Which one of the following is the correct order of conversion of waste materials during biogas formation

Options

A. Monomers `rarr` Polymers Methane organic acids
B. Organic acids Methane Polymers Monomers
C. Methane organic acids Polyumers Monomers
D. Polymers Monomers Organic acids Methane

Answer

To answer the question regarding the correct order of conversion of waste materials during biogas formation, we can break down the process into three main stages:

### Step-by-Step Solution:

1. **Solubilization**: The first step in biogas formation is solubilization. In this stage, complex organic materials (polymers) such as cellulose, hemicellulose, fats, and proteins are broken down into simpler compounds (monomers) by the action of decomposer microbes. This process is crucial as it prepares the organic materials for further breakdown.

2. **Acidogenesis**: The second step is acidogenesis. In this stage, the monomers produced from solubilization are converted into organic acids, with acetic acid being the most common. This conversion is facilitated by fermentative microbes. Acidogenesis is essential as it transforms the simpler compounds into acids that can be further processed.

3. **Methanogenesis**: The final step is methanogenesis. In this stage, the organic acids produced during acidogenesis are converted into biogas, primarily methane (CH4). This conversion is carried out by methanogenic bacteria, which are specialized microbes that thrive in anaerobic conditions. Methanogenesis is the key step that produces the biogas that can be utilized as a renewable energy source.

### Summary of the Order:
The correct order of conversion during biogas formation is:
- **Polymers → Monomers → Organic Acids → Methane (Biogas)**

### Conclusion:
Thus, the correct answer to the question is option number 4, which follows the order: polymers, monomers, organic acids, and methane.

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