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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

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

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

all of these
denitrification
nitrogen fixation
nitrification

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

all of these
Nocardia
Streptomyces
Micromonospora

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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

denitrification
ammonification
nitrogen fixation
nitrification

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Microbiology of Soils
Denitrification is carried out

usually by facultative anaerobes
All of these
predominantly by Pseudomonas spp
predominantly by Bacillus spp

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

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