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Question

Which range of wavelength (in nm) is called photosynthetically active radiation (PAR)?

A
100-390
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B
390-430
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C
400-700
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D
760-10,000
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Solution

The correct option is B 400-700
Sunlight or solar radiations reaching the earth have wavelength between 300 nm (in the ultra volt rang) to 2600 nm (in the infa-red range). Part of the spectrum used in photosynthesis has a wavelength between 400-700 nm, it is called as photo synthetically active radiation (PAR).

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