Match the column and choose the correct answers:
`{:("Column I","Column II"),(A."Thiobacillus",i."Nitrogen-fixation"),(B."Nitrosomonas",ii."Ammonifiation"),(C."Azotobacter",iii."Nitrification"),(D."Clostridium",iv."Denitrificaion"):}`

Options

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

Answer

To solve the matching question, we need to identify the correct functions of the bacteria listed in Column I and match them with the appropriate descriptions in Column II. Let's break it down step by step.

### Step 1: Identify the function of Thiobacillus
- **Thiobacillus** is known for its role in **denitrification**, which is the process of converting nitrate ions into nitrogen gas.
- **Match**: A → iv (Denitrification)

### Step 2: Identify the function of Nitrosomonas
- **Nitrosomonas** is a type of nitrifying bacteria that oxidizes ammonia into nitrite, which is part of the nitrification process.
- **Match**: B → iii (Nitrification)

### Step 3: Identify the function of Azotobacter
- **Azotobacter** is a free-living nitrogen-fixing bacterium that converts atmospheric nitrogen into ammonia, which is known as nitrogen fixation.
- **Match**: C → i (Nitrogen-fixation)

### Step 4: Identify the function of Clostridium
- **Clostridium** is involved in **ammonification**, which is the process of decomposing organic nitrogen from dead plants and animals into ammonia.
- **Match**: D → ii (Ammonification)

### Final Matching Result
- A → iv (Thiobacillus - Denitrification)
- B → iii (Nitrosomonas - Nitrification)
- C → i (Azotobacter - Nitrogen-fixation)
- D → ii (Clostridium - Ammonification)

### Summary of Matches
- A: Thiobacillus → iv (Denitrification)
- B: Nitrosomonas → iii (Nitrification)
- C: Azotobacter → i (Nitrogen-fixation)
- D: Clostridium → ii (Ammonification)