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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Azotobacter
Beijerinckia
Clostridium

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

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

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Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

Hydrolytic
Transitional
All of these
methanogenic

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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

nitrification
denitrification
ammonification
nitrogen fixation

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitrate oxidase
nitro oxidoreductase
nitrate reductase

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Micromonospora
Nocardia
all of these
Streptomyces

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