Question

Why does pollen grain of one species grow only on stigma of same species flower?
detailed answer​

Answer 1

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1. The transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant is called geitonogamy.
2. This transfer involves an agent of pollination.
3. Pollen grains of other species are not compatible and do not germinate on the stigma of a flower of different species.
4. A number of pollen tube of the same species can grow into a style.
5. A pollen grain germinates and the pollen tube grows down the style toward the ovary.

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