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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?

Chlorobium
Both (a) and (b)
Chromaticum
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

medium growth
fast growth
none of these
slow growth

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

nitrogen oxidation
nitrogen fixation
all of these
sulfur oxidation

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

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

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

equal to
generally smaller than
generally greater than
none of these

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