what is photoperiod for class 9
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Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. It occurs in plants and animals. Photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods.
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Photoperiod is the period of direct exposure to sunlight by a plant. It is response of an organism to change in day length i.e.photoperiod are related to the duration of sunlight. Growth of plant &flowering are dependent on sunlight .
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