The term anthesis is used for

Cluster of anthers

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Opening of flowers

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Dehiscence of anthers

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Falling of flowers

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Solution

The correct option is B Opening of flowers
The period in which the flower remains open and functional is known as anthesis. Generally, it refers to the opening of a flower. It involves elongation of style beyond upper perianth. Anthesis can be sequential in inflorescence.
In some flowers, this period can be very spectacular, e.g., Banksia.
Thus, the correct answer is option B.

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