Question

what happens when a pollen grain falls on a stigma?

Answer 1

Only after pollination, when pollen has landed on the stigma of a suitable flower of the same species, can a chain of events happenthat 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.

Answer 2

only after pollination pollen landed on stigma
a pollen grain on stigma forms a tiny tube all the way style down the ovary .
the ovary develops into fruit to protect the seed