Mention two strategies evolved to prevent self-pollination in flowers.
Explanation The process of self-pollination may be avoided in flowers using the following strategies: Dichogamy is a situation (in monoecious plants and hermaphrodite flowers) in which the male and the female flowers mature at different times. Therefore, the stigma is not receptive when the pollen is released, i.e. the stamens get ripened before the pistils (protandry). In another situation of dichogamy, the stigma may be receptive but the pollen is not released at that time by the anther i.e. the pistils ripen before the stamens (protogyny). Self-incompatibility is a genetic condition in which the pollen grains of the flower do not germinate on the stigma of that same flower. This mechanism occurs due to the presence of some self-sterile genes. Final answer Dichogamy is observed in several angiosperms. Protandry is found in fireweed and salvia. Protogyny is observed in barley and wheat. Self-incompatibility is commonly observed in roses. A condition of heterostyly is observed in which the length of the style (neck of the pistil) varies.
