From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

Options

A. Monoecious plant bearing unisexual flowers
B. Dioecious plant bearing only male or female flowers
C. Monoecious plant with bisexual flowers
D. Dioecious plant with bisexual flowers

Answer

B

Explanation

Dioecious plants (bearing only male or female flowers) prevent both autogamy and geitonogamy. Autogamy is a method of self-pollination in which the transfer of pollen grains from anther to stigma of the same flower takes place. Geitonogamy is the transfer of pollen grains from anther to stigma of another flower of the same plant. It is ecologically crosspollination which is supposed to be equivalent to self-pollination because all flowers on a plant are genetically identical.