Chapter 3: Nitrogen Cycle

Question 1

1. Converts N2 from atmosphere
   Biotic: N2&raquo_space; NH4+ (ammonium)
   Abiotic: N2&raquo_space; NO3- (nitrate)

Answer 1

1. Nitrogen Fixation

Question 2

2. Nitrifying bacteria convert NH4+ (ammonium) into NO2- (nitrite) and then into NO3- (nitrate)

Answer 2

2. Nitrification

Question 3

3. Producers take up either NH4+ (ammonium) or NO3- (nitrate).
   Consumers assimilate by eating producers

Assimilation = incorporating nitrogen into tissues

Answer 3

3. Assimilation

Question 4

4. Decomposers break down dead animals (biological nitrogen) into NH4+ (ammonium)

Answer 4

4. Mineralization

Question 5

5. In a series of steps performed by bacteria, NO3- (nitrate) is converted into N2O (nitrous oxide), which is converted into N2 (nitrogen gas).

Answer 5

5. Denitrification

Question 6

The transportation of dissolved molecules through the soil via groundwater

Answer 6

Leaching

Question 7

Human activities

Answer 7

Fertilizer use/overuse

Question 8

Order of nitrogen cycle

Answer 8

Nitrogen fixation
Nitrification
Assimilation
Mineralization
Dentrification