(Gk. Auto = self and gamos = marriage):

It is a type of pollination in which the pollen from the anthers of a flower is transferred to the stigma of similar flower. It takes place by three techniques.

(i) Cleistogamy: (Gk. Kleisto = closed and Gamos = marriage):

Certain plants never open to make sure complete self-pollination. This situation is termed as cleistogamy, example: Oxalis, Commelina bengalensis, Viola, and so on. The cleistogamous flowers are bisexual small, colorless, inconspicuous, and do not secrete nectar.

(ii)  Homogamy:

Stigma and Anthers of bisexual flowers of certain plants mature at similar time. They are brought close to each other by growth, bending or folding to make sure self pollination. This condition is termed as homogamy, example: Mirabilis (Four O. clock), Catharanthus (i.e., Vinca), Potato, Sunflower, and so on.

(iii) Bud Pollination:

Stigma and Anthers of the bisexual flowers of certain plants mature before the opening of the buds to make sure self-pollination, example: Wheat, Pea, Rice, and so on.

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