Which of the following is an micronutrient ?

Options

A. Mg
B. Zn
C. Ca
D. P

Answer

To determine which of the following options is a micronutrient, we can follow these steps:

1. **Understand the Definitions**:
- Micronutrients are essential nutrients that are required by plants in smaller amounts, typically less than 10 millimoles per kilogram of plant tissue.
- Macronutrients are required in larger amounts, typically more than 10 millimoles per kilogram.

2. **Identify the Options**:
- The options given are Magnesium, Zinc, Calcium, and Phosphorus.

3. **Classify Each Option**:
- Magnesium: This is a macronutrient, as it is required in larger quantities by plants.
- Zinc: This is a micronutrient, as it is needed in smaller amounts.
- Calcium: This is also a macronutrient, required in larger quantities.
- Phosphorus: This is another macronutrient, needed in larger quantities.

4. **Conclusion**:
- From the analysis, the only micronutrient among the options provided is Zinc.

Thus, the answer is **Zinc**.