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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Rhizobium
Beijerinckia
Azotobacter

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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
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

All of these
methanogenic
Hydrolytic
Transitional

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Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

30-40
10-20
20-30
60-80

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

all of these
nitrogen oxidation
nitrogen fixation
sulfur oxidation

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Microbiology of Soils
The microbial ecosystem of soil includes

abiotic components of soil
biotic and abiotic components of soil
biotic components of soil
None of these

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