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  4. Which range of wavelength (in nm) is called photo- synthetically active radiation (PAR)?

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Q. Which range of wavelength (in nm) is called photo- synthetically active radiation (PAR)?

Photosynthesis in Higher Plants

Solution:

Sunlight or solar radiations reaching the earth have wavelength between 300 nm (in the ultraviolet range) to 2600 nm (in the infra-red range). Part of the spectrum used in photosynthesis has a wavelength between 400-700 nm, it is called as photosynthetically active radiation (PAR).