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(D) Photoperiodism is the physiological response of organisms to the length of day or night.$1$. In plants,it regulates the transition from vegetative

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All the above

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(D) Photoperiodism is the physiological response of organisms to the length of day or night.$1$. In plants,it regulates the transition from vegetative growth to flowering.$2$. In animals,particularly birds,it acts as a cue for seasonal activities like moulting,migration,and reproductive cycles.$3$. In many insects,photoperiod influences breeding behavior and diapause.Therefore,all the given options are correct.

Photoperiod is an important factor which affects

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