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  4. A reduction in the quantity of oxygen evolution during photosynthesis may be observed at

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Q. A reduction in the quantity of oxygen evolution during photosynthesis may be observed at

J & K CETJ & K CET 2011Photosynthesis in Higher Plants

Solution:

Plants use radiations of wavelength between $400$ - $700\, nm$ for photosynthesis. It is called as photosynthetically active radiation $(PAR)$. Therefore, below $400\, nm$ photosynthesis does not take place and oxygen will also not release as the oxygen releases by the photolysis of water during photosynthesis