B2c - Nitrogen Cycle Flashcards
0
Q
Why can’t animals use nitrogen directly?
A
It is too unreactive.
1
Q
What percentage of the atmosphere is nitrogen?
A
About 78%.
2
Q
What is denitrifying bacteria?
A
Bacteria that turn nitrates in the soil back to nitrogen gas.
3
Q
What are nitrogen fixing bacteria?
A
They turn nitrogen gas into nitrates in soil/plants/animals.
4
Q
What are nitrifying bacteria?
A
They turn ammonium in the soil into nitrites and nitrates.
5
Q
What is putrefaction?
A
When nitrogen is put into the soil through animal waste or organic remains.
6
Q
What do we use nitrogen for?
A
To make proteins.
