Which range of wavelenght (in nm) is called photosyntehtically active radiation (PAR)?

Options

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

Answer

C

Explanation

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