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12.Ecosystem
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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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