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

It is composed almost exclusively of methane and carbon dioxide
Both (a) and (b)
It also contains with traces of H2S, N2, H2and CO
It also contains with traces of O2 and Cl2

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Microbiology of Soils
Syntrophism involves

exchange of nutrients among species
exchange of nutrients between two species
no exchange of nutrients among species
no exchange of nutrients between two species

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