Question

Explain the natural devices by which autogamy is prevented ??

Answer 1

Majority of flowering plants produce hermaphrodite flowers and pollen grains are likely to come in contact with the stigma of the same flower. Continued self-pollination result in inbreeding depression. Flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. In some species, pollen release and stigma receptively are not synchronized. Either the pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of pollen. In some other species, the anther and stigma are placed at different positions so that the pollen cannot come in contact with the stigma of the same flower. Both these devices prevent autogamy.

Answer 2

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word autogamy mean self fertilization. this is a special type of self pollination in which an intersexual or top flower is pollinated through its own pollen. Autogamy is only possible when anther and stigma are close to each other and which has synchrony in pollen release and stigma respectively. It is frequently meet in unicellular organisms such as protozoan, protist.

autogamy in plant :- the plant which is capable to fertilize themselves rather than hybridize with another plants.

Autogamy occurs by three method:-

Namely-homogamy

Cliestogamy

Bud pollination