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MICROBIOLOGY OF SOILS

Microbiology of Soils
The energy value of biogas is typically

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

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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Microbiology of Soils
Denitrification is carried out

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

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

Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium
Desulfotomaculum

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

none of these
nitrate reductase
nitrogenase
nitrate oxidase

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