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

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Microbiology of Soils
Nitrogen fixation

especially changes nitrogen compounds, mostly amines such as NH2
changes the free nitrogen (N2) to a form usable by plants
both (a) and (b)
fix the free nitrogen (N2) by which it should not be usable by plants

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