Q.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) Internal fertilisation occurs
(i) in female body.

b) A tadpole develops into an adult frog by the process of
(ii) metamorphosis

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

EXPLANATION

a) Internal fertilization is the fusion of an egg/ova and sperm cell during sexual reproduction inside the female body.

b) Metamorphosis is a biological process which involves sudden and abrupt changes in the body structure of the animal by growth using cell division and differentiation.

c) Though zygote is a single cell, but it has two nuclei as it contain one nuclei from the sperm and one nuclei from the egg/ova.