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← Nature & AnimalsWhich mechanism mediates the effects of elevated atmospheric carbon dioxide on plant transpiration rates?
A)Stomata closing decreasing water loss✓
B)Increased root pressure elevating xylem flow
C)Cuticle thickening preventing evaporation
D)Decreased leaf surface temperature increasing humidity
💡 Explanation
When atmospheric carbon dioxide concentration rises, stomata closure is induced because this minimizes water loss per unit carbon dioxide uptake through guard cell turgor pressure responses. Therefore stomata closing and decreased transpiration results, rather than stimulating root pressure, cuticle thickening, or changes in leaf temperature, which operate independently.
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