Photosynthetically active radiation (PAR) represents the following range of wave length
A
450–950 nm
B
340–450 nm
C
400–700 nm
D
500–600 nm
The answer is C.
Solution
Photosynthetically active radiation (PAR) is the part of the solar spectrum that plants can use for photosynthesis. It corresponds to visible light, with wavelengths from about 400 nm (violet-blue) to 700 nm (red). Chlorophyll a and b absorb mainly in the blue (around 430–450 nm) and red (around 640–680 nm) regions of this range. PAR makes up less than half of the total incident solar radiation. So PAR represents the wavelength range 400–700 nm.
ConceptWavelength range of PAR
Photosynthesis in Higher Plants in past papers
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