Question

Why do some pollen grains fail to germinate?

Answer 1

Pollen grains:

1. Pollen grains are male reproductive cells that help in the transfer of male gametes.
2. Germination of pollen grains involves the landing of pollen on the stigma, growth of pollen tube, and male germ cell entry into the ovule.
3. The pollen grain attaches to the stigma and only compatible pollens are allowed to germinate.
4. Some pollen grains fail to germinate if the required parameters to conduct germination are absent.
5. Pollen grains of other species are rejected and germination is prevented.