Bisexual flower remains closed all their life so that pollen can easily pollinate the stigma of the flower .

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Solution

Cleistogamy:
It is a process where the bisexual flowers will be closed throughout their life so that the 'pollen' can easily 'pollinate' the stigma of the flower.
Examples of cleistogamous flowers include Viola, Oxalis, Commelina, and Cardamine.
Final answer: Bisexual flower remains closed all their life so that pollen can easily pollinate the stigma of the flower Cleistogamous.

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