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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