The amount of sun energy trapped by plants is:
1 % - 3 %
12 % - 15 %
17 % - 20 %
23 % - 26 %
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UPSC Geoscientist – 2020
Most of the solar energy incident on a plant is not used for photosynthesis; it is reflected, transmitted, or dissipated as heat. Only a small fraction is converted into biomass.