Nitrogen Cycle

Question 1

Where is nitrogen being cycled?

Answer 1

Nitrogen is being cycled in all spheres but is not significant in hydrosphere

Question 2

What form does the element nitrogen take?

Answer 2

Nitrogen gas is unuseable must be fixed into nitrates/nitrites/ammonium

Question 3

What are the main processes for cycling nitrogen

Answer 3

Ammonification, nitrification, atmospheric Lightning fixation, dentrification

Question 4

What is the human impact on the nitrogen cycle?

Answer 4

EMissions of cars causes pollution, are green house gases, form photochemical smog, contribute to acid rain and Leads to eutrophication

Question 5

What is atmospheric nitrogen fixation

Answer 5

Is electrical storms lightning provides sufficient energy to split the nitrogen atoms of nitrogen gas forming oxides of nitrogen Nox and No2

Question 6

What are the 3 nitrogen fixers with explanations

Answer 6

Cyanobacteria - are nitrogen fixers that also fix carbon (these are photosynthetic)

Rhizobium - bacteria are mutualistic with certain plants example legumes. They grow in root nodules

Atotobacter - are bacteria associated with the rooting zone (the rhizosphere) of plants in grasslands