NCERT Solutions for Class 8 Science Chapter 9 – Reproduction in Animals

NCERT Solutions for Class 8 Science Chapter 9 – Reproduction in Animals are a very useful study resource for students preparing for exams. These solutions explain every concept from the chapter in a clear and simple way, making it easier for Class 8 students to understand topics like sexual reproduction, asexual reproduction, fertilization, and the reproductive system in animals.

Prepared by subject experts as per the latest CBSE Class 8 Science syllabus, these solutions include answers to all exercise questions from the NCERT textbook. Students can use them to revise important topics, practice questions, and score better marks in exams.

With Infinity Learn’s NCERT Solutions for Class 8 Science Chapter 9, students can also download a free PDF for revision. These solutions help learners build strong fundamentals in Science, prepare for school tests, and gain confidence in answering different types of exam questions.

NCERT Solutions for Class 8 Science Chapter 9 – Free PDF Download

Need help with Class 8 Science Chapter 9 – Reproduction in Animals? This chapter explains in detail how animals reproduce and continue their species. With our NCERT Solutions for Class 8 Science Chapter 9 question answers, students can understand important concepts like asexual reproduction, sexual reproduction, and fertilization in a simple way. You can also download the free PDF of Reproduction in Animals Class 8 questions and answers to revise quickly and improve your exam preparation.

Reproduction in Animals Class 8 NCERT Solutions Chapter 9

Ques 1. Explain the importance of reproduction in organisms.

Ans.

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

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

Ans.

1. In human beings fertilization takes place inside the female body (internal fertilization).
2. Males eject sperms inside female bodies
3. Out of millions of sperms produced, one sperm will fuse with the egg cell.
4. This process in which the ovum and sperm fuse to form zygote is called
5. 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.

Across :

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.

          Down :

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.

A.

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

Ans.

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 :

1. In this method, a part of an organism starts bulging out. This is called
2. 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 easy to get the NCERT Solutions for Reproduction in Animals Class 8 Chapter 9 PDF. This chapter in Class 8 Science explains interesting topics about how animals reproduce, with diagrams showing different ways of reproduction in animals.

The included assignments help students practice and improve their exam scores. Since Biology is mostly theory, it can be hard to remember everything. Our Class 8 Science Chapter 9 question answers use simple learning techniques to make it easier to understand and memorize key ideas from Reproduction in Animals Class 8 questions and answers.

Reproduction in Animals class 8​ 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

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Class 8 Reproduction in Animals Extra Questions

A) Short Answer Type Questions (2–3 marks)

1. What is reproduction? Why is it important for a species?
   Ans: Reproduction is the process by which living things make young ones like themselves. It keeps a species going from one generation to the next.
2. Name the main male and female reproductive cells in humans.
   Ans: Male cell: sperm; Female cell: ovum (egg).
3. What is fertilization? Where does it usually happen in humans?
   Ans: Fusion of sperm and egg to form a zygote; it usually happens in the oviduct (fallopian tube).
4. Differentiate between oviparous and viviparous animals with one example each.
   Ans:Oviparous lay eggs (hen). Viviparous give birth to young ones (cow).
5. State two differences between sexual and asexual reproduction.
   Ans: Sexual: needs two parents; offspring show variation. Asexual: one parent; offspring mostly identical.
6. What is metamorphosis? Give one example.
   Ans: Big body changes from young to adult; e.g., tadpole to frog.
7. Write one function each: uterus and placenta.
   Ans:Uterus: protects and nourishes the embryo. Placenta: helps exchange food, oxygen, and wastes between mother and foetus.
8. Name two asexual modes in animals studied in Class 8.
   Ans:Budding (Hydra) and binary fission (Amoeba).
9. Why are testis and ovary called primary reproductive organs?
   Ans: They produce gametes (sperms/ova) and hormones.
10. What is external fertilization? Name one animal showing it.
    Ans: Fusion of gametes outside the body (often in water), e.g., frog.

B) Long Answer Type Questions (4–5 marks)

1. Describe the human female reproductive system and its functions.
   Ans:

• Ovary: makes ova and hormones.
• Oviduct (fallopian tube): site of fertilization; carries egg/zygote.
• Uterus: embryo attaches and grows; foetus develops.
• Vagina: birth canal.
  Together, they help in fertilization, protection, and birth.

1. Explain the steps from fertilization to the birth of a baby.
   Ans: Sperm meets egg in oviduct → zygote forms → divides to form embryo → embryo implants in uterus wall → develops with help of placenta → grows into foetus → birth.
2. Compare budding in Hydra and binary fission in Amoeba.
   Ans:Budding: a small outgrowth (bud) forms on parent → develops → detaches as new Hydra. Binary fission: Amoeba’s nucleus divides → cytoplasm splits → two daughters; no bud forms.
3. Explain internal vs external fertilization with advantages/risks.
   Ans:Internal: inside body (humans) → better protection; fewer eggs. External: outside (frogs) → many eggs but low survival due to predators/environment.
4. ‘Variation is more in sexual reproduction than in asexual reproduction.’ Explain.
   Ans: Sexual reproduction mixes traits from two parents, causing more variation. Asexual uses one parent, making identical offspring.
5. What is the role of placenta? How does it keep the foetus safe?
   Ans: Placenta connects foetus to mother; nutrients and oxygen move to foetus; wastes move back. It does not mix blood directly and helps protect the foetus.

