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Microbiology of Soils

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

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

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

alfalfa and clover
bean and lupine
all of these
soybean

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

Nitrifying bacteria
De-nitrifying bacteria
Cyanobacteia
Pectin decomposing 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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Microbiology of Soils
Bacteria, as a group, are responsible for

all of these
nitrogen oxidation
sulfur oxidation
nitrogen fixation

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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

nitrification
denitrification
nitrogen fixation
ammonification

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