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← Nature & AnimalsWhich consequence occurs when rubisco's affinity shifts toward oxygen, specifically in hot, arid plant environments?
A)Enhanced sucrose production increases plant growth
B)Photorespiration reduces photosynthetic efficiency significantly✓
C)Accelerated carbon fixation boosts glucose synthesis
D)Nitrogen assimilation increases overall plant biomass
💡 Explanation
Rubisco's active site binds oxygen rather than carbon dioxide during hot conditions, initiating photorespiration; this is because increased temperatures inhibit carbon dioxide selectivity. Therefore, photosynthetic efficiency decreases rather than increases, favoring photorespiration over carbon fixation.
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