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Question

Which of the following is not an outbreeding device used by the plants?

A
Unisexuality
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B
Dichogamy
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C
Heterostyly
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D
Cleistogamy
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Solution

The correct option is D Cleistogamy

Outbreeding devices are devices that discourage self-pollination and encourage cross-pollination. It can be of the following types:

1) Unisexuality: Flowers are unisexual so that they either promote geitonogamy or cross-pollination.

2) Dichogamy: Anthers and stigma mature at different times in bisexual flowers.

3) Self-incompatibility: Pollen grains of the flower do not germinate on the stigma of the same flower or flowers of the same plant.

4) Heterostyly: Anther and stigma are placed at different locations.

Cleistogamous flowers are those that remain closed and facilitate self-pollination. Flowers are intersexual.


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