Of the total incident solar radiation the proportion of PAR is

Of the total incident solar radiation the proportion of PAR is
  1. about $60 \%$
  2. less than $50 \%$
  3. more than $80 \%$
  4. about $70 \%$

Solution

PAR (Photosynthetically active radiation) designates the spectral range of solar radiation from 400 to $700 \mathrm{~nm}$ that photosynthetic organisms are able to use in the process of photosynthesis. Of the total incident solar radiation the proportion of PAR is less than $50 \%$.

Asked in: NEET 2011 (Screening)

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