In a biogas plant, certain bacteria are utilized for the production of methane gas from cattle dung. Identify the broad taxonomic group to which these bacteria belong, and another natural habitat where they are commonly found.

Step-by-step solution

The bacteria responsible for the production of methane (biogas) from cattle dung are methanogens. Methanogens are a type of Archaebacteria. According to NCERT, apart from the gut of ruminants, methanogens are naturally found in marshy areas. Therefore, the correct taxonomic group is Archaebacteria and their other common natural habitat is marshy areas. Eubacteria is incorrect as methanogens belong to Archaebacteria. Salty areas and hot springs are habitats for halophiles and thermoacidophiles, respectively. Answer: