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Microbiology of Soils

Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

10-20
30-40
20-30
60-80

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Microbiology of Soils
The energy value of biogas is typically

1,000 BTU/ft3
1500 BTU/ft3
more than 5000 BTU/ft3
400-700 BTU/ft3

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

nitrogen fixation
all of these
nitrification
denitrification

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Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

nitrate
ATP
glucose
ammonia

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Microbiology of Soils
The microbial ecosystem of soil includes

biotic components of soil
biotic and abiotic components of soil
None of these
abiotic components of soil

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

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

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