Question

the condition where pollen grains fail to growth on the stigma on the same plant​

Answer 1

Answer:

In recent decades, incompatibility genes—which prevent pollen from germinating or growing into the stigma of a flower—have been discovered in many angiosperm species. If plants do not have compatible genes, the pollen tube stops growing. Self-incompatibility is controlled by the S (sterility) locus.

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Answer 2

Answer:

When the sexual incompatibility is between individuals of same species, it is intraspecific. This intraspecific incompatibility is also called as self-incompatibility which may include many reasons like pollen fail to germinate on the surface of the stigma of the same flower, which is also known as self-sterility.

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