Which light range is most effective in photosynthesis?


Red light is more effective in photosynthesis because both the photosystems (PS I and PS II) absorb light of wavelengths in the red region (680 and 700 nm, respectively). Furthermore, blue light is absorbed by carotenoids, which pass the energy to the chlorophyll.

  • Light in the red region is absorbed by chlorophyll.
  • Since maximum absorption by chlorophyll  occurs in red light, it is the most effective wavelength for photosynthesis.
  • Green light is least effective in photosynthesis.

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