Solution of Chapter 9. Reproduction in Animals (NCERT - Science Book)

Explain the importance of reproduction in organisms.

Describe the process of fertilization in human beings.

Choose the most appropriate answer.

Internal fertilization occurs

(i) in female body.

(ii) outside female body.

(iii) in male body.

(iv) outside male body.

Choose the most appropriate answer.

A tadpole develops into an adult frog by the process of

(i) fertilization

(ii) metamorphosis

(iii) embedding

(iv) budding

Choose the most appropriate answer.

The number of nuclei present in a zygote is

(i) none

(ii) one

(iii) two

(iv) four

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. ( )

Give two differences between a zygote and a foetus.

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

In which female reproductive organ does the embryo get embedded?

What is metamorphosis? Give examples.

Differentiate between internal fertilization and external fertilization.

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 the 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.