What use are phloem fibres put to ?

Explanation

### Step-by-Step Solution:

1. **Understanding Phloem Fibers**: Phloem fibers are a type of vascular tissue found in plants. They are primarily responsible for providing mechanical support to the plant.

2. **Composition of Phloem Fibers**: These fibers are composed of lignified cells, which means they have a thickened cell wall made of lignin. This lignin deposition is crucial for their strength.

3. **Function of Phloem Fibers**: The primary function of phloem fibers is to provide mechanical strength to the plant. This helps the plant maintain its structure and withstand various physical stresses.

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