Reproduction In Animals

Class 6 - Reproduction in Animals: Questions and Answers

1. Explain the importance of reproduction in organisms.

Reproduction helps living things to continue their species. It produces new individuals and helps in the survival of the species.

2. Describe the process of fertilisation in human beings.

Fertilisation happens when a male sperm joins with a female egg inside the female body, forming a zygote which grows into a baby.

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

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

(a) Oviparous animals give birth to young ones. (F) - They lay eggs.

(b) Each sperm is a single cell. (T) - Sperm is a tiny single cell.

(c) External fertilisation takes place in frog. (T) - Fertilisation happens outside the body.

(d) A new human individual develops from a cell called gamete. (F) - It develops from a zygote.

(e) Egg laid after fertilisation is made up of a single cell. (F) - It starts dividing into many cells.

(f) Amoeba reproduces by budding. (F) - Amoeba splits, not buds.

(g) Fertilisation is necessary even in asexual reproduction. (F) - Asexual reproduction does not need fertilisation.

(h) Binary fission is a method of asexual reproduction. (T) - It splits into two new organisms.

(i) A zygote is formed as a result of fertilisation. (T) - Zygote forms after sperm meets egg.

(j) An embryo is made up of a single cell. (F) - An embryo has many cells.

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

- Zygote is a single cell; foetus has many cells.
- Zygote is the first stage after fertilisation; foetus is a baby growing in the womb.

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

Asexual reproduction means forming new organisms without fertilisation.
- Binary fission: One cell splits into two.
- Budding: A part grows and breaks off to form a new one.

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

The embryo gets embedded in the uterus, where it grows and becomes a baby.

8. What is metamorphosis? Give examples.

Metamorphosis is a big change in body shape as animals grow.
- Example: Tadpole becomes frog, caterpillar becomes butterfly.

9. Differentiate between internal fertilisation and external fertilisation.

- Internal fertilisation: Happens inside the body (e.g., humans).
- External fertilisation: Happens outside the body (e.g., frogs).