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← Nature & AnimalsWhich outcome sharply reduces resource use inside water-stressed CAM plants?
A)Daytime stomatal closing duration decreases
B)Malate decarboxylation only during daylight✓
C)PEP carboxylase always captures external carbon
D)Rubisco activity is localized to mesophyll
💡 Explanation
Malate decarboxylation produces CO₂ locally only during light-dependent reactions because this recycling minimizes wasteful photorespiration. Therefore, water use and CO₂ need decreases, rather than altering diffusion through open stomata.
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