Which photosynthetic rate change results when C3 plants experience elevated CO2 levels that favor carboxylation by rubisco?

💡 Explanation

When CO2 levels rise favoring carboxylation, rubisco's oxygenation activity decreases because competitive inhibition diminishes, leading to reduced photorespiration and increased CO2 fixation. Therefore, a moderate increase in the net photosynthetic rate results, rather than increased photorespiration or an unchanged rate, which require low CO2 and high O2.

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