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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
dinitrogenase
none of these
dinitrogenase reductase

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

Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans
Rhodospirillum

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Microbiology of Soils
Denitrification is carried out

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

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

nitrate oxidase
nitrogenase
none of these
nitrate reductase

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

bean and lupine
all of these
soybean
alfalfa and clover

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