Microbiology of Soils
Nitrogen fixation

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

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Microbiology of Soils
Syntrophism involves

exchange of nutrients among species
no exchange of nutrients among species
no exchange of nutrients between two species
exchange of nutrients between two species

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Microbiology of Soils
Denitrification is

changing of atmospheric nitrogen (N2) to nitrogen compounds
reduction of nitrate (NO3-) to nitrogen gas
reduction of nitrate to organic nitrogen compounds
both (a) and (b)

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