Which of the following is a micronutrient for plants?

Options

A. A. Sulphur
B. B. Manganese
C. C. Magnesium
D. D. Phosphorus

Explanation

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

### Step 1: Understand the Definitions
- **Micronutrients** are essential nutrients that plants need in small quantities. They play crucial roles in various physiological functions.

### Step 2: Identify the Options
The options provided are:
1. Sulphur
2. Manganese
3. Magnesium
4. Phosphorus

### Step 3: Classify the Nutrients
- **Macronutrients** are required in larger quantities (e.g., nitrogen, phosphorus, potassium).
- **Micronutrients** are required in smaller quantities (e.g., iron, manganese, zinc).

### Step 4: Analyze Each Option
- **Sulphur**: While it is important for plants, it is generally classified as a macronutrient because it is required in moderate amounts.
- **Manganese**: This is classified as a micronutrient. It is essential for the synthesis of chlorophyll and the activation of enzymes involved in respiration and metabolism.
- **Magnesium**: This is also considered a macronutrient as it is needed in larger quantities for chlorophyll production and other functions.
- **Phosphorus**: This is classified as a macronutrient as well, important for energy transfer and photosynthesis.

### Step 5: Conclusion
Based on the analysis, the only micronutrient listed is **Manganese**.

### Final Answer
The answer is **B. Manganese**.

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