Question

What is photoperiod ?
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Answer 1

Step-by-step explanation:

the period of time each day during which an organism receives illumination; day length.

Answer 2

"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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