question_answer 60)

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

Answer:

                  Self-incompatibility imposes restrictions on autogamy. The season far this may be asMajority of flowering plants produce hermaphrodite flowers and when pollens grains comesin contact with the stigma of the same flower to continue self-pollination.Such type of continued self-pollination result in inbreeding depression. That's why floweringplants have developed many devices to discourage self-pollination and to encouragecross-pollination. One of the majorway to prevent self-pollination is self-sterility.Self-sterility in some bisexual flowers, if the pollen grains fall on the stigma of the sameflower, germination does not occur. But the same pollen grains germinate when they fall onthe stigma of other flowers of the same species. It is a genetic mechanism to preventselfpollination.