1.5

Question 1

Nitrogen cycle

Answer 1

movement of nitrogen containing molecules between sources of sinks and reservoirs

Question 2

Nitrogen reservoirs…..

Answer 2

hold Nitrogen for relatively short periods of time compared to Carbon cycle

Question 3

The main Nitrogen reservoir is

Answer 3

The atmosphere

Question 4

Nitrogen in the atmosphere is

Answer 4

N2 and not usable by plants or animals

Question 5

Nitrogen is critical for….

Answer 5

plant and animal nutrients. all living things need nitrogen for DNA and amino acids to make protiens

Question 6

Nitrogen fixation

Answer 6

process of N2 gas being converted into biologically available (usable by plants) NH3 ( ammonia) or NO3- ( nitrate)

Question 7

Bacterial fixation

Answer 7

certain bacteria that live in the soil, or in symbiotic relationship with plant root nodules convert N3 into ammonia NH3

Question 8

synthetic fixation

Answer 8

humans combust fossil fuels to convert N2 gas into nitrate

Question 9

assimilation

Answer 9

plants and animals taking nitrogen in and incorporating it into their bodies

Question 10

ammonification

Answer 10

soil bacteria, microbes, and decomposers converting waste and dead biomass back into NH3 and returning it to the soil

Question 11

nitrification

Answer 11

conversion of NH4 into nitrite and then nitrate by soil bacteria

Question 12

denitrification

Answer 12

The conversion of soil Nitrogen into nitrous oxide gas which returns to the atmosphere

Question 13

N2O

Answer 13

Nitrous oxide

Question 14

climate

Answer 14

nitrous oxide is a greenhouse gas which warms the earths climate

Question 15

ammonia volatilization

Answer 15

excess fertilizer use can lead to NH3 gas entering the atmosphere

Question 16

leaching and eutrophication

Answer 16

synthetic fertilizer use leads to nitrates leaching or being carried out of soil by water