NCERT Solutions For Class 8 Science Chapter 9 Reproduction in Animals

Class 8 Science Chapter 9 Reproduction in Animals

NCERT Solutions For Class 8 Science Chapter 9 Reproduction In Animals, (Science) exam are Students are taught thru NCERT books in some of state board and CBSE Schools.  As the chapter involves an end, there is an exercise provided to assist students prepare for evaluation.  Students need to clear up those exercises very well because the questions withinside the very last asked from those. 

Sometimes, students get stuck withinside the exercises and are not able to clear up all of the questions.  To assist students, solve all of the questions and maintain their studies without a doubt, we have provided step by step NCERT Solutions for the students for all classes.  These answers will similarly help students in scoring better marks with the assist of properly illustrated Solutions as a way to similarly assist the students and answering the questions right.

NCERT Solutions For Class 8 Science Chapter 9 Reproduction in Animals

Class 8 Science Chapter 9 Reproduction in Animals

Exercise Questions

1. Explain the importance of reproduction in organisms.


Importance of reproduction in organisms is as follows

  • Reproduction is termed to be a biological process in which organisms give birth to their off springs.
  • It helps in maintaining the continuity of a particular race and helps in increasing the population of the species.
  • Reproduction is meant for the survival of all living things.

2. Describe the process of fertilisation in human beings.


  • Fertilization is defined as the process in which there is a fusion of male gamete and female gamete.
  • The male gametes or sperms are released from the male reproductive organ called the penis.
  • The sperms release and enter the female body through the vagina.
  • From the vagina, sperms travel through the fallopian tubes where they meet the eggs.
  • From there on, the process of fertilization takes place in the fallopian tube.
  • The male gamete cell (sperm) and female gamete cell (egg) fuse together to form a zygote.
  • The zygote divides rapidly to form a group of cells called morula, which becomes the embryo after approximately five days. The foetus is present for about eight weeks after the fertilization.

3. Choose the most appropriate answer.

(a) Internal fertilisation occurs

(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

(i) fertilisation

(ii) metamorphosis

(iii) embedding

(iv) budding

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

(i) none

(ii) one

(iii) two

(iv) four


a) (i) in female body.

b) (ii) metamorphosis

c) (iii) two

4. Indicate whether the following statements are True (T) or False (F).

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

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

(c) External fertilisation takes place in frog. ( )

(d) A new human individual develops from a cell called gamete. ( )

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

(f) Amoeba reproduces by budding. ( )

(g) Fertilisation is necessary even in asexual reproduction. ( )

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

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

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


a) False

b) True

c) True

d) False

e) True

f) False

g) False

h) True

i) True

j) False

5. Give two differences between a zygote and a foetus.



  • It is the earliest stage of development
  • It is formed by the fusion of male and female gametes
  • It is a single cell
  • The zygote divides several times to form an embryo
  • The zygote normally lasts a week and then develop into its next stage.


  • It is the last developmental stage of an organism
  • The stage of the embryo that shows all the main recognizable body parts of a mature organism.
  • The foetus stage occurs after the embryo stage.
  • Foetus mainly undergoes internal development.

6. Define asexual reproduction. Describe two methods of asexual reproduction in animals.


In this type of reproduction, the offspring arises from a single organism without the fusion of male and female gametes. It never changes the number of chromosomes.

Binary fission in amoeba

  • It is a kind of asexual reproduction in which one cell divides into two halves.
  • It is a unicellular organism that has a cell membrane, cell wall and cytoplasm.
  • The division of the cell can take place on any plane.
  • In this process, the nucleus of the amoeba first divides to form two daughter nuclei by the process called Karyokinesis.
  • Finally, the division of the body into two halves having a nucleus respectively takes place.

Budding in hydra

  • Organisms such as hydra, use regenerative cells for reproduction in the process of budding.
  • The first step is the formation of buds, and it develops as a small outgrowth on the parent’s body.
  • As the bud enlarges, it receives the characteristics of the parent organism.
  • Once it is developed, it may be detached from the parent body and develop into a new individual.
  • In some rare cases, the buds may not be detached forming interconnected buds.
  • There are also methods like fragmentation, multiple fission etc.

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


  • In the female reproductive organ, the embryo gets attached to the uterus.
  • Once it gets attached, there occurs the formation of body parts like legs, hands, eyes etc.
  • The embryo is then called a foetus.

8. What is metamorphosis? Give examples.


  • It is defined as the process in which an animal’s body structure abruptly changes through cell growth and differentiation.
  • It is a biological process.
  • Examples of this kind are frog and insects.

The life cycle of a frog:

The tadpole emerging from the egg will have gills, tail, etc.

They can swim easily in water.

It undergoes abrupt changes and develops into a mature frog.

9. Differentiate between internal fertilisation and external fertilisation.


Fertilization, in general, is defined as the fusion of a male and a female gamete.

Internal fertilization

It occurs inside the female body.

There are high chances of survival of the offspring.

Internal fertilization protects the fertilized egg or embryo from harsh environments.

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

External fertilization

It occurs outside the female body.

There are low chances of survival of the offspring.

Most aquatic animals use this type of fertilization and the advantage of external fertilization is that it produces a large number of offspring due to external hazards.

Examples are fish, frog, organisms etc.

10. 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 in vitro fertilisation.

4. These animals lay eggs.

5. A type of fission in amoeba



1) Fertilization

6) Internal

7) Buds

8) Ovary


2) Testis

3) Zygote

4) Oviparous

5) Binary

Benefits of NCERT Solutions for Class 8

NCERT Solutions for Class 8 contains extremely important points, and for each chapter, each concept has been simplified to make it easier to remember and increase your chances of achieving excellent exam results. Exam Preparation References Here are some tips on how these Solutions can help you prepare for the exam.

  1. This helps students solve many of the problems in each chapter and encourages them to make their concepts more meaningful.
  2. NCERT Solutions for Class 8 encourage you to update your knowledge and refine your concepts so that you can get good results in the exam.
  3. These NCERT Solutions For Class 8 are the best exam materials, allowing you to learn more about your week and your strengths. To get good results in the exam, it is important to overcome your weaknesses.
  4. Most of the questions in the exam are formulated in a similar way to NCERT textbooks. Therefore, students should review the Solutions in each chapter in order to better understand the topic.
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Tips & Strategies for Class 8 Exam Preparation

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  2. Please refer to the NCERT Solutions available on the cbsestudyguru website to clarify your concepts every time you prepare for the exam.
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  6. Practice an ample number of question papers to make your concepts stronger. 
  7. Take rest and a proper meal.  Don’t stress too much. 

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