Question

Bacteria from the soil absorb nitrogen from the air and convert it into ammonium. This is an example of _____.

the hydrologic cycle
nitrogen fixation
assimilation
carbon cycle

Answer 1

Bacteria from the soil absorb nitrogen from the air and convert it into ammonium. This is an example of nitrogen fixation .

Answer 2

Nitrogen fixation

This process creates organic compounds, including ammonium, that contribute to the growth of a plant in much the way fertilizer does. Many plants have evolved to facilitate nitrogen fixing bacteria in their roots as to promote production of these organic compounds when the soil quality is poor or lacking in these bacteria.