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Microbiology of Soils

Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate reductase
nitrate oxidase
none of these
nitro oxidoreductase

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

nitrate reductase
none of these
nitrogenase
nitrate oxidase

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Azotobacter
Clostridium
Rhizobium
Beijerinckia

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

equal to
none of these
generally smaller than
generally greater than

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of O2 and Cl2
It is composed almost exclusively of methane and carbon dioxide
Both (a) and (b)
It also contains with traces of H2S, N2, H2and CO

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

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

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