Question

what are the controversies about pollination

Answer 1

Pollination is the process by which pollen is
transferred to the female reproductive organs
of a plant, thereby enabling fertilization to
take place. Like all living organisms , seed
plants have a single major goal: to pass their
genetic information on to the next generation.
The reproductive unit is the seed, and
pollination is an essential step in the
production of seeds in all spermatophytes
(seed plants ).
For the process of pollination to be
successful, a pollen grain produced by the
anther , the male part of a flower, must be
transferred to a stigma , the female part of the
flower, of a plant of the same species. The
process is rather different in angiosperms
(flowering plants) from what it is in
gymnosperms (other seed plants). In
angiosperms, after the pollen grain has landed
on the stigma, it creates a pollen tube which
grows down the style until it reaches the
ovary. Sperm cells from the pollen grain then
move along the pollen tube, enter the egg cell
through the micropyle and fertilise it, resulting
in the production of a seed.