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Question

Photosynthetic Active Radiation (PAR) has the following range of wavelengths
  1. 340-450 nm
  2. 400-700 nm
  3. 500-600 nm
  4. 450-950 nm


Solution

The correct option is B 400-700 nm
Photosynthetic active radiation is the range of solar radiation which is received by plants and absorbed maximally for the process of photosynthesis. It has a range of 400-700 nm.
Rate of photosynthesis is maximum at 647-660 nm while 690-700 is insufficient for photosynthesis.

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