Question

Describe three devices by which cross pollination is encouraged in Angiosperms by avoiding self pollination​

Answer 1

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Three outbreeding devices that flowering plants have developed:

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• Receptivity of stigma and release of the pollen grain is not synchronized, i.e., stigma becomes receptive much before pollens are released or after they are released to avoid self-pollination.

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• Self-incompatibility: A genetic method to prevent pollens from fertilizing ovules of the same flower by inhibiting their germination on stigma or pistil.

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• Production of unisexual flowers: So that the male and female parts will be present on different plants i.e., dioecious or on different flowers in the same plant (monoecious).

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• This prevents both autogamy and geitonogamy.

Answer 2

Explanation:

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