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Nature & Animals

Which risk increases under high temperature when stomatal closure reduces transpiration rate?

A)Photorespiration due to limited CO2
B)Root hypoxia from reduced oxygen transport
C)Nitrogen deficiency due to decreased uptake
D)Xylem collapse from increased water viscosity

💡 Explanation

When stomatal closure limits transpiration under heat stress, CO2 entry decreases while O2 from photosynthesis accumulates in the leaf, favoring photorespiration by rubisco. Therefore, photorespiration increases, rather than root hypoxia, nitrogen deficiency, or xylem collapse, each requiring different limiting factors in the plant.

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