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 H2S, N2, H2and CO
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
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

demonstrating growth in a nitrogen free medium
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
measuring15N2 by mass spectrometer
All of these

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Microbiology of Soils
Denitrification is

reduction of nitrate to organic nitrogen compounds
reduction of nitrate (NO3-) to nitrogen gas
changing of atmospheric nitrogen (N2) to nitrogen compounds
both (a) and (b)

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