What is produced by methanogens, when it grow anaerobically on cellulosic material ?

Methane, carbon dioxide, hydrogen.

When methanogens grow anaerobically on cellulosic material, they produce methane (CH4), carbon dioxide (CO2), and small amounts of hydrogen (H2) as metabolic byproducts.

Methanogens are a group of microorganisms that belong to the domain Archaea and are known for their ability to produce methane through a process called methanogenesis. Methanogenesis involves the breakdown of complex organic compounds, such as cellulosic material, into simpler molecules.

During the anaerobic digestion process, methanogens first break down the cellulosic material into intermediate products, including carbon dioxide and hydrogen. These intermediates are then utilized by methanogens to produce methane gas. Methane is the primary end product of methanogenesis.

Additionally, a small amount of hydrogen gas is also produced as a byproduct during methanogenesis. However, the main product is methane, with carbon dioxide being another significant gas produced in the process.

Therefore, when methanogens grow anaerobically on cellulosic material, they produce methane, carbon dioxide, and small amounts of hydrogen.