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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
all of these
Micromonospora
Streptomyces

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Microbiology of Soils
The microbial ecosystem of soil includes

biotic components of soil
abiotic components of soil
biotic and abiotic components of soil
None of these

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

nitrate oxidase
nitrate reductase
nitrogenase
none of these

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

all of these
bean and lupine
alfalfa and clover
soybean

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

nitrogen fixation
ammonification
nitrification
denitrification

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

Nitrifying bacteria
Pectin decomposing bacteria
De-nitrifying bacteria
Cyanobacteia

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