Which outcome follows a sudden temperature increase above optimum for a C3 plant?

💡 Explanation

When temperature increases in C3 plants, Rubisco's oxygenase activity increases disproportionately, leading to increased photorespiration which lowers photosynthetic efficiency and thus limits plant growth. Therefore increased photorespiration results, rather than enhanced carbon fixation, decreased water loss, or greater nitrogen uptake, which are driven by different mechanisms.

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