Which one is wrongly matched?

Options

A. Streptomyces - Antibiotics
B. Coliforms - Vinegar
C. Methanogens - Gobar gas
D. Yeast - Ethanol

Answer

To determine which option is wrongly matched, we will analyze each pairing step by step.

### Step 1: Analyze the first option - Streptomyces and antibiotics
- **Explanation**: Streptomyces is a genus of bacteria known for its role in producing antibiotics, including streptomycin and other important drugs.
- **Conclusion**: This pairing is correctly matched.

### Step 2: Analyze the second option - Methanogens and cobalt gas
- **Explanation**: Methanogens are microorganisms that produce methane gas (not cobalt gas) during the process of methanogenesis. They play a crucial role in breaking down organic matter in anaerobic conditions.
- **Conclusion**: This pairing is incorrectly matched.

### Step 3: Analyze the third option - Yeast and ethanol
- **Explanation**: Yeast, particularly Saccharomyces cerevisiae, is used in fermentation processes to convert sugars into ethanol and carbon dioxide. This is widely used in the production of alcoholic beverages and bread.
- **Conclusion**: This pairing is correctly matched.

### Step 4: Analyze the fourth option - Coliforms and vinegar
- **Explanation**: Coliforms are a group of bacteria commonly found in the environment, including in feces. They are indicators of water quality and contamination. They are not directly related to vinegar production, which is typically made using acetic acid bacteria.
- **Conclusion**: This pairing is incorrectly matched.

### Final Conclusion
The wrongly matched options are:
1. Methanogens and cobalt gas
2. Coliforms and vinegar

However, since the question asks for one wrongly matched pair, the most clear and direct incorrect match is **Methanogens and cobalt gas**.