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Microbiology of Soils

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

nitrification
ammonification
nitrogen fixation
denitrification

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Microbiology of Soils
Denitrification is carried out

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

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

Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium
Rhodospirillum

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

denitrification
nitrification
nitrogen fixation
ammonification

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Nitrifying bacteria
Cyanobacteia
Pectin decomposing bacteria
De-nitrifying bacteria

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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