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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Rhizobium
Azotobacter
Beijerinckia

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Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Rhodomicrobium
Chlorobium
Both (a) and (b)
Chromaticum

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair benefits
both the species of a pair benefit
None of these
one species of a pair is more benefited

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Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
dinitrogenase
none of these
dinitrogenase reductase

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

none of these
fast growth
slow growth
medium growth

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

none of these
symbiotic
nonsymbiotic
both (a) and (b)

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