In plants with self-incompatibility

Easy

A

the pollen grains of a flower can not reach the stigma of same flower.
B

the pollen grains of another flower of the same plant can not reach the stigma of a flower
C

pollen grains of the same flower as well as other flowers of the same plant fail to germinate on the stigma of a flower or pollen tube growth is inhibited at the stigma as well as in the style.
D

only unisexual flowers are seen.

Solution

In the mechanism of self-incompatibility, though the pollen grains or the same flower of different flower of the same plant are deposited on the stigma of a flower, the pollen grains either not allowed to germinate or the growth of the pollen tube is hindered at the stigma as well as style level to avoid the male gametes to be involved in fertilizing the embryo sac of the flower.

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