12.Ecosystem
normal

કુલ સૌર વિકિરણમાં કેટલા પ્રમાણમાં $PAR$ પ્રાપ્ત થાય છે?

A

આશરે $70\%$

B

આશરે $60\%$

C

$50\%$ કરતા ઓછું

D

$80\%$ કરતા વધારે

(AIPMT-2011)

Solution

(c) :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 $1.6 -8\%$ of $PAR$.

Standard 12
Biology

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