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

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

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Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
Denitrification is

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

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