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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

assimilative
dissimilative
blue baby syndrome
both (a) and (b)

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

nitrate
ATP
ammonia
glucose

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

Rhodomicrobium
Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum

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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

none of these
medium growth
slow growth
fast growth

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

Streptomyces
Micromonospora
Nocardia
all of these

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

nonsymbiotic
symbiotic
none of these
both (a) and (b)

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