Overview
This lecture covers the roles of vascular tissues in plants, specifically xylem and phloem, and how they transport water, minerals, and sugars throughout the plant.
Plant Vascular Systems
- Vascular plants have specialized tissues called xylem and phloem, acting like veins for transport.
- Xylem carries water (Hâ‚‚O) and minerals from roots up the stem to other parts of the plant.
- Phloem transports sugars (food made by leaves) to cells throughout the plant.
- Both xylem and phloem function as pipes within plant tissues.
Functions of Xylem and Phloem
- Xylem enables transpiration by pulling water and minerals upward, hydrating the plant.
- Phloem distributes the sugars produced by green leaves to where energy is needed for plant growth.
- The coordinated action of xylem and phloem ensures water, minerals, and nutrients circulate efficiently.
Key Terms & Definitions
- Xylem — plant tissue responsible for transporting water and minerals from roots to leaves.
- Phloem — plant tissue responsible for transporting sugars and nutrients produced in leaves to other plant parts.
- Transpiration — the process of water movement through a plant and its evaporation from aerial parts like leaves.
Action Items / Next Steps
- Review diagrams of xylem and phloem pathways in vascular plants.
- Prepare for a quiz on plant tissue functions.