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← Nature & AnimalsWhich outcome is triggered when a plant's rubisco enzyme oxygenation affinity increases due to heat stress?
A)Photorespiration rate elevates significantly✓
B)Carbon fixation becomes more efficient
C)Stomata close impeding transpiration
D)Chloroplast ATP production increases rapidly
💡 Explanation
When rubisco's oxygenation affinity intensifies under heat stress, photorespiration enhances because rubisco binds more readily to oxygen instead of carbon dioxide, undermining carbon fixation efficiency. Therefore, photorespiration escalates significantly, opposed to boosting carbon fixation, closing stomata directly, or producing ATP by itself.
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