Pollution from animal excreta and organic waste from the kitchen can be most profitably minimized by

Which organization developed the biogas technology in India?

Give scientific reasons: Why are biogas plants more commonly found in rural areas?

Biogas contains:

Which of the following is primarily produced by the activity of anaerobic bacteria on sewage?

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?