What group do methanogens belong to?

Archaebacteria

The correct answer is Option (2) - Archaebacteria

Methanogens are the group of primitive prokaryotes responsible for producing biogas from the dung of ruminant animals. These microorganisms belong to the domain Archaea and are specifically known for their ability to produce methane gas as a byproduct of their metabolic processes.

Methanogens are present in the gut of several ruminant animals such as cows and buffaloes and they are responsible for the production of methane (biogas) from the dung of these animals. They digest these compounds and produce methane gas as a metabolic byproduct through a process called methanogenesis.

This methane produced by methanogens is commonly utilized as biogas. Biogas is a renewable energy source that can be harnessed and used as a sustainable energy supply for various purposes, including heating and electricity generation.