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  4. Of the total incident solar radiation the proportion of PAR is

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Q. Of the total incident solar radiation the proportion of $PAR$ is

Himachal Pradesh PMTHimachal Pradesh PMT 2010Ecosystem

Solution:

The source of energy in all ecosystem is solar energy. About 50% of the solar energy incident over earth is present in PAR (Photosynthetically active radiation). About 1 -5% of incident solar radiation or 2 - 10% of PAR is captured by the photosynthetic organisms in the synthesis of organic matter (gross primary productivity). Roughly 20% of it is consumed in respiration so that net capture of energy (net primary productivity) is 0.8 - 4% of incident radiation or