Which outcome limits carbon fixation when temperature increases significantly in C3 plants?

💡 Explanation

When temperature increases sharply photorespiration accelerates as Rubisco’s affinity for oxygen rises faster than its affinity for carbon dioxide, leading to unproductive oxidation of RuBP. Therefore fixation declines because the CO2:O2 ratio declines at rubisco active sites rather than stomatal or chlorophyll issues or atp declines under these circumstances.

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