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
Both (a) and (b)
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

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

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