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

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
Both (a) and (b)

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Microbiology of Soils
Nitrogen fixation

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

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