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(C) The primary source of energy in all ecosystems is solar energy.Approximately $50\%$ of the total solar radiation incident on the Earth's surface f

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less than $50\%$

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(C) The primary source of energy in all ecosystems is solar energy.Approximately $50\%$ of the total solar radiation incident on the Earth's surface falls within the $PAR$ (Photosynthetically Active Radiation) spectrum.Therefore,the proportion of $PAR$ is less than $50\%$ of the total incident solar radiation.Only about $1-5\%$ of the total incident solar radiation is captured by photosynthetic organisms to synthesize organic matter (Gross Primary Productivity).

Of the total incident solar radiation,the proportion of $PAR$ is:

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