Question

Photosynthetic Active Radiation (PAR) has the following range of wavelengths

• A. 340-450 nm
• B. 400-700 nm
• C. 500-600 nm
• D. 450-950 nm

Answer 1

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.