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Microbiology of Soils

Microbiology of Soils
Which are the main source of biofertilisers?

None of these
Bacillus
Streptococcus
Cyanobacteria

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Alcaligenes
Achromobacter
None of these
Agrobacterium

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

Rhodospirillum
Rhodomicrobium
Desulfotomaculum
Thiobacillus thiooxidans

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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 physical structure of soil is improved by the accumulation of

all of these
water
mold mycelium
minerals

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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
Desulfotomaculum
Rhodospirillum

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