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List three strategies that a bisexual ch...

List three strategies that a bisexual chasmogamous flower can evolve to prevent self-pollination (autogamy).

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(i) Protandry (maturation of anthers before stigma) or protogyny (maturation of stigma before anther) i.e. Dichogamy may take place.
(ii) To bear styles of different lengths (heterostyly).
(iii) To bear lever mechanism eg. Saliva.
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