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Microbiology of Soils

Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrate oxidase
nitrogenase
nitrate reductase
none of these

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Microbiology of Soils
Denitrification is carried out

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

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Microbiology of Soils
Degree of compost maturity can be assesed by

infrared technique
None of these
germination test
both (a) and (b)

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

Desulfotomaculum
Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans

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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?

Agrobacterium
Alcaligenes
None of these
Achromobacter

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Microbiology of Soils
Denitrification may be distinguished as

assimilative
both (a) and (b)
dissimilative
blue baby syndrome

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