Question

Although 2 cells called gametes fuse, the product formed is a
single cell called zygote. Justify.


NCERT Class VIII
Science - Exemplar Problems

Chapter 9. Reproduction in Animals

Answer 1

Thanks for asking the question.
Two gametes fuse to form a single cell called zygote by the process of fertilization. It happens as the sperm moves towards the egg. Only the nucleus of the sperm penetrates further in the egg to fuse with its nucleus whereas the rest of the sperm degenerates. Hence zygote is a single cell containing nucleus of both egg and the sperm.
Hope it helps.

Answer 2

Explanation:

This is because dogs are viviparous animals and don't give birth in the form of eggs while birds are oviparous animals and give birth through eggs