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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?

Chlorobium
Rhodomicrobium
Both (a) and (b)
Chromaticum

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Desulfotomaculum
Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Azotobacter
Clostridium
Rhizobium

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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
The conversion of molecular nitrogen into ammonia is known as

nitrogen fixation
denitrification
ammonification
nitrification

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Microbiology of Soils
Assimilative denitrification is done by

plants
prokaryotes
all of these
fungi

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