Which is not correctly matched

Options

A. Azotobacter- Nitrogen fixation
B. Streptococcus thermophilus- Yogurt
C. Chlorobium - Photosynthesis
D. Streptomyces rimosus -Chloromycetin.

Answer

To determine which option is not correctly matched, we will analyze each pair one by one.

### Step 1: Analyze Azotobacter and Nitrogen Fixation
- Azotobacter is a free-living bacterium known for its ability to fix atmospheric nitrogen into a form that plants can use.
- **Conclusion**: This match is correct.

### Step 2: Analyze Streptococcus thermophilus and Yogurt
- Streptococcus thermophilus is a bacterium that is commonly used in the production of yogurt. It ferments lactose, the sugar found in milk, to produce lactic acid, which helps in yogurt formation.
- **Conclusion**: This match is correct.

### Step 3: Analyze Chlorobium and Photosynthesis
- Chlorobium is a genus of green sulfur bacteria that can perform photosynthesis. They contain chlorophyll and can convert light energy into chemical energy.
- **Conclusion**: This match is correct.

### Step 4: Analyze Streptomyces ramosus and Chloromycetin
- Streptomyces ramosus is a gram-positive bacterium known for producing the antibiotic chloramphenicol, not chloromycetin (which is another name for chloramphenicol).
- **Conclusion**: This match is incorrect because the name "chloromycetein" is not the correct term associated with Streptomyces ramosus.

### Final Conclusion
- The option that is not correctly matched is **Streptomyces ramosus and chloromycetein**.

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