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(B) Herkogamy is a mechanical or physical barrier that prevents self-pollination in bisexual flowers.In this mechanism,the spatial arrangement of the

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Herkogamy

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(B) Herkogamy is a mechanical or physical barrier that prevents self-pollination in bisexual flowers.In this mechanism,the spatial arrangement of the anthers and the stigma is such that the pollen grains from the anthers cannot easily reach the stigma of the same flower.This physical separation or barrier ensures cross-pollination by preventing self-pollination.Therefore,the correct option is $B$.

When the pollen grains are not transferred from anthers to the stigma in a flower due to a physical barrier or fence,or when some natural barrier exists between the androecium and gynoecium to check self-pollination,it is known as:

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