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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
Denitrification may be distinguished as

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

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

Nitrifying bacteria
Cyanobacteia
De-nitrifying bacteria
Pectin decomposing bacteria

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally greater than
generally smaller than
none of these
equal to

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

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

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

denitrification
nitrification
ammonification
nitrogen fixation

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