question_answer 9)

What is self-incompatibility? Why does self-pollination not lead to seed formation in self-incompatible species?

Answer:

When inspite of viable pollens they are unable to germinate on the stigma of the same flower it is called self incompatibility and this leads to cross pollination e.g., radish. Self-pollination cannot lead to formation of seeds in self-incompatible species because in such flowers the pollens are unable to fertilize the ovule to form embryo and hence seeds.