In some perfect flowers, the receptiveness of the stigma is delayed until after its anthers have released pollen. This delay prevents

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The delayed receptiveness of the stigma after the anthers have released pollen prevents self-fertilization in perfect flowers. This is because the pollen from the same flower cannot fertilize the egg cells on the same flower since the stigma is not receptive yet. This promotes cross-fertilization and genetic diversity.

In Some Perfect Flowers, the Receptiveness of the Stigma Is