Which one of the following is wrongly matched .

Options

A. Methanogens - Gobar gas
B. Yeast - Ethanol
C. Streptomycetes - Antibiotic
D. Coliform - Vinegar .

Answer

To determine which of the following pairs is wrongly matched, we will analyze each option provided:

1. **Methanogens - Cow dung gas**:
- Methanogens are a group of bacteria that produce methane gas through anaerobic fermentation.
- Cow dung is often used in biogas production, which is commonly referred to as cow dung gas.
- Therefore, this match is **correct**.

2. **Yeast - Ethanol**:
- Yeast is a unicellular fungus that ferments sugars to produce ethanol and carbon dioxide in the absence of oxygen.
- This process is widely used in the production of alcoholic beverages and bread.
- Thus, this match is **correct**.

3. **Streptomycetes - Antibiotics**:
- Streptomycetes are a genus of bacteria known for their ability to produce antibiotics, which are used to kill or inhibit the growth of other bacteria.
- This match is also **correct**.

4. **Coliform - Vinegar**:
- Coliform bacteria are a group of bacteria commonly found in the environment, including in feces. They are used as indicators of water contamination.
- Vinegar is produced through the fermentation of ethanol by acetic acid bacteria, not coliform bacteria.
- Therefore, this match is **incorrect**.

Based on the analysis, the wrongly matched pair is **Coliform - Vinegar**.

### Final Answer:
The wrongly matched pair is **Coliform - Vinegar**.