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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Azotobacter
Clostridium
Rhizobium
Beijerinckia

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

Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium
Desulfotomaculum

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

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

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Microbiology of Soils
Denitrification is carried out

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

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

Rhodomicrobium
Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

mold mycelium
all of these
minerals
water

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