Question

In biogas plant, the organic acids like acetic acid is converted to biogas by the enzymes of ___________.

• A. Methanococcus and Methanobacillus
• B. Clostridium and Pseudomonas
• C. Azotobacter and Azospirillum
• D. Bacillus subtilis

Hint:

Methanogens are archaea that produce methane under anaerobic conditions.

Answer 1

The Correct Option is A

Step 1: Understanding biogas production.
Biogas production occurs through anaerobic digestion of organic matter in a biogas plant. This process involves multiple groups of microorganisms acting sequentially.
Step 2: Role of methanogens.
Organic acids such as acetic acid are finally converted into methane-rich biogas by methanogenic archaea. The most important methanogens involved are Methanococcus and Methanobacillus.
Step 3: Analysis of options.
(A) Correct — these are methanogenic microorganisms responsible for methane formation.
(B) Incorrect — these are fermentative bacteria, not methanogens.
(C) Incorrect — nitrogen-fixing bacteria, unrelated to biogas formation.
(D) Incorrect — involved in decomposition, not methane production.
Step 4: Conclusion.
Acetic acid is converted into biogas by enzymes of Methanococcus and Methanobacillus.