C) Assertion–Reason Questions (choose a/b/c/d)

(a) Both A and R are true, and R explains A
(b) Both true, but R doesn’t explain A
(c) A is true, R is false
(d) A is false, R is true)

1. A: Humans are viviparous.
   R: Humans give birth to young ones after development inside the mother.
   Ans: a
2. A: External fertilization is common in frogs.
   R: Their eggs and sperms are released in water.
   Ans: a
3. A: Asexual reproduction always needs two parents.
   R: In budding, the bud comes from two different parents.
   Ans: d (A false, R false)
4. A: Fertilization in humans usually happens in the oviduct.
   R: The oviduct is where sperm and egg can meet.
   Ans: a
5. A: Oviparous animals lay eggs.
   R: Hen is an example of an oviparous animal.
   Ans: b (both true; R is an example, not the explanation)
6. A: Offspring formed by asexual reproduction are mostly identical to the parent.
   R: There is no mixing of genetic material from two parents.
   Ans: a
7. A: Metamorphosis happens in frogs.
   R: A frog directly gives birth to a baby frog.
   Ans: c (A true, R false)
8. A: Placenta helps in exchange of materials between mother and foetus.
   R: Mother’s and foetus’ blood are the same.
   Ans: c (A true, R false)

D) Application-Based Questions

1. Flow chart fill-in: Sperm + Egg → ______ → embryo → ______ (attach site) → foetus.
   Ans:Zygote; uterus
2. Scenario: A fish lays hundreds of eggs in water. Only a few survive. Which fertilization is this and why are many eggs laid?
   Ans:External fertilization; many eggs increase chance that some survive.
3. Reasoning: A student says, “All egg-laying animals live on land.” Correct the statement with examples.
   Ans: Wrong; many aquatic animals (fish, frogs) lay eggs in water.
4. Label the steps: (i) Bud grows on Hydra, (ii) Bud detaches, (iii) New Hydra forms. Arrange in correct order.
   Ans:(i) → (iii) → (ii) (bud grows → develops into new → detaches)
5. Think: Why does internal fertilization usually produce fewer eggs than external fertilization?
   Ans: Because inside protection increases survival; fewer eggs are needed.
6. Case study: In a report, the oviduct is blocked. Which step of reproduction is affected and why?
   Ans:Fertilization, because sperm and egg cannot meet in the oviduct.

MCQs on Reproduction in Animals Class 8 with Answers

These Class 8 Reproduction in Animals MCQs will help students revise quickly and practice objective questions. Each MCQ is designed as per the latest NCERT Class 8 Science Chapter 9 syllabus.

Multiple Choice Questions (MCQs)

Q1. Which of the following is an oviparous animal?
(a) Dog
(b) Cow
(c) Hen
(d) Cat
Answer: (c) Hen

Q2. Where does fertilization normally occur in humans?
(a) Ovary
(b) Uterus
(c) Oviduct (fallopian tube)
(d) Vagina
Answer: (c) Oviduct (fallopian tube)

Q3. Which of the following reproduces by budding?
(a) Amoeba
(b) Hydra
(c) Fish
(d) Frog
Answer: (b) Hydra

Q4. Which reproductive cell is motile (able to move)?
(a) Sperm
(b) Ovum
(c) Zygote
(d) Embryo
Answer: (a) Sperm

Q5. What is the full form of IVF used in reproduction?
(a) Internal Viviparous Fertilization
(b) In Vitro Fertilization
(c) Internal Vascular Fertilization
(d) In Vivo Fertilization
Answer: (b) In Vitro Fertilization

Q6. Which of the following is an example of asexual reproduction?
(a) Fertilization in frog
(b) Budding in Hydra
(c) Birth of calf from cow
(d) Foetus development in humans
Answer: (b) Budding in Hydra

Q7. Which one of these animals shows external fertilization?
(a) Human
(b) Dog
(c) Frog
(d) Cat
Answer: (c) Frog

Q8. In which organ does the foetus develop in humans?
(a) Ovary
(b) Testis
(c) Uterus
(d) Placenta
Answer: (c) Uterus

Q9. Which process is defined as the fusion of sperm and egg?
(a) Fertilization
(b) Metamorphosis
(c) Budding
(d) Binary fission
Answer: (a) Fertilization

Q10. Which one of the following is NOT an asexual method of reproduction?
(a) Binary fission
(b) Budding
(c) Spore formation
(d) Fertilization
Answer: (d) Fertilization

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.