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

Assertion $A$: Herbivores release methane gas into the atmosphere.
Reason $R$: Herbivores consume a cellulose-rich diet.
Which option is correct for Assertion $A$ and Reason $R$?

In biogas production,the decomposition of dung to produce gas is carried out by which of the following?

Describe the contribution of microbes in the production of biogas.

Methanogens,particularly $Methanobacterium$,grow anaerobically on cellulosic material and produce:
$I.$ Methane
$II.$ Carbon dioxide
$III.$ Oxygen
$IV.$ Ethane
Choose the correct option.

$A$: Biogas is a mixture of various gases.
$R$: The type of gases produced depends on the microbes and the organic substrate used.