Match the column and choose the correct option
`{:("Column I","Column II"),(A."Free-living aerobic nitrogen fixers",i."Anabaena and Nostoc"),(B."Anaerobic nitrogen",ii."Pseudomonas and Thiobacillus"),(C."Nitrogen-fixing",iii."Nitrosomonas and Nitrosococcus"),(D."Denitrifying bacteria",iv."Azotobacter and beijerinckia"),(E."Nitrigying bacteria",v."Rhodospirillum"):}`

Options

A. a-iv,b-v,c-I,d-ii,e-iii
B. a-v,b-iv,c-iii,d-ii,e-i
C. a-iv,b-v,c-iii,d-ii,e-i
D. a-iv,b-iii,c-I,d-ii,e-v

Answer

To solve the matching question, we need to identify the correct pairs of nitrogen-fixing and related bacteria with their respective categories. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Identify Free-living Aerobic Nitrogen Fixers (A)**:
- Free-living aerobic nitrogen-fixing bacteria are known to include **Azotobacter and Beijerinckia**.
- **Match**: A → iv

2. **Identify Anaerobic Nitrogen Fixers (B)**:
- Anaerobic nitrogen-fixing bacteria include **Rhodospirillum**.
- **Match**: B → v

3. **Identify Nitrogen-fixing Cyanobacteria (C)**:
- Nitrogen-fixing cyanobacteria are represented by **Anabaena and Nostoc**.
- **Match**: C → i

4. **Identify Denitrifying Bacteria (D)**:
- Denitrifying bacteria include **Pseudomonas and Thiobacillus**.
- **Match**: D → ii

5. **Identify Nitrifying Bacteria (E)**:
- Nitrifying bacteria include **Nitrosomonas and Nitrosococcus**.
- **Match**: E → iii

### Final Matches:
- A → iv (Azotobacter and Beijerinckia)
- B → v (Rhodospirillum)
- C → i (Anabaena and Nostoc)
- D → ii (Pseudomonas and Thiobacillus)
- E → iii (Nitrosomonas and Nitrosococcus)

### Conclusion:
The correct option for the matches is:
- A matches with iv
- B matches with v
- C matches with i
- D matches with ii
- E matches with iii

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