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Microbiology of Soils

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

nitrate reductase
nitrogenase
nitrate oxidase
none of these

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

fast growth
none of these
medium growth
slow growth

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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
The population of algae in soil is __________ that of either bacteria or fungi.

generally smaller than
none of these
generally greater than
equal to

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Microbiology of Soils
Which are the main source of biofertilisers?

Streptococcus
Cyanobacteria
None of these
Bacillus

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

Rhodomicrobium
Desulfotomaculum
Rhodospirillum
Thiobacillus thiooxidans

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