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Microbiology of Soils

Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrogenase
nitrate oxidase
nitrate reductase
none of these

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of bacteria
ingestion of mold
ingestion of fungi
all of these

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

denitrification
nitrogen fixation
ammonification
nitrification

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Microbiology of Soils
Denitrification may be distinguished as

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

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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