define photoperiod ?
Anonymous:
the period of time each day during which an organism receives illumination; day length.
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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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the period of time each day during which an organisms receives illumination; day length.
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