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← Nature & AnimalsWhich gas exchange outcome predominates when arid-adapted plants close their stomata during daylight hours?
A)Internal oxygen concentration increases
B)Photorespiration rate becomes elevated✓
C)Carbon dioxide uptake rate increases
D)Transpiration rate significantly increases
💡 Explanation
When stomata close during daylight in arid environments, carbon dioxide entry decreases, creating a low-CO2/high-O2 environment in the leaf because photosynthesis continues. Therefore, photorespiration increases, rather than increased oxygen, carbon dioxide, or transpiration which require open stomata for efficient exchange.
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