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12.Ecosystem
medium
$PAR$ stands for
A
Photosynthesis Active Reaction
B
Photosynthesis Absorb Radiation
C
Photosynthetically Active Radiation
D
Photosynthetically Active Reaction
Solution
$PAR$ – Photosynthetically Active Radiation. The sum is the only source of energy for all ecosystems on earth. Out of the total incident solar radiation, only $50\; \%$ of it is photosynthetically Active Radiation $(PAR)$ Plantscapture only $2-10\; \%$ of the $PAR$ and this small amount of energy sustains the entire living world. So, there is unidirectional flow of energy from the sun to producers and then to consumer
Standard 12
Biology