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
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

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

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