nitrogen cycle Flashcards
1
Q
Nitrogen Fixation
A
The process by which nitrogen gas is changed into a more reactive form (this can occur in several ways)
2
Q
Lightning
A
Causes some of the nitrogen gas in the air to combine with oxygen, forming nitrogen oxides.
3
Q
Artificial Fertilizers
A
Nitrogen and hydrogen can be made to react in industrial chemical processes which
form ammonia.
4
Q
Nitrogen-Fixing Bacteria
A
They utilize the nitrogen gas from the air spaces in the soil, combining them with
other substances to make ammonium ions and other compounds.
(Such bacteria live in the soil or in the root nodules small swellings on leguminous
plants.)
5
Q
Nitrifying Bacteria
A
Convert the ammonium ions into nitrates
6
Q
Denitrifying Bacteria
A
Undo the work that was done by the nitrifying bacteria
