Microbiology of Soils
Denitrification is carried out

usually by facultative anaerobes
predominantly by Bacillus spp
All of these
predominantly by Pseudomonas spp

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Microbiology of Soils
The groups of symbiotic bacteria, which have the ability to fix nitrogen

grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
All of these
these bacteria are from the genus, Rhizobium
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen

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Microbiology of Soils
A heterocyst is

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

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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.
None of these
changing of atmospheric nitrogen (N2) to nitrogen compounds
sulfur is oxidized to the sulfate form through Thiobacillus bacteria

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