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Of the total incident solar radiation the proportion of PAR is
A
More than 80%
B
About 70%
C
About 60%
D
Less than 50%
Detailed Solution
PAR is photosynthetically active radiation, the part of sunlight (400–700 nm) that plants can use for photosynthesis.
NCERT states that of the incident solar radiation less than 50 per cent is PAR.
Plants capture only 2–10 per cent of this PAR, and this small amount of energy sustains the entire living world.
The remaining part of the incident radiation is ultraviolet and infra-red, which is not used in photosynthesis.
Hence the proportion of PAR is less than 50%.
NCERT states that of the incident solar radiation less than 50 per cent is PAR.
Plants capture only 2–10 per cent of this PAR, and this small amount of energy sustains the entire living world.
The remaining part of the incident radiation is ultraviolet and infra-red, which is not used in photosynthesis.
Hence the proportion of PAR is less than 50%.