created without the presence of the gamete formation by a single parent. Genetically and morphologically, the individuals produced are alike. It’s found in single-celled species. There is no fertilisation and the cells separate by mitotic division. The separation happens very fast.

Let’s take a look at the types of asexual reproduction as elaborated in Class 8 Reproduction in Animals:

Binary Fission Amoeba and euglena are examples of Binary Fission. The parent cell goes through mitosis and grows in size. The nucleus separates as well. Two equivalent daughter cells, each with a nucleus, are obtained. Binary fission is the most common form of reproduction for prokaryotes including bacteria.

Budding In this situation, the offspring emerges from the parent’s womb. When it matures, it stays bound to the parent. It separates from the parent after maturation and survives as a separate entity. Hydras use this method of reproduction the most.

Fragmentation When the body of an entity, such as a Planarian, splits into many parts, each piece develops into an independent offspring. Fragmentation is the term for this. It may happen as a result of predator-caused harm or as a natural form of reproduction. A fractured arm develops into a full organism in a few species, such as the sea star.

Regeneration It is a form of fragmentation that is found mainly in Echinoderms. When a part of an individual, such as an arm, splits from its parent body, it transforms into a different entity. This is referred to as regeneration.

Parthenogenesis This is an asexual reproduction method in which the egg forms without being fertilised. Bees, wasps, ants, aphids, rotifers, and other insects engage in this process. Hemiploid males are produced by ants, wasps, and bees. When females were separated from males, parthenogenesis was found in a few vertebrates such as hammerhead sharks, Komodo dragons, and blacktop sharks.

We hope that this blog has provided you with a deeper understanding of Class 8 Reproduction in Animals. Check out our Class 8 study notes section to find similar material for Class 8 subjects! Don’t forget to follow Leverage Edu on Instagram , Facebook and Twitter to stay updated with the latest educational news!

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