Mathanogens do not produce

Options

A. oxygen
B. methane
C. hydrogen sulphide
D. carbon dioxide

Answer

**Step-by-Step Solution:**

1. **Understanding Methanogens**: Methanogens are a type of microorganism classified as archaebacteria. They are known for their ability to produce methane as a major metabolic by-product.

2. **Conditions of Production**: Methanogens thrive in anaerobic (absence of oxygen) or hypoxic (low oxygen) conditions. This environment is crucial for their metabolic processes.

3. **By-products of Methanogenesis**: In addition to methane, methanogens also produce other gases as by-products. These include carbon dioxide, hydrogen sulfide, and hydrogen.

4. **Analyzing the Options**: The question asks which of the following is not produced by methanogens:
- A) Oxygen
- B) Methane
- C) Hydrogen sulfide
- D) Carbon dioxide

5. **Identifying the Correct Answer**:
- Methanogens do **not** produce oxygen because they operate in environments where oxygen is absent.
- They do produce methane, hydrogen sulfide, and carbon dioxide.

6. **Conclusion**: Therefore, the correct answer to the question "Methanogens do not produce" is **A) Oxygen**.

---