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MDCAT
Biology
2022

Biology · Bioenergetics

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

Maximum photosynthesis can occur when:

Options
  • A

    Blue light is given to the plant

  • B

    Red light is given to the plant

  • C

    Green light is given to the plant

  • D

    Yellow light is given to the plant

Explanation

Red light is more effective in photosynthesis because both the photosystems absorb light of wavelengths between 680 and 700 nm, respectively. So, option B is correct.

Blue light is absorbed by carotenoids which pass the energy to chlorophyll. Although it's also the light which contributes to photosynthesis.

Red light is more effective in photosynthesis because both the photosystems absorb light of wavelengths between 680 and 700 nm, respectively.

Chlorophyll gives plants their green colour because green wavelength of visible light is reflected by chlorophyll.

Chlorophyll also reflects the yellow spectrum.

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Tagged under Biology · Bioenergetics · 2022