33.Unisexuality of flowers prevents A. Autogamy and Geitonogamy B. Both geitonogamy and xenogamy C. Autogamy but not geitonogamy D. Geitonogamy but not xenogamy
Option C A unisexual flower is a flower that contains three whorls such as petals, sepals, the male reproductive structure (stamen) or the female reproductive structure (pistil). Autogamy is pollination by the transfer of pollen grains from the anther of a flower to the stigma of the same flower. Geitonogamy is the pollination by transfer of pollen grains from the anther of a flower to the stigma of another flower of the same plant. Thus, a unisexual flower cannot show autogamy but geitonogamy is possible. Hence, the unisexuality of flowers that is the presence of either stamens or carpels can prevent autogamy but not geitonogamy.
