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Explain any four outbreeding devices tha...

Explain any four outbreeding devices that prevents autogamy.

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Unisexuality (Dicliny) : The production of unisexual flowers in a plant to avoid self pollination.
Ex: Papaya.
Dichogamy : In bisexual flowers maturation of stamens and pistils at different times.
Heterostyly : Placement of anther and stigma at different positions.
Ex : Prim rose
Self-incompatibiulity : pollen grains fail to germinate on the stigma of the same flower.
Ex : passiflora
Herkogamy : Physical barriers present between anthers and stigma
Ex : Calotropis
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