A plant requires magnesium for :

Options

A. Cell wall development
B. Holding cells together
C. Protein synthesis
D. Chlorophyll synthesis

Answer

**Step-by-Step Solution:**

1. **Identify the Role of Magnesium in Plants:**
- Magnesium is an essential macronutrient required by plants in large amounts. It plays a crucial role in various physiological processes.

2. **Understand the Functions of Magnesium:**
- Magnesium is primarily involved in the synthesis of chlorophyll, which is vital for photosynthesis. Chlorophyll is the pigment that allows plants to capture sunlight and convert it into energy.

3. **Evaluate the Options Provided:**
- The question provides four options regarding the role of magnesium in plants:
- a) Cell wall development
- b) Holding cells together
- c) Protein synthesis
- d) Chlorophyll synthesis

4. **Analyze Each Option:**
- **Option a: Cell wall development** - This is incorrect. Calcium is the primary element involved in cell wall development.
- **Option b: Holding cells together** - This is also incorrect. The holding of cells together is mainly due to pectin in the middle lamella, which is influenced by calcium.
- **Option c: Protein synthesis** - This is incorrect as well. The primary elements required for protein synthesis are carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur, but not magnesium.
- **Option d: Chlorophyll synthesis** - This is correct. Magnesium is essential for the synthesis of chlorophyll.

5. **Conclusion:**
- Therefore, the correct answer is that a plant requires magnesium for **chlorophyll synthesis**.