Question

Which bacteria are utilized in gobar gas plant?

• A. Methanogens
• B. Nitrifying bacteria
• C. Ammonifying bacteria
• D. Denitrifying bacteria

Answer 1

The correct option is A Methanogens

Gobar gas is mixture of methane (CH${}_4$), carbon dioxide (CO${}_2$), hydrogen (H${}_2$) and hydrogen sulphide (H${}_2$S) with methane as major component (65%). Methanogens are anaerobic, autotrophic, eukaryote that converts carbon dioxide and hydrogen into methane gas. The hydrogen serves as electron donor for reduction of carbon dioxide. Thus, methogens produce gober gas by anerobic fermentation of biomass in presence of water. The chemolithotrophic bacteria that reduce the organic nitrogen into ammonia are termed as ammonifying bacteria. The chemolithotropic bacteria that converts ammonia NH${}_3$ into nitrates, NO${}_3$-, are termed as nitrifying bacteria; it includes Nitrosomonas and Nitrobacter. The chemolithotrophic bacteria that reduce the nitrates into nitrogen are termed as denitrifying bacteria. Ammonifying, nitrifying and denitrifying bacteria are component of nitrogen cycle and do not serve in gober gas (methane) production. Thus, the correct answer is option A.