Which process limits carbon fixation efficiency primarily during daytime due to photorespiration in C3 plants?

💡 Explanation

When O2 concentration is high relative to CO2 inside plant leaves during daytime specifically, Rubisco catalyzes oxygenation of RuBP instead of carboxylation because its active site isn't fully selective, inhibiting the crucial initial carbon capturing step. Therefore RuBP oxygenation limits carbon fixation, rather than closure, degradation, or specialization which involve different light independent reaction mechanisms.

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