Flowering plants have developed certain outbredding devices to discourage self-pollination and encourage cross-pollination. One of these is not an examples of such outbreeding device.

Options

A. Dicliny
B. Dichongamy
C. Herkogamy
D. Cleistogamy

Answer

D

Explanation

Clesitogamous flowers are intersexual. They remain closed causing self pollination. Cleistogamy occurs late in the flowering season in some plants, e.g., Commelina, balsam, Oxalis, Viola. These plants possess both chamogamous and cleistogamous flowers. in cleistogamous flowers, the anthers dehisce inside closed flowers. Growth of style brings the pollen grains in contact with stigma. cleistogamy ensures self-pollination.