Discussion
Which of the following categories of plants get benefitted more due to elevation of \(\mathrm{CO_{2}}\) level ?
Answer: A
C3 plants benefit more from elevated carbon dioxide. Their carbon fixing enzyme, Rubisco, is not saturated at present CO2 levels and also reacts with oxygen in photorespiration, which more carbon dioxide suppresses, so photosynthesis and growth increase. C4 plants already concentrate CO2 around Rubisco in the bundle sheath and CAM plants fix CO2 at night, so their response is small. This is why 'all of the above' is not the answer.
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