Study the diagram given below

What happens to the label A which falls on a suitable stigma?

Options

A. Pollen grain gradually disintegrates.
B. Pollen grain directly reaches the embryo sac.
C. Pollen grain starts germinating and forms a pollen tube.
D. Pollen grain changes into ovules and then to fruit.

Answer

C

Explanation

The part labelled A is pollen. The pollen grain starts germinating and forms a pollen tube. The pollen tube grows into the style till it reaches the ovule through micropyle. The pollen tube then reaches the embryo sac into which it releases the two, male gametes contained in it. The male gamete then fuses with the female gamete in the embryo sac.