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Microbiology of Soils

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

nitrate oxidase
nitrogenase
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 mold
all of these
ingestion of fungi
ingestion of bacteria

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Microbiology of Soils
Degree of compost maturity can be assesed by

germination test
both (a) and (b)
None of these
infrared technique

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

considerably less important in comparison to the symbiotic bacteria
All of these
Clostridium
Azotobacter

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Rhizobium
Clostridium
Azotobacter

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Non symbiotic and symbiotic microorganisms only
None of these
Non symbiotic microorganisms only
Symbiotic microorganisms only

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