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Microbiology of Soils

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

Both (a) and (b)
Rhodomicrobium
Chlorobium
Chromaticum

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Microbiology of Soils
Degree of compost maturity can be assesed by

germination test
None of these
infrared technique
both (a) and (b)

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

all of these
minerals
water
mold mycelium

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

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

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Azotobacter
Rhizobium
Beijerinckia

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

sulfur oxidation
all of these
nitrogen fixation
nitrogen oxidation

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