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Microbiology of Soils

Microbiology of Soils
The energy value of biogas is typically

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

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Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

30-40
20-30
60-80
10-20

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Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Rhodospirillum
Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

all of these
nitrification
denitrification
nitrogen fixation

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

nitrogen fixation
all of these
nitrogen oxidation
sulfur oxidation

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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