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Question

A dioecious flowering plant prevents both

A
Cleistogamy and xenogamy
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B
Autogamy and xenogamy
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C
Autogamy and geitonogamy
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D
Geitonogamy and xenogamy
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Solution

The correct option is C Autogamy and geitonogamy
Autogamy is pollination by transfer of pollen grains from the anther of a flower to the stigma of the same flower.
Geitonogamy is pollination by transfer of pollen grains from the anther of a flower to the stigma of another flower of the same plant.
A plant having unisexual flowers is said to be dioecious. Such a flower will neither exhibit autogamy nor geitonogamy.
Thus the correct answer is option C.

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