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MICROBIOLOGY OF SOILS

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

Chromaticum
Chlorobium
Both (a) and (b)
Rhodomicrobium

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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

slow growth
none of these
medium growth
fast growth

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Microbiology of Soils
Bacteria, as a group, are responsible for

all of these
nitrogen fixation
sulfur oxidation
nitrogen oxidation

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

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

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally greater than
generally smaller than
none of these
equal to

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