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Question

Unisexual flowers with androecium cannot produce fruits on the same plant as it lacks the following part

A
Calyx
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B
Corolla
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C
Pollen
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D
Pistil
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Solution

The correct option is B Pistil
When a flower lacks one of its sexual organs it is considered to be a unisexual flower and many plants use it for preventing auto and geitonogamy.
The flower mentioned here is a male flower and is not able to produce fruit because it lacks pistil and fertilization does not take place.
So the correct option is 'pistil'

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