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Of the total incident solar radiation the proportion of PAR is

  (a) about 70%

  (b) about 60%

 (c) less than 50%

 (d) more than 80%

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Correct option (c) less than 50%


 The source of energy in all ecosystem is solar energy. About 50% of the solar energy incident over earth rs 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). Roughll. 20% of it is consumed in respiration so that net capture of energy (net primary productivity) is 0.8-4% of incident radiation or 1.6-8% of PAR.

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