Match the column - I with column - II
`{:(,"Column - I",,"Column - II"),(1., "Micronutrients",A.,Fe),(2.,"Macronutrients ",B.,"Nitrosomonas"),(3.,"Nitrification",C.,S),(4.,"Denitrification",D.,"Thiobacillus"):}`

Options

A. 1 - C , 2 - A , 3 - D , 4 - B
B. 1 - C , 2 - A , B , 4 - D
C. 1 - A , 2 - C , 3 - D , 4 - B
D. 1 - A , 2 - C , 3 - B , 4 - D

Answer

To solve the question of matching Column I with Column II, we will analyze each item in Column I and find the corresponding match in Column II based on the definitions and characteristics of each term.

### Step-by-Step Solution:

1. **Micronutrients**:
- Micronutrients are essential elements required by plants in trace amounts. Common examples include Iron (Fe), Zinc, Boron, and Copper.
- From Column II, the only option that fits as a micronutrient is **A. Fe**.
- **Match**: 1 → A

2. **Macronutrients**:
- Macronutrients are nutrients required by plants in larger quantities. They include elements like Nitrogen, Phosphorus, Sulfur, Potassium, and Calcium.
- From Column II, the only option that fits as a macronutrient is **C. S** (Sulfur).
- **Match**: 2 → C

3. **Nitrification**:
- Nitrification is the biological process where ammonia is converted into nitrites and then nitrates, primarily carried out by specific bacteria. The bacteria responsible for this process are **Nitrosomonas**.
- From Column II, the matching option is **B. Nitrosomonas**.
- **Match**: 3 → B

4. **Denitrification**:
- Denitrification is the process where nitrates are reduced to nitrogen gas, which is carried out by various bacteria, including **Thiobacillus**.
- From Column II, the matching option is **D. Thiobacillus**.
- **Match**: 4 → D

### Final Matches:
- 1 → A (Micronutrients → Fe)
- 2 → C (Macronutrients → S)
- 3 → B (Nitrification → Nitrosomonas)
- 4 → D (Denitrification → Thiobacillus)

### Answer:
The correct matching is:
1. A
2. C
3. B
4. D