How do pollen grains reach the pistil?

Answer 1

The pollen grain reach the pistil either by self-pollination or by cross pollination by pollinators.

Answer 2

Pollen grains reach the pistil through pollination. The pollen grains are placed on the stigma of the carpal, and it transfers by wind, insects, built in mechanical discharge, and men. When the pollen lands on the stigma, it starts a series of chemical reactions that allow the pollen grain to produce a structure called the pollen tube. At the same time, the generative nucleus divides and produces two sperm nuclei. The pollen grain with the pollen tube and three nuclei is a mature gametophyte. The pollen tube works its way through the style of the carpal and touches the micropyte of the ovule. The sperm nuclei enter the embryo sac and fertilizes the egg and two polar nuclei, referred to as double fertilization. The fertilized egg develops into the immature seed plant, and the central cell develops into the endosperm, or food storage ares, of the seed.

Answer 3

Pollen grains are usually carried by wind, insects, birds, or other animals to reach the pistil of a flower. Once the pollen lands on the stigma of the pistil, it may travel down the style to reach the ovary where fertilization can occur.