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← Nature & AnimalsWhich risk increases when a plant's rate of photorespiration spikes during midday heat?
A)Rubisco binds more oxygen✓
B)Stomata allow excessive CO2
C)Chlorophyll production rate peaks
D)Transpiration rates rapidly slow
💡 Explanation
When heat increases photorespiration, the oxygenation reaction by Rubisco is strongly favored because it becomes less specific to CO2. Therefore carbon fixation decreases, rather than high CO2 entry through open stomata mitigating it.
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