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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?

Rhodomicrobium
Both (a) and (b)
Chlorobium
Chromaticum

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

soybean
all of these
bean and lupine
alfalfa and clover

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

Pectin decomposing bacteria
Cyanobacteia
Nitrifying bacteria
De-nitrifying bacteria

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Agrobacterium
Achromobacter
None of these
Alcaligenes

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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 mold
ingestion of bacteria

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Microbiology of Soils
Degree of compost maturity can be assesed by

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

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