What is the role of magnesium in the metabolism of plant?

Explanation

### Step-by-Step Solution:

1. **Activation of Enzymes**:
- Magnesium plays a crucial role in activating enzymes that are essential for various metabolic processes in plants. One of the key processes it activates is the Calvin cycle, which is vital for photosynthesis.

2. **Role in Carbon Fixation**:
- By stimulating the Calvin cycle, magnesium helps in the fixation of carbon dioxide. This process is fundamental for the synthesis of organic compounds that plants use for energy and growth.

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