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Microbiology of Soils

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

none of these
nitrogenase
nitrate oxidase
nitrate reductase

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

generally smaller than
none of these
generally greater than
equal to

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Microbiology of Soils
Degree of compost maturity can be assesed by

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

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

both the species of a pair benefit
one species of a pair is more benefited
one species of a pair benefits
None of these

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

all of these
Streptomyces
Nocardia
Micromonospora

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

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

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