Which outcome occurs under high leaf temperature when rubisco oxygenase activity surpasses carboxylase activity?

💡 Explanation

When temperature increases causing oxygenase activity to become favored over carboxylase activity due to an increased relative affinity for oxygen and photorespiration increases, recycling already fixed CO2, and leading to diminished net photosynthesis. Therefore photorespiration increase results, rather than stomatal closure which decreases CO2 levels, affecting photosynthesis, chlorophyll degradation which impairs energy capture, or starch accumulation which would imply an enhancement of photosynthesis.

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