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

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

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Microbiology of Soils
A heterocyst is

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

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