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Found Photoperiod 2 times.

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1. Photoperiod
Recurring cycle of light and dark periods. The natural photoperiod is approximately 24 hours, and the ratio of light to dark hours slowly changes over the course of a year. In controlled experiments, the photoperiod is usually (but not necessarily) retained at 24 hours, and the light:dark ratio is typically constant.

2. Photoperiodism
The ability of certain plants to sense the relative amounts of light and dark in a 24-hour period; controls the onset of flowering in many plants.

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