Select the correct sequence of anaerobic digestion during biogas production.

Biogas produced in $STPs$ is a mixture of which gases?

Study the following flow chart of biogas production and select the correct option for $A, B$ and $C$.
Stage $III$: $C$
Stage $II$: Organic acids $\xrightarrow{B}$ $C$
Stage $I$: Soluble compounds or monomers $\xrightarrow{A}$ Organic acids
(Note: The flow chart shows: Proteins,Fats,Cellulose,Hemicellulose $\rightarrow$ Soluble compounds or monomers $\xrightarrow{A}$ Organic acids $\xrightarrow{B}$ $C$)

The microorganism used in the production of biogas is:

Draw a diagrammatic sketch of a biogas plant and label its various components: Gas Holder,Sludge Chamber,Digester,and Dung + water chamber.

Which is produced during anaerobic fermentation of agricultural wastes?