Which inefficiency increases when rubisco catalyzes the fixation of oxygen instead of carbon dioxide?

💡 Explanation

When rubisco fixes oxygen (photorespiration), phosphoglycolate is produced, requiring ATP and releasing CO2 without carbon fixation, thus lowering net photosynthesis. Therefore, photosynthetic output declines, rather than ATP excess, enhanced nitrogen assimilation, or stomatal resistance to photorespiration because photorespiration actively works against carbon fixation.

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