Question

Longest pollen grain is found in which plant?

Answer 1

Pollen grain:

1. A pollen grain is a single cell that contains two male gametes. It is found within the anther of the flower.
2. A pollen grain on maturation gets released from the anther.

Longest pollen grain:

The longest pollen grain is found in the plant Zostera. It has pollen grains about $2500$ micrometer long.