Question

What is pollination? What happens to plants after pollination?

Answer 1

the presence in or introduction into the environment of a substance which has harmful or poisonous effects.
plants will get harm

Answer 2

Only after pollination, when pollen has landed on the stigma of a suitable flower of the same species, can a chain of events happen that ends in the making of seeds. A pollen grain on the stigma grows a tiny tube, all the way down the style to the ovary. ... The ovary develops into a fruit to protect the seed.