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← Nature & AnimalsWhich metabolic outcome occurs when limited rainfall concentrates solutes in a C4 plant?
A)Carbon fixation shifts to CAM✓
B)Photorespiration rates intensely decline
C)RuBisCO activity increases efficiently
D)Stomatal closure is fully prevented
💡 Explanation
Shifting to CAM photosynthesis occurs because lower water potentials trigger CAM pathways, switching from C4 to conserve water through temporal separation of carbon fixation. Therefore, malate production increases rather than photorespiration dropping, since stomata close at night.
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