. Mention two strategies evolved to prevent self-pollination in flowers.


Best Answer

Continued self-pollination decreases the vigour and vitality of a particular race. Thus, flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. Dichogamy and self-sterility are. Two most common devices that ensure cross-pollination. Dichogamy - Maturation of anther and stigma at different times in a bisexual flower prevent self-pollination. Self-sterility (or self-incompatibility) - Due to the presence of self-sterile gene in some flowers, pollen grains do not germinate on the stigma of that flowers, e.g.,- tobacco, potato.

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