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MICROBIOLOGY OF SOILS

Microbiology of Soils
The energy value of biogas is typically

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

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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Microbiology of Soils
Denitrification is carried out

predominantly by Bacillus spp
predominantly by Pseudomonas spp
All of these
usually by facultative anaerobes

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

Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans
Desulfotomaculum

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

nitrate oxidase
nitrogenase
none of these
nitrate reductase

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