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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
Chlorobium
Chromaticum
Both (a) and (b)

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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
nitrification
denitrification
nitrogen fixation

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Microbiology of Soils
The nitrogenase consists of

dinitrogenase
both (a) and (b)
dinitrogenase reductase
none of these

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Azotobacter
Rhizobium
Clostridium

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of H2S, N2, H2and CO
Both (a) and (b)
It also contains with traces of O2 and Cl2
It is composed almost exclusively of methane and carbon dioxide

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

alfalfa and clover
all of these
bean and lupine
soybean

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