Question

give details of two different ways in which they got develop in case of animal where fertilization is internal

Answer 1

(i) Internal fertilization in earthworm: An earthworm , though a hermaphrodite, does not fertilize itself. Two earthworms come in contact with each other and exchange sperms. The eggs are fertilized internally with the sperms

received from the partners. Thus, a zygote is developed.

(ii) Internal fertilization in human: In human fertilization takes place on meeting of male and female gamete inside body. Fertilization is internal, and the development of the zygote into a fully formed individual also occurs inside the body of the female.