Answer:
In over 60 % of angiosperms, pollen grains
are shed at this 2-celled stage tube cell orvegetative cell generative cell. In
the remaining species, the generative celldividesmitotically to give rise to
the two male gametes before pollen grains are shed tubecell orvegetative cell
two male gamete 3-celled stage.
In 3 celled stage, the pollen grains
further germinate on the stigma to produce pollen tubethrough one of the germ
pores. The contents of the pollen grains move into the tube pollentube grows
through the .tissues of the stigma and style and reaches to ovary.
Inplants, when pollen grainare
shed at 2 celled stage the generative cell divides and formtwo male gametes
during the growth of the pollen tube in the stigma.
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