Name the process of the fusion of gametes.

Read the given statements and choose the correct statements among the following. I. Apogamy is the process which involves fusion of gametes.,br>II. Fusion of two dissimilar gametes is called anisogamy. III. Fusion of large motile gametes and small non-motile gamete is oogamy. IV. Fusion of morphologically similar gametes is called isogamy.

"Incompatibility is a natural barrier in the fusion of gametes". Justify the statement.

A type of reproduction, where fusion of gametes occurs is called:

Assertion (A): Sexual reproduction increases genetic diversities and plays a role in origin of new species. Reason ( R): Sexual reproduction involves formation of gametes and fusion of gametes.

The process of nuclear fusion to form zygote is called..........