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Microbiology of Soils

Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

nitrate
ATP
glucose
ammonia

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitro oxidoreductase
nitrate reductase
none of these
nitrate oxidase

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

medium growth
slow growth
none of these
fast growth

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Microbiology of Soils
Which of the following is not the biofertilisers producing bacteria?

Nostoc
Clostridium
Anabaena
Both (a) and (b)

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

nitrogenase
nitrate oxidase
none of these
nitrate reductase

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Rhizobium
Beijerinckia
Azotobacter

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