Question

What is meant by autogamy and allogamy

Answer 1

Autogamy− It is the transfer of pollen grains from the anther to the stigma of the same flower. Autogamy requires the anther and the stigma to lie close. It also requires synchrony in the pollen release and stigma receptivity.
Plants like Viola, Oxalis, etc., produce two kinds of flowers—chasmogamous flowers(with exposed anther and stigma) and cleistogamous flowers (which do not open at all and only autogamy occurs).
Allogamy:is the transfer of pollen grains from the anther to the stigma of a different plant. Pollination causes genetically different types of pollens to be brought to a plant.