1. Leaves: Structure and Function

2. Main Functions 1. Principle sites of photosynthesis
6CO H2O O C6H12O6
2. Gas Exchange
3. Water Movement

4. Structures 1. Blade: flattened area, has a network of veins
2. Petiole: connects leaf to stem

5. Leaf Scars and Bundle Scars…

9. Black Walnut
What does the leaf scar and bundle scar pattern resemble here?????

10. Structure 3. VEINS: Vascular bundles Made up of:
XYLEM: transports water and minerals
PHLOEM: transports food

11. STRUCTURE 4. Epidermis: Covers entire surface (upper and lower)
Waxy transparent layer: Cuticle
Protection:
Temp
Wind
Disease

12. 5. Mesophyll: between 2 layers of epidermis, chloroplasts in this layer

13. STRUCTURE 6. Stomates: Opening in underside of leaf
Gas Exchange: Which Gases?
CO2 O2
Transpiration: water movement
Open in daylight, closed in darkness
7. Guard Cells: Controls stomate opening
Filled with water, stoma is open
Water is removed, stoma closes

15. Stomate Open