What happens to primary phloem in secondary growth in dicot root?

Explanation

### Step-by-Step Solution:

1. **Understanding Secondary Growth**: In dicot plants, secondary growth refers to the increase in thickness or girth of the plant due to the activity of the vascular cambium. This growth occurs after the primary growth, which is responsible for the elongation of the plant.

2. **Role of Vascular Cambium**: The vascular cambium is a layer of meristematic tissue that produces new cells. During secondary growth, it forms secondary phloem and secondary xylem. The secondary phloem is produced centrifugally (outward), while the secondary xylem is produced centripetally (inward).

3. **Effect on Primary Phloem**: As the vascular cambium produces new secondary phloem cells, the existing primary phloem is pushed outward. This outward movement compresses the primary phloem.

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