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← Nature & AnimalsWhich change occurs when a flooded rice paddy inhibits nitrogenase?
A)Decreased ammonium available for plant uptake✓
B)Increased methane generation in the soil
C)Enhanced potassium absorption by rice roots
D)Reduced denitrification rates within rhizosphere
💡 Explanation
In flooded conditions, anaerobic activity rises; nitrogenase, as a metaloenzyme mediating biological nitrogen fixation, becomes inhibited because it is oxygen-sensitive; therefore, less ammonium is available, rather than other nutrients increasing.
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