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← Nature & AnimalsWhich inefficiency increases when rubisco catalyzes the fixation of oxygen instead of carbon dioxide?
A)Net photosynthetic output declines significantly✓
B)Chloroplast ATP production exceeds requirements
C)Nitrogen assimilation rates are enhanced
D)Stomatal closure prevents photorespiration
💡 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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