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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Azotobacter
Rhizobium
Clostridium
Beijerinckia

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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
slow growth
fast growth
none of these

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

Rhodomicrobium
Chromaticum
Chlorobium
Both (a) and (b)

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

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

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Microbiology of Soils
Denitrification may be distinguished as

both (a) and (b)
blue baby syndrome
assimilative
dissimilative

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Nitrifying bacteria
De-nitrifying bacteria
Pectin decomposing bacteria
Cyanobacteia

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