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Which 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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