Why is magnesium essential for plants?

Explanation

**Step-by-Step Solution:**

1. **Identify Magnesium as a Macronutrient**: Magnesium is classified as a macronutrient, meaning that plants require it in relatively large amounts for their growth and development.

2. **Role in Chlorophyll Formation**: One of the primary functions of magnesium in plants is its role as a central component of chlorophyll, the pigment responsible for photosynthesis. Without magnesium, chlorophyll cannot be formed, which would hinder the plant's ability to perform photosynthesis effectively.

3. **Involvement in Photosynthesis**: Since magnesium is part of chlorophyll, it directly influences the process of photosynthesis, where plants convert light energy into chemical energy. This is crucial for the plant's energy production and overall growth.

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