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Microbiology of Soils

Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

nitrogen fixation
ammonification
denitrification
nitrification

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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

Rhodomicrobium
Rhodospirillum
Desulfotomaculum
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?

Alcaligenes
Agrobacterium
Achromobacter
None of these

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Microbiology of Soils
Bacteria, as a group, are responsible for

nitrogen fixation
all of these
sulfur oxidation
nitrogen oxidation

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

Both (a) and (b)
Anabaena
Clostridium
Nostoc

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