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Microbiology of Soils

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

Nocardia
Streptomyces
Micromonospora
all of these

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Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium

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

ATP
nitrate
ammonia
glucose

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

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

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate reductase
none of these
nitrate oxidase
nitro oxidoreductase

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Microbiology of Soils
Assimilative denitrification is done by

fungi
plants
prokaryotes
all of these

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