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

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

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Microbiology of Soils
Syntrophism involves

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

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