`{:(,,"Column I","Column II"),(,I,"Streptomyces","A. Nitrogen fixation"),(,II,"Rhizobium","B. Source of antibiotics"),(,III,"Nitrosomonas","C. Vinegar synthesis"),(,IV,"Acetobacter","D. Nitrification"):}`
Which of the combination is correct?

Options

A. I-B, II-A, III-D, IV-C
B. I-C, II-D, III-A, IV-B
C. I-A, II-B, III-C, IV-D
D. I-D, II-B, III-A, IV-C

Answer

To solve the question, we need to match the organisms in Column I with their respective functions in Column II. Let's analyze each organism one by one:

1. **Streptomyces**:
- Streptomyces is a genus of bacteria known for its ability to produce antibiotics. Therefore, the correct match is:
- **Streptomyces → B. Source of antibiotics**

2. **Rhizobium**:
- Rhizobium is a genus of bacteria that forms symbiotic relationships with legumes and is well-known for its role in nitrogen fixation. Thus, the correct match is:
- **Rhizobium → A. Nitrogen fixation**

3. **Nitrosomonas**:
- Nitrosomonas is a type of bacteria involved in the nitrification process, where it converts ammonia into nitrites. Hence, the correct match is:
- **Nitrosomonas → D. Nitrification**

4. **Acetobacter**:
- Acetobacter is a genus of bacteria that is used in the production of vinegar through the fermentation of ethanol. Therefore, the correct match is:
- **Acetobacter → C. Vinegar synthesis**

Now, summarizing the matches:
- I → B
- II → A
- III → D
- IV → C

Thus, the correct combination is:
- **I: B, II: A, III: D, IV: C**

The final answer is option 1.