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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
The diagnostic enzyme for nitrogen-fixing organisms is

nitrate oxidase
nitrate reductase
nitrogenase
none of these

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

nitrification
nitrogen fixation
denitrification
ammonification

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

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

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Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
dinitrogenase reductase
dinitrogenase
none of these

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

denitrification
nitrification
nitrogen fixation
ammonification

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