Which outcome reduces photorespiration when a C4 plant's bundle sheath encounters high oxygen levels?

💡 Explanation

When oxygen levels are high in bundle sheath cells of C4 plants, the spatial separation of carbon fixation via the C4 pathway isolates RuBisCO in the bundle sheath, accumulating CO₂ there and minimizing photorespiration. Therefore spatial separation increases photosynthetic efficiency, rather than oxygenase activity, stomatal closure, or nitrogen assimilation, which have different impacts.

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