(B) $Cleistogamy$ is a phenomenon where flowers do not open at all. In such flowers,the anthers and stigma lie close to each other. When anthers dehis

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(B) $Cleistogamy$ is a phenomenon where flowers do not open at all. In such flowers,the anthers and stigma lie close to each other. When anthers dehisce in the flower buds,pollen grains come in contact with the stigma to effect pollination. Thus,$Cleistogamy$ ensures self-pollination within a single flower.