Question

how does the pollen grains help the plants?

Answer 1

In flowering plants, transport is done mostly by insects and other animals. Bees are certainly one of the most important pollinators in the plantworld. The pollen gets stuck on their legs, and as they move to another flower, the tiny grains stick to the stigma of that flower.

Answer 2

Pollen grains play a vital role in the reproductive process of plants

reproduction of plants by
pollen
Pollen is a fine to coarse powdery substance comprising pollen grains which are male microgametophytes of seed plants, which produce male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametophytes during the process of their movement from the stamens to the pistilof flowering plants or from the male coneto the female cone of coniferous plants. If pollen lands on a compatible pistil or female cone, it germinates, producing a pollen tube that transfers the sperm to the ovule containing the female gametophyte. Individual pollen grains are small enough to require magnification to see detail. The study of pollen is called palynology