NCERT Solutions for Class 8 Science Science - NCERT Solution Chapter 9

Reproduction in Animals Class 8

Chapter 9 Reproduction in Animals Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 110

Q1 :  

Explain the importance of reproduction in organisms.


Answer :

Reproduction is a biological process through which living organisms produce offspring similar to themselves. Living organisms reproduce to maintain their number and for the continuation of their species. Thus, reproduction ensures the continuation of similar kinds of individuals.

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Q2 :  

Describe the process of fertilization in human beings.


Answer :

Fertilization involves the fusion of the male and the female gamete. The male and the female gametes are released from the male and the female reproductive organs. Sperms or male gametes are released from the male reproductive organ i.e., the penis. These sperms then enter the female body through the vagina. Then, they travel through the fallopian tubes where they meet the eggs. Hence, the process of fertilization takes place in the fallopian tubes.

During fertilization, the haploid nucleus of the sperm and that of the ovum fuse with each other to form the zygote. This zygote divides to form an embryo which in turn develops into a foetus.

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Q3 :  

Choose the most appropriate answer.

(a) Internal fertilization 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) fertilization

(ii) metamorphosis

(iii) embedding

(iv) budding

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

(i) none

(ii) one

(iii) two

(iv) four


Answer :

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Q4 :  

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 fertilization takes place in frogs. ( )

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

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

(f) Amoeba reproduces by budding. ( )

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

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

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

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


Answer :

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Q5 :  

Give two differences between a zygote and a foetus.


Answer :

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Q6 :  

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


Answer :

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Q7 :  

In which female reproductive organ does the embryo get embedded?


Answer :

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Q8 :  

What is metamorphosis? Give examples.


Answer :

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Q9 :  

Differentiate between internal fertilization and external fertilization.


Answer :

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Q10 :  

Complete the crossword puzzle using the hints given below.

Across

1. The process of the fusion of the gametes.

6. The type of fertilization 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 fertilized egg.

4. These animals lay eggs.

5. A type of fission in amoeba.

v


Answer :

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Science - NCERT Solution - Science : CBSE NCERT Exercise Solutions for Class 8th for Reproduction in Animals will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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