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Microbiology of Soils

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

soybean
all of these
alfalfa and clover
bean and lupine

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Microbiology of Soils
Denitrification may be distinguished as

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

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Microbiology of Soils
The energy value of biogas is typically

1500 BTU/ft3
400-700 BTU/ft3
1,000 BTU/ft3
more than 5000 BTU/ft3

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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
Desulfotomaculum
Rhodomicrobium

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

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

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

nitrogen oxidation
all of these
nitrogen fixation
sulfur oxidation

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