Question

a thin tube sent out after pollination into the pistil from the pollen grains​

Answer 1

Answer:

$pollen \ grains$

The pollen tube acts as a conduit to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms. ... They are used as a model for understanding plant cell behavior.