What is the composition of the biogas?

In India,the technology of biogas production was developed mainly by the efforts of which organizations?

Which one of the following is the $CORRECT$ order of conversion of waste materials during biogas formation?

Consider the following statements about methanogenic bacteria:
$I.$ Methanogenic bacteria are commonly found in the anaerobic sludge formed during sewage treatment.
$II.$ These bacteria also occur in the rumen of cattle,where they act upon cellulosic material to break down cellulose.
$III.$ They play a very important role in the nutrition of cattle by digesting cellulosic material.
Which of the statements given above are correct?

$S$ Statement: $Halophilus$ is responsible for the production of biogas. $R$ Statement: $Halophilus$ is an example of the $Bacteria$ domain.

Provide information about a biogas plant.