What are the constituents of xylem?

Explanation

### Step-by-Step Solution:

1. **Definition of Xylem**:
- Xylem is a type of complex permanent tissue that is part of the vascular tissue system in plants. It primarily functions in the transport of water and minerals from the roots to the stems and leaves, and it also provides mechanical strength to the plant.

2. **Main Constituents of Xylem**:
- Xylem is composed of three main elements:
- **Trachea Elements**
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