In nature,cleistogamous flowers are

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(A) Cleistogamous flowers are those that do not open at all. Because the flowers remain closed,the anthers and stigma lie close to each other. When an

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Self-pollinated

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(A) Cleistogamous flowers are those that do not open at all. Because the flowers remain closed,the anthers and stigma lie close to each other. When anthers dehisce in the closed flower,pollen grains come in contact with the stigma to effect pollination. Thus,cleistogamous flowers are invariably autogamous (self-pollinated) as there is no chance of cross-pollination. Examples include $Commelina$,$Viola$ (common pansy),and $Oxalis$.

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