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

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

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Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

conversion of ammonium ions into nitrates through the activities of certain bacteria.
changing of atmospheric nitrogen (N2) to nitrogen compounds
None of these
sulfur is oxidized to the sulfate form through Thiobacillus bacteria

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Microbiology of Soils
Denitrification is

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

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