Choose the correct sequence of microbes involved in biogas production-

Options

A. Fragmentative microbes, decomposers methanogens
B. Decomposers, methanogens, putrefying microbes
C. Putrefying microbes, methanogens, saprophytic microbes
D. Decomposers fermentative microbes, methanogens

Answer

To determine the correct sequence of microbes involved in biogas production, we can break down the process into distinct steps. Here’s a step-by-step explanation:

### Step-by-Step Solution:

1. **Organic Material Breakdown**: The process begins with the presence of organic material, such as starch or other biodegradable waste. This organic matter is the primary substrate for biogas production.

2. **Role of Decomposers**: The first group of microbes involved in biogas production are decomposers. These microorganisms break down the organic matter into simpler compounds. They play a crucial role in the initial digestion of the organic material.

3. **Fermentation by Fermentative Microbes**: After the decomposers have acted on the organic matter, the next step involves fermentative microbes. These microbes further break down the simpler compounds produced by the decomposers through fermentation. This process generates intermediate products such as fatty acids, alcohols, and carbon dioxide.

4. **Methanogenic Bacteria**: The final step involves methanogenic bacteria, which are a specific group of archaea that convert the products of fermentation into methane and carbon dioxide. This step is critical as it leads to the production of biogas, which is primarily composed of methane.

5. **Final Sequence**: Therefore, the correct sequence of microbes involved in biogas production is:
- Decomposers → Fermentative Microbes → Methanogens

### Conclusion:
The correct answer to the question is the sequence: Decomposers → Fermentative Microbes → Methanogens.

---