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← Nature & AnimalsWhich outcome occurs when increased soil acidity inhibits nitrogenase?
A)Reduced plant available fixed nitrogen✓
B)Strengthened plant immune mechanisms
C)Enhanced phosphorus uptake efficiency
D)Increased soil carbon sequestration rate
💡 Explanation
Inhibiting nitrogenase, the key enzyme in nitrogen fixation, decreases biological nitrogen fixation in soil because the altered pH causes inactivation; therefore, less plant-available nitrogen results, rather than improved immunity or changes in phosphorus/carbon cycles.
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