In a typical biogas plant, methanogens grow anaerobically on cellulosic materials present in cow dung. Which of the following represents the correct combination of gases primarily produced by these bacteria during this process?

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In a biogas plant, certain bacteria grow anaerobically on cellulosic material present in cow dung to produce a large amount of methane along with carbon dioxide and hydrogen. These bacteria are collectively called methanogens, with Methanobacterium being a common example. The mixture of gases produced is called biogas, which predominantly consists of methane ( CH₄ ), carbon dioxide ( CO₂ ), and hydrogen ( H₂ ). Answer: Methane, Carbon dioxide, and Hydrogen