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Microbiology of Soils

Microbiology of Soils
Which of the following is not the biofertilisers producing bacteria?

Anabaena
Both (a) and (b)
Clostridium
Nostoc

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

Thiobacillus thiooxidans
Rhodomicrobium
Desulfotomaculum
Rhodospirillum

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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Microbiology of Soils
Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

Aspergillus niger
VA Mycorrhiza
Candida torulopsis
Saccharomyces cerevisiae

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate oxidase
nitro oxidoreductase
none of these
nitrate reductase

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

nitrogen fixation
denitrification
ammonification
nitrification

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