Repeated self pollination leads to inbreeding depression.
Plants have developed methods to prevent self pollination.
Autogamy is prevented by following ways:
1. Pollen release and stigma receptivity not coordinated.
2. Different positioning of the anther and the stigma
3. Production of unisexual flowers
Ways to prevent both autogamy and geitonogamy:
Presence of male and female flowers on different plants, such that each plant is either male or female (dioecy).
This mechanism is present in several species of papaya.
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