Question 49
Nutrient CyclingAtmospheric nitrogen is directly replenished in nature through
- A.the activities of denitrifying bacteria
- B.the breakdown of ammonium salts in the soil
- C.the activities of nitrifying bacteria
- D.the activities of nitrogen-fixing bacteria in root nodules
- E.egestion, death and decay.
Show the answer and explanation
Answer: A (the activities of denitrifying bacteria)
Explanation
Denitrifying bacteria break down nitrates in the soil and release free nitrogen gas, which goes back into the atmosphere.