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Microbiology of Soils

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

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

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

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

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

slow growth
fast growth
none of these
medium growth

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Microbiology of Soils
Degree of compost maturity can be assesed by

None of these
germination test
infrared technique
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

denitrification
nitrification
nitrogen fixation
ammonification

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

Rhodospirillum
Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans

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