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Microbiology of Soils

Microbiology of Soils
Which are the main source of biofertilisers?

Streptococcus
None of these
Bacillus
Cyanobacteria

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

fast growth
medium growth
none of these
slow growth

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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
Both (a) and (b)
It also contains with traces of H2S, N2, H2and CO

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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
Azotobacter
All of these
Clostridium

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

Desulfotomaculum
Rhodomicrobium
Rhodospirillum
Thiobacillus thiooxidans

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Microbiology of Soils
Denitrification is carried out

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

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