Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

Azotobacter
considerably less important in comparison to the symbiotic bacteria
Clostridium
All of these

ANSWER DOWNLOAD EXAMIANS APP

Microbiology of Soils
Nitrogen fixation

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

ANSWER DOWNLOAD EXAMIANS APP

Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

ANSWER DOWNLOAD EXAMIANS APP