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(B) In $C_3$ plants,the enzyme $RuBisCO$ can bind to both $CO_2$ and $O_2$. When the concentration of $O_2$ increases in the atmosphere,$RuBisCO$ acts

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Photosynthesis would decrease

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(B) In $C_3$ plants,the enzyme $RuBisCO$ can bind to both $CO_2$ and $O_2$. When the concentration of $O_2$ increases in the atmosphere,$RuBisCO$ acts as an oxygenase rather than a carboxylase. This leads to a process called photorespiration,where $O_2$ is consumed and $CO_2$ is released without the production of $ATP$ or $NADPH$. Consequently,the rate of photosynthesis decreases because the efficiency of carbon fixation is reduced.

When a photosynthetic plant is transferred to an atmosphere of enriched $O_2$,its rate of

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