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← Nature & AnimalsWhich risk potentially increases under high leaf temperatures when rubisco preferentially binds oxygen?
A)Increased photorespiration pathway activity✓
B)Enhanced RuBP substrate regeneration
C)Decreased ATP production in chloroplasts
D)Suppressed non-photochemical quenching (NPQ)
💡 Explanation
Increased leaf temperature causes increased rubisco oxygenase activity, leading to increased photorespiration rather than carbon fixation because photorespiration consumes energy and releases CO2. Therefore photorespiration goes up rather than ATP production which uses the Calvin cycle.
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