Which metabolic shift arises when a plant’s rubisco enzyme experiences elevated temperatures approaching denaturation?

💡 Explanation

When rubisco nears denaturation from heat stress, its specificity diminishes causing photorespiration activation because rubisco binds oxygen instead of carbon dioxide, greatly disrupting photosynthesis. Therefore increased photorespiration results, rather than suppressed respiration, accelerated nitrogen fixation, or CAM pathway activation, which all require distinctly different triggering mechanisms.

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