What effect would occur on photosynthesis if | vedclass

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(C) Photorespiration is a process in $C_3$ plants where the enzyme $RuBisCO$ acts as an oxygenase instead of a carboxylase when oxygen levels are high

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Increase in $C_3$ cycle and no change in $C_4$ cycle

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(C) Photorespiration is a process in $C_3$ plants where the enzyme $RuBisCO$ acts as an oxygenase instead of a carboxylase when oxygen levels are high. When the concentration of oxygen in the atmosphere decreases,the rate of photorespiration decreases. Since photorespiration consumes energy and releases $CO_2$ without producing sugars,a reduction in this process allows $RuBisCO$ to function more efficiently as a carboxylase. Consequently,the efficiency of the $C_3$ cycle increases. $C_4$ plants have a mechanism to concentrate $CO_2$ around $RuBisCO$,which minimizes photorespiration regardless of external oxygen levels; therefore,the $C_4$ cycle remains largely unaffected by changes in atmospheric oxygen concentration.

What effect would occur on photosynthesis if the amount of oxygen in the atmosphere decreases?

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