The bacteria that produce methane in a biogas plant are called

1. Biogas is produced by microbial action on organic waste. 2. The bacteria responsible grow anaerobically and produce methane. 3. They are called methanogens, and Methanobacterium is a common example. 4. They are also found in the rumen of cattle, which is why cattle dung is used. 5. Nitrifiers and denitrifiers act on nitrogen compounds, not on methane. _Source: NCERT Class 12 Biology Ch8 'Microbes in Human Welfare'_