8.1 Importance of Transport in Plants
- Transport Systems: Xylem (water and minerals), Phloem (sugars).
8.2 Xylem and Phloem
| Tissue | Structure | Function |
|---|
| Xylem | Dead cells with thick walls | Transports water and minerals upwards. |
| Phloem | Living cells with sieve plates | Transports sugars and amino acids. |
8.3 Water Uptake by Roots
- Root Hair Cells: Absorb water and minerals from the soil.
- Osmosis: Water moves from higher to lower water potential.
8.4 Movement of Water through the Plant
- Transpiration Pull: Water evaporates from leaves, pulling more water up through the xylem.
8.5 Transpiration
- Definition: Loss of water vapor from leaves via stomata.
- Factors Affecting Transpiration:
- Temperature, humidity, wind, and light intensity.
8.6 Translocation
- Movement of sugars and amino acids in phloem from source (leaves) to sink (roots, fruits).