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← Nature & AnimalsWhich consequence results when elevated CO₂ causes decreased stomatal conductance in C4 grasses?
A)Amplified water loss per fixed carbon
B)Diminished photosynthetic capacity at high temperatures✓
C)Enhanced photorespiration preventing efficient carbon fixation
D)Increased root biomass and nutrient uptake
💡 Explanation
Reduced stomatal conductance decreases transpiration; because of CO₂ concentrating mechanisms, C4 plants face elevated leaf temperatures. These leaf temperatures lead, therefore, to diminished photosynthesis, rather than enhanced water use efficiency characteristic of C3.
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