Overview
This lecture explains the role of xylem in plants, focusing on how water moves from roots to leaves through the stem, and includes a simple science experiment to visualize this process.
What is Xylem?
- Xylem is a tube-like tissue responsible for transporting water and nutrients from the roots to all parts of the plant.
- Xylem is part of the plant's vascular bundle, which is the plant's transport system.
How Water Moves in Plants
- Water is absorbed by plant roots from the soil.
- Water travels upward from the roots through the xylem in the stem.
- The xylem delivers water and nutrients to the leaves and other parts of the plant.
Science Experiment: Observing Water Movement
- Cut a stalk of celery or cabbage and place it in colored water.
- Over time, colored water moves up the stem and into the leaves, visibly marking the xylem pathways.
- This color change shows the path water takes as it is transported through the xylem.
Importance of Xylem Function
- The movement of water via xylem is essential for plant survival, growth, and nutrient distribution.
- Without functioning xylem, plants cannot transport water and would wilt or die.
Key Terms & Definitions
- Xylem — Specialized plant tissue that transports water and nutrients from roots to the rest of the plant.
- Vascular bundle — A group of transport tissues (including xylem and phloem) in plants.
- Transport system — The system responsible for moving substances like water and nutrients throughout the plant.
Action Items / Next Steps
- Try the celery or cabbage coloring experiment at home or in class.
- Review plant tissue types and their functions for homework.