Question

the stigma is the structure which receive the pollen grains stimulates the pollen grain to germinate and reach the ovary​

Answer 1

Once the pollen grain is recognized and hydrated, the pollen grain germinates to grow a pollen tube. There is competition in this step as many pollen grains may compete to reach the egg. The stigma plays a role in guiding the sperm to a receptive ovule, in the case of many ovules.

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