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Microbiology of Soils

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

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

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Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Chromaticum
Rhodomicrobium
Chlorobium
Both (a) and (b)

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of O2 and Cl2
It also contains with traces of H2S, N2, H2and CO
Both (a) and (b)
It is composed almost exclusively of methane and carbon dioxide

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

Rhodomicrobium
Desulfotomaculum
Thiobacillus thiooxidans
Rhodospirillum

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