Biogeochemical Cycles - Nitrogen Cycle

Question 1

the importance of nitrogen

Answer 1

• included in both proteins and nucleic acids

- often the limiting nutrients in plants

Question 2

nitrogen fixation

Answer 2

• important process carried out by some bacteria
• converts N_2 (free nitrogen) to NH_4 (ammonium)
• bacteria grow on roots of legumes

Question 3

nitrogen (free and ammonium)

Answer 3

• in atmosphere and soil

- 80% of atmosphere is nitrogen