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Microbiology of Soils

Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

nitrification
nitrogen fixation
ammonification
denitrification

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Azotobacter
Rhizobium
Beijerinckia

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

Both (a) and (b)
Chlorobium
Rhodomicrobium
Chromaticum

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

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

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

nitrification
denitrification
nitrogen fixation
all of these

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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