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Microbiology of Soils

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

alfalfa and clover
all of these
bean and lupine
soybean

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Thiobacillus thiooxidans
Rhodomicrobium
Rhodospirillum
Desulfotomaculum

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

sulfur oxidation
nitrogen fixation
nitrogen oxidation
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 energy value of biogas is typically

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

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

none of these
symbiotic
both (a) and (b)
nonsymbiotic

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