Question

Give details of two different ways in which a zygote develops in case of animals where fertilization is internal.

Answer 1

Two different ways in which a zygote develops in case of animals where fertilization is internal are :

1. 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.

2. 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.