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Photosynthetically active radiation (PAR) lies in the wavelength range of

  • (a) 500-600 nm Your answer
  • (b) 340-450 nm Your answer
  • (c) 450-950 nm Your answer
  • (d) 400-700 nm Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Photosynthetically active radiation (PAR) is the light between 400 nm and 700 nm, the part of the spectrum used in photosynthesis.

Why the other options are wrong

  • (a) · your answer 500-600 nm is mostly green-yellow light, only part of PAR.
  • (b) · your answer 340-450 nm includes ultraviolet light, which is outside PAR.
  • (c) · your answer Light above 700 nm (far-red, infrared) is outside PAR.
NCERT point: Plants use only a part of the sunlight falling on them; PAR is 400-700 nm.
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