Choose the most appropriate answer. Internal fertilisation occurs (i) in female body. (ii) outside female body. (iii) in male body. (iv) outside male body.

(a) Internal fertilization occurs – (i) in the female body.

Internal fertilization is a type of sexual fertilization. It is the union of an egg cell with a sperm during sexual reproduction inside the body of a female. For this process, male sperms are required to enter into the female reproductive system.

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

Metamorphosis is a biological process of physical change in an animal after its growth.

(c) The number of nuclei present in a zygote is – (ii) one.

A zygote is a fertilized egg formed after the union of male and female gamete. It has two nuclei contributed each by male and female gamete

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