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Microbiology of Soils

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

ammonification
nitrification
nitrogen fixation
denitrification

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

Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium
Desulfotomaculum

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair benefits
None of these
one species of a pair is more benefited
both the species of a pair benefit

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

equal to
generally greater than
none of these
generally smaller than

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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

nitrogen fixation
nitrification
denitrification
ammonification

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

symbiotic
both (a) and (b)
none of these
nonsymbiotic

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