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Microbiology of Soils

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

alfalfa and clover
soybean
bean and lupine
all of these

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

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

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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

ammonification
denitrification
nitrogen fixation
nitrification

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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)
nonsymbiotic
symbiotic
none of these

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Micromonospora
Nocardia
Streptomyces
all of these

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Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Both (a) and (b)
Chlorobium
Chromaticum
Rhodomicrobium

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