Which limitation primarily prevents C3 plants possessing functioning rubisco from efficiently fixing carbon above 30°C?

💡 Explanation

At higher temperatures, rubisco catalyzes photorespiration rather than carboxylation because its affinity for O2 increases; O2 outcompetes CO2. The rate of photorespiration increases significantly. Therefore photorespiration dominates, rather than activation, ATP depletion or stomatal malfunction, all dependent from distinct biochemical processes.

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