what happens when a pollen grain reaches the stigma?explain it with a diagram



When the pollen grain is deposited on the stigma it starts to germinate and the pollen tube grows up through the pistil of the female flower until it reaches the ovary and fertilisation occurs. after the pollen lands on suitable stigma, it has to reach the female germ cells which are in ovary. for this, a tube grows out of pollen grains and travel through style to reach the ovary.
 

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