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(C) $PAR$ stands for Photosynthetically Active Radiation.The sun is the primary source of energy for all ecosystems on Earth.Out of the total incident

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Photosynthetically Active Radiation

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(C) $PAR$ stands for Photosynthetically Active Radiation.The sun is the primary source of energy for all ecosystems on Earth.Out of the total incident solar radiation,only $50\; \%$ is Photosynthetically Active Radiation $(PAR)$.Plants capture only $2-10\; \%$ of the $PAR$,and this small amount of energy sustains the entire living world.Therefore,there is a unidirectional flow of energy from the sun to producers and then to consumers.

$PAR$ stands for

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