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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

all of these
Micromonospora
Nocardia
Streptomyces

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Microbiology of Soils
Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

Aspergillus niger
VA Mycorrhiza
Candida torulopsis
Saccharomyces cerevisiae

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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

nitrification
nitrogen fixation
ammonification
denitrification

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

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

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Microbiology of Soils
Bacteria, as a group, are responsible for

nitrogen oxidation
sulfur oxidation
nitrogen fixation
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
Transitional
All of these
Hydrolytic

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