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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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?
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1answer
71 views

Does photosynthesis begin instantly when a plant is exposed to light?

I'm curious to know if the process of photosynthesis has a "ramp-up" time to become useful to a plant, or if it begins instantaneously when the plant is exposed to light after a period of darkness. ...
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Can plants photosynthesize all-day?

If a plant was given sunlight even during the night, with appropriate constant intensity during day and night, will the plant be able to maintain health and normally photosynthesize throughout the day?...
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136 views

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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1answer
209 views

Total dark deprivation at day-neutral plants

First of all, I am not a biologist. Almost for a week, a question has come to my mind: "Is it harmful ceaselessly exposing a plant to light?" (I mean with natural & artificial light ...
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0answers
25 views

How to seek information on the duration of biological entrainment processes in mammals? [closed]

This is a question that is a little bit hard to define for me. I'm interested in learning more about times of "attractor/entrainment" processes that may take place in the body/brain of mammals, and ...
4
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1answer
171 views

What light intensity determines the start/end of a photoperiod in humans?

I'm reading this article, which discusses the influence of Long Photoperiod (LP) and Short Photoperiod (SP) on melatonin production: HIOMT drives the photoperiodic changes in the amplitude of the ...