Which flowers never open?

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(D) 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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Cleistogamous flowers of Commelina

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(D) 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 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. Examples include Commelina,Viola,and Oxalis.

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