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Explain three outbreeding devices.

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The outbreeding devices in flowering plants that encourage cross-pollination are: 

1) Dicliny: Flowers are unisexual so that self-pollination is not possible. 

2) Prepotency: Pollen grains of another flower germinate more rapidly over the stigma than the pollen grains of the same flower, e.g., Apple, Grape.

3) Self sterility

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