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Microbiology of Soils

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

nitrogenase
nitrate reductase
nitrate oxidase
none of these

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Microbiology of Soils
Degree of compost maturity can be assesed by

infrared technique
None of these
both (a) and (b)
germination test

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

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

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

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

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Microbiology of Soils
Denitrification is carried out

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

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

Rhodomicrobium
Thiobacillus thiooxidans
Rhodospirillum
Desulfotomaculum

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