Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

changing of atmospheric nitrogen (N2) to nitrogen compounds
None of these
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
conversion of ammonium ions into nitrates through the activities of certain bacteria.

ANSWER DOWNLOAD EXAMIANS APP

Microbiology of Soils
Nitrogen fixation

fix the free nitrogen (N2) by which it should not be usable by plants
both (a) and (b)
changes the free nitrogen (N2) to a form usable by plants
especially changes nitrogen compounds, mostly amines such as NH2

ANSWER DOWNLOAD EXAMIANS APP