Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Non symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only
Symbiotic microorganisms only
None of these

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Microbiology of Soils
A heterocyst is

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

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