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Nature & Animals

Which outcome occurs when high CO2 levels around guard cells?

A)Stomata close to reduce transpiration
B)Increased photosynthesis enhancing sugar output
C)Accelerated nutrient uptake from soil
D)Elevated root respiration anaerobic metabolism

💡 Explanation

Stomata close partially because elevated CO2 triggers abscisic acid production causing ion efflux via osmosis; therefore reduced transpiration occurs, rather than continued water loss, and altered photosynthetic rates occur under different conditions.

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