Examples of photoperiod in the following topics:
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- The rate of melatonin production is affected by the photoperiod.
- During the day photoperiod, little melatonin is produced; however, melatonin production increases during the dark photoperiod (night).
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- Plants use light to track time, which is known as photoperiodism.
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- Photoperiodism is a biological response to the timing and duration of dark and light periods.
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- In order to flower at an appropriate time, a plant can interpret important endogenous and environmental cues such as changes in levels of plant hormones and seasonable temperature and photoperiod changes.