Questions tagged [photoperiod]

the interval in a 24-hour period during which a plant or animal is exposed to light. Use this tag in questions regarding the responses of plants (or animals) to photoperiods i.e. photoperiodism and the study of such responses.

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Effect of interruption of photoperiod in a short day plant

When a short day plant is exposed to its critical period of darkness it flowers. But when it is exposed to a small period of red light which exceeds the critical period it doesn't flower. But when it ...
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What external signals do tell catadromous fish to go from the sea to the rivers?

What signals do tell catadromous fish to go from the sea to the rivers? Is it photoperiodicity? Are there any other signals?