Magnesium deficiency symptoms are often characterized by chlorosis and reduced photosynthetic rates. What is the main reason for these symptoms?

Explanation

### Step-by-Step Solution:

1. **Understanding Magnesium's Role**: Magnesium is an essential nutrient for plants and is a crucial component of chlorophyll, the pigment responsible for photosynthesis.

2. **Chlorophyll and Photosynthesis**: Chlorophyll plays a vital role in the process of photosynthesis, where plants convert light energy into chemical energy. It absorbs light, primarily in the blue and red wavelengths, and reflects green light, which is why plants appear green.

3. **Impact of Magnesium Deficiency**: When there is a deficiency of magnesium in plants, the synthesis of chlorophyll is impaired. This leads to a decrease in the amount of chlorophyll available for photosynthesis.

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