Select the odd one out from the following w.r.t. macronutrient.

Options

A. Nitrogen
B. Phosphorus
C. Iron
D. Sulphur

Answer

To solve the question of selecting the odd one out with respect to macronutrients from the options given (nitrogen, phosphorus, iron, and sulphur), we can follow these steps:

### Step-by-Step Solution:

1. **Identify Macronutrients**: Understand what macronutrients are. Macronutrients are essential nutrients that plants require in large amounts for their growth and development. Common macronutrients include nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur.

2. **List the Given Nutrients**: The nutrients provided in the question are:
- Nitrogen
- Phosphorus
- Iron
- Sulfur

3. **Classify Each Nutrient**:
- **Nitrogen**: This is a macronutrient.
- **Phosphorus**: This is also a macronutrient.
- **Iron**: This is a micronutrient, which means it is needed in smaller amounts compared to macronutrients.
- **Sulfur**: This is a macronutrient.

4. **Determine the Odd One Out**: Since nitrogen, phosphorus, and sulfur are all macronutrients, while iron is a micronutrient, the odd one out is **iron**.

5. **Conclusion**: Therefore, the correct answer is **iron**.