What happens when the tree gets injured? Name the structures responsible for that.

Explanation

### Step-by-Step Solution:

1. **Understanding Tree Injury**: When a tree gets injured, it experiences damage to its tissues, which can disrupt its normal functioning. This injury can occur due to various reasons such as physical damage, disease, or pests.

2. **Role of Xylem Tissue**: The xylem tissue is responsible for transporting water and nutrients from the roots to the rest of the tree. It plays a crucial role in maintaining the tree's health and hydration.

3. **Formation of Phellem**: In response to injury, the tree forms protective structures known as phellem (also called cork). Phellem is part of the periderm and helps to protect the inner tissues from further damage and water loss.

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