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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Azotobacter
Clostridium
Rhizobium

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of fungi
all of these
ingestion of mold
ingestion of bacteria

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

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

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

all of these
nitrogen oxidation
nitrogen fixation
sulfur oxidation

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

water
all of these
mold mycelium
minerals

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

Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium

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