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Microbiology of Soils

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

Nostoc
Both (a) and (b)
Anabaena
Clostridium

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

soybean
bean and lupine
alfalfa and clover
all of these

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Clostridium
Rhizobium
Azotobacter

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Microbiology of Soils
Denitrification may be distinguished as

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

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

Desulfotomaculum
Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans

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

nitrogenase
none of these
nitrate oxidase
nitrate reductase

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