The response of a plant related to the length of the day and night is called:
Correct answer: D. Photo-Periodism
- A. Photo-receptor
- B. Photo-taxis
- C. Photo-tropism
- D. Photo-Periodism
Explanation
Photoperiodism is the ability of plants and animals to measure environmental day length (photoperiod), typically by monitoring night length. This process underlies a biological calendar. Photoperiod is inversely correlated to the nightly duration of melatonin secretion in animals.
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