How do methanogens help in producing biogas?

Explanation

**Step-by-Step Solution:**

1. **Understanding Methanogens**: Methanogens are a group of anaerobic bacteria that thrive in environments devoid of oxygen. They play a crucial role in the anaerobic digestion process, where they convert organic materials into methane and other gases.

2. **Organic Waste as a Substrate**: Methanogens primarily utilize organic waste, particularly materials rich in cellulose, such as plant matter and animal waste. This organic waste serves as the substrate for their growth and metabolism.

3. **Anaerobic Digestion Process**: In the absence of oxygen, methanogens metabolize the organic waste. This process involves breaking down complex organic compounds into simpler molecules. The metabolic activities of methanogens lead to the production of gaseous end products.

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