Which outcome minimizes photorespiration effects when rubisco concentration surpasses substrate availability within plant cells?

💡 Explanation

When rubisco concentration exceeds usable carbon dioxide, photorespiration occurs because rubisco binds oxygen instead. Activation of C4 pathways separates carbon fixation spatially, concentrating CO2 around rubisco, thus suppressing oxygen binding. Enhanced pathway adoption results, rather than cyclic flow or stomatal change which involve alternate mechanisms.

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