Ncert Exercises & Solutions

Q. 4 Does self-incompatibility impose any restrictions on autogamy? Give reasons and suggest the method of pollination in such plants.

Self-incompatibility imposes restrictions on autogamy. The season for this may be as Majority of flowering plants produce hermaphrodite flowers and when pollens grains come in contact with the stigma of the same flower to continue self-pollination.

Such type of continued self-pollination results in inbreeding depression. That's why flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. One of the major ways to prevent self-pollination is self-sterility.

Self-sterility in some bisexual flowers, if the pollen grains fall on the stigma of the same flower, germination does not occur. But the same pollen grains germinate when they fall on the stigma of other flowers of the same species. It is a genetic mechanism to prevent self-pollination.

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