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Microbiology of Soils

Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

nitrogen fixation
denitrification
ammonification
nitrification

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Nitrifying bacteria
Cyanobacteia
Pectin decomposing bacteria
De-nitrifying bacteria

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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
Streptomyces
Nocardia
all of these

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

methanogenic
All of these
Hydrolytic
Transitional

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

mold mycelium
all of these
minerals
water

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Microbiology of Soils
Denitrification is carried out

All of these
predominantly by Bacillus spp
predominantly by Pseudomonas spp
usually by facultative anaerobes

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