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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
all of these
Micromonospora

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Microbiology of Soils
Assimilative denitrification is done by

plants
all of these
prokaryotes
fungi

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Microbiology of Soils
The energy value of biogas is typically

1,000 BTU/ft3
400-700 BTU/ft3
1500 BTU/ft3
more than 5000 BTU/ft3

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

None of these
one species of a pair benefits
both the species of a pair benefit
one species of a pair is more benefited

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

denitrification
nitrification
ammonification
nitrogen fixation

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Azotobacter
Rhizobium
Clostridium

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