Which outcome diminishes photosynthetic efficiency when sustained high oxygen levels compete with carbon dioxide during the Calvin cycle?

💡 Explanation

When oxygen binds to rubisco in the Calvin cycle, photorespiration occurs because rubisco catalyzes RuBP oxygenation instead of carboxylation, consuming energy and reducing carbon fixation. Therefore increased photorespiration results,rather than enhanced ATP production, decreased conductance or elevated pigment synthesis, which are linked to separate regulatory mechanisms.

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