Question

Draw a well-labelled diagram showing germination of pollen on stigma of a flower.

Answer 1

Pollen germination:

1. The process of the landing of pollen on the stigma, pollen tube growth, and entry of germ cells in the ovule is the events covered in the germination of pollen grains.
2. The pollen grains attach to the stigma with a sticky surface and germinate to produce a tube.
3. This tube is known as the pollen tube.
4. The pollen tube carries the male gametes through the style to the ovary.
5. After reaching the ovary, the pollen tube enters the ovule through a pore called the micropyle.
6. The male gametes are then transferred to the embryo sac in the ovule, where they can fertilize the egg and polar nuclei.
7. The process of pollen germination on the stigma is shown below: