In Cleistogamous flowers . . . . . . .

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(B) Cleistogamous flowers are those that do not open at all. In such flowers,the anthers and stigma lie close to each other. When anthers dehisce in t

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Anthers and stigma are closed

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(B) Cleistogamous flowers are those that do not open at all. In such flowers,the anthers and stigma lie close to each other. When anthers dehisce in the closed flower buds,pollen grains come in contact with the stigma to effect pollination. Thus,cleistogamous flowers are invariably autogamous as there is no chance of cross-pollination. Therefore,the correct option is $B$.

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