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Microbiology of Soils

Microbiology of Soils
Which are the main source of biofertilisers?

Cyanobacteria
None of these
Streptococcus
Bacillus

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Microbiology of Soils
The microbial ecosystem of soil includes

biotic and abiotic components of soil
biotic components of soil
None of these
abiotic components of soil

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

Desulfotomaculum
Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

both the species of a pair benefit
one species of a pair benefits
None of these
one species of a pair is more benefited

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

Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium
Rhodospirillum

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Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

nitrate
ammonia
ATP
glucose

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