Methanogens are responsible for -

The highest amount of gas present in biogas is $.......$.

Which one of the following reactions occurs during the process of solubilization in biogas production?

The first step in biogas production is carried out with the help of:

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 $\xrightarrow{B}$ $C$)

What is the spent slurry (leftover sludge) in biogas production used for?