Unisexuality of flowers prevents

Options

A. Geitonogamy, but not xenogamy
B. Autogamy and geitonogamy
C. Autogamy, but not geitonogamy
D. Both geitonogamy and xenogamy

Answer

C

Explanation

Unisexuality of flowers prevents autogamy as it involves transfer of pollen grains from anther to stigma of same flower but not geitonogamy because it involves the transfer of pollen grains from anther of one flower to stigma of another flower of same plant.