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

340-450 nm

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400-700 nm

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500-600 nm

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450-950 nm

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Solution

The correct option is B 400-700 nm
Photosynthetically 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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