Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
Nitrogen fixation

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

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Microbiology of Soils
A heterocyst is

the progenitor of cyanobacterial vegetative cells
a type of spore
a cell that carries out oxygenic photosynthesis
a terminally differentiated cell that fixes nitrogen

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