Contrivances for self-pollination are:

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(D) Self-pollination (autogamy) is facilitated by several mechanisms in plants:$1$. Bisexuality: The presence of both male (stamen) and female (pistil

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All of these

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(D) Self-pollination (autogamy) is facilitated by several mechanisms in plants:$1$. Bisexuality: The presence of both male (stamen) and female (pistil) reproductive organs in the same flower.$2$. Homogamy: The maturation of both anthers and stigma at the same time,which ensures that pollen can fertilize the stigma of the same flower.$3$. Cleistogamy: $A$ condition where flowers remain closed,forcing self-pollination to occur within the closed bud.Since all these mechanisms promote self-pollination,the correct answer is $D$.

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