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Microbiology of Soils

Microbiology of Soils
Assimilative denitrification is done by

plants
prokaryotes
fungi
all of these

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

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

Chromaticum
Both (a) and (b)
Rhodomicrobium
Chlorobium

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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
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Streptomyces
Micromonospora
Nocardia
all of these

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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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