By: Glory Dawn
Phloem & Xylem
What is Phloem?
The vascular tissue in plants that conducts sugars and other metabolic products downward from the leaves.
- Consists of hollow tubes (sieve tubes) that run parallel to the long axis of the plant organ
- Formed from elongated cells (sieve elements) joined end to end and closely associated with companion cells
- The end wall cells are broken down to a greater or lesser extent to allow passage of materials
- In young plants and in newly formed tissues of mature plants primary phloem is formed by the activity of the apical meristem
What is Xylem?
The vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps to form the woody element in the stem.
- Cell which is responsible for providing support to a plant
- The cells make up the vascular system of plants, conducting water throughout the plant and providing circulation
- Without xylem cells a plant would have no vascular system
- When exiled cells die, it can still act as a support network for the plant, because the lignin in the cell walls is intact