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Nature & Animals

Which 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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