Question

How does the percentage of nitrogen in the atmosphere remains more or less constant.

• A. After plants and animals die, bacteria and fungi present in the soil convert the nitrogenous wastes into nitrogenous compounds
• B. Certain bacteria and blue green algae present in the soil fix nitrogen from the atmosphere and convert it into compounds of nitrogen.
• C. Once nitrogen is converted into usable compounds, it can be utilised by plants from the soil through their root system
• D. All of the above.

Answer 1

The correct option is D All of the above.

Through different stages of nitrogen cycle, percentage of nitrogen in the atmosphere remains more or less constant.

All the steps in options A, B and C occurs in nitrogen cycle.

Thus, option D, All of the above is correct.