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Nature & Animals

Which consequence results when a rice paddy experiences sustained anaerobic conditions?

A)Reduced nitrogen fixation by diazotrophs
B)Increased methane oxidation by methanotrophs
C)Enhanced phosphorus uptake by roots
D)Greater iron reduction by microbes

💡 Explanation

Anaerobic conditions inhibit nitrogenase, the enzyme required for nitrogen fixation by diazotrophs, because the enzyme is oxygen-sensitive; therefore, nitrogen availability deceases, rather than phosphorus uptake increasing or methane-oxidizing bacteria flourishing.

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