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Question
Cleistogamous flowers are
Options:
A .  Self pollinated
B .  Insect pollinated 
C .  Wind pollinated
D .  Bird pollinated
Answer: Option A
:
A
When some physical barrier is present between male and female reproductive parts of a flower which prevents self-pollination, it is called herkogamy. Some flowers, do not expose their sex organs. Such flowers are called cleistogamous and the phenomenon as cleistogamy. Here self-pollination takes place. Dichogamy refers to maturation of male and female sex organs at different times.

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