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Microbiology of Soils

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

Clostridium
Nostoc
Both (a) and (b)
Anabaena

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

all of these
nitrogen fixation
nitrification
denitrification

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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

slow growth
none of these
fast growth
medium growth

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

all of these
alfalfa and clover
soybean
bean and lupine

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

Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium
Desulfotomaculum

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitro oxidoreductase
nitrate reductase
none of these
nitrate oxidase

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