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← Nature & AnimalsWhich mechanism limits photosynthetic efficiency when CAM plants transition from night acid accumulation to daytime?
A)RuBisCO proximity to oxygen✓
B)Stomatal closure inhibiting CO2 diffusion
C)Inorganic phosphate availability decline
D)Reduced photosystem II quantum yield
💡 Explanation
When CAM plants switch to daytime photosynthesis, accumulated malic acid is decarboxylated, increasing CO2 concentration locally, but oxygen concentration is also high because of photosystem II activity; photorespiration increases because RuBiSCO binds to O2 rather than CO2. Therefore RuBisCO proximity results, rather than other constraints which are not limiting in the special CAM pathway adaptation.
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