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List any two strategy adopted by bisexua...

List any two strategy adopted by bisexual flowers to prevent self-pollination.

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Dichogamy: In bisexual flowers anthers and stigmas mature at different times, thus checking self-pollination. It is of two types.
(1) Protandry:
The stamens mature earlier than the stigmas of the flowers.
Examples: Helianthus and Clerodendrum.
Protogyny:
The stigmas mature earlier than the stamens of the flower.
Examples: Scrophularia nodosa and Aristolochia bracteata.
Self sterility/ Self-incompatibility :
In some plants, when the pollen granin of a flower reaches the stigma of the same, it is unable to germinate or prevented to germinate on its own stigma.
Examples: Abutilon, Passiflora. It is a genetic mechanism.
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Assertion : In some bisexual flowers, anthers and stigma mature at different times. Reason : This is a special adaptation in plants to prevent cross fertilization.