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Microbiology of Soils

Microbiology of Soils
Degree of compost maturity can be assesed by

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

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

all of these
Streptomyces
Micromonospora
Nocardia

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

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

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

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Microbiology of Soils
Denitrification is carried out

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

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

considerably less important in comparison to the symbiotic bacteria
Clostridium
Azotobacter
All of these

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