Which outcome occurs when a C3 plant experiences sustained high temperatures and decreased intercellular CO2 concentration?

💡 Explanation

When temperatures rise and CO2 levels decrease in a C3 plant, Rubisco oxygenase activity increases because its affinity for O2 becomes relatively higher, resulting in a switch to photorespiration to reduce the overall effectiveness of photosynthesis. Therefore, higher photorespiration results rather than efficient carbon fixation, enhanced C4 synthesis, or downregulated chlorophyll, which involve alternate biochemical pathways.

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