Q.

When pollen grains are not transferred from anthers to stigma in a flower, due to mechanical barrier, it is called

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a

herkogamy

b

heterogamy

c

cleistogamy

d

dichogamy

answer is A.

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Detailed Solution

Herkogamy is the condition in which the pollen grains fail to reach the stigma. In some flowers, a mechanical barrier exists between the compatible pollen and stigma.
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When pollen grains are not transferred from anthers to stigma in a flower, due to mechanical barrier, it is called