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← Nature & AnimalsWhich photosynthetic inefficiency arises when stomatal closure limits?
A)Photorespiration decreases carbon fixation efficiency✓
B)Increased ATP synthase reduces carbon gain
C)Oxidative phosphorylation limits NADPH supply
D)Carotenoid production lowers light capture
💡 Explanation
Photorespiration increases because reduced carbon dioxide concentration prevents efficient carboxylation by rubisco, therefore promoting reaction with oxygen rather than carbon dioxide. This wastes energy rather than fixing carbon into sugars.
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