1. The primary PHOTOSYNTHETIC ORGAN
LEAVES
The primary PHOTOSYNTHETIC ORGAN

2. FUNCTIONS of LEAVES PHOTOSYNTHESIS
Conversion of LIGHT ENERGY into SUGARS
CARBON DIOXIDE (CO2) and WATER (H2O) needed
RESPIRATION (leaves, stems and roots)
Breakdown of SUGAR into ENERGY
ENERGY is needed for GROWTH and to MANUFACTURE other compounds
OXYGEN (O2) needed

3. FUNCTIONS of LEAVES

4. FUNCTIONS of LEAVES

5. FUNCTION of LEAVES

6. FUNCTIONS of LEAVES TRANSPIRATION
DIFFUSION of WATER VAPOR out of leaves through STOMATA
GAS EXCHANGE
TRANSPIRATIONAL PULL
COOLING

7. PARTS of a LEAF

8. CLASSIFICATION of LEAVES
SIMPLE -one blade /petiole
COMPOUND – many leaflets/petiole –rachis

9. CLASSIFICATION of LEAVES
VENATION
PARALLEL - monocots
NETTED - dicots
PINNATE
PALMATE

10. ANATOMY of LEAVES
EPIDERMIS
Cuticle
Trichomes
Stomata
Guard Cells

11. ANATOMY of LEAVES

13. LEAF ABSCISSION
LEAF DROP in DECIDUOUS plants

14. LEAF ABSCISSION

15. LEAF MODIFICATIONS
SUPPORT
Thick Petioles
Captured Gas

16. LEAF MODIFICATIONS
WATER STORAGE
Succulents

17. LEAF MODIFICATIONS FOOD STORAGE Thick leaves (below)
Scales on Bulbs (right)
Thick leaves (below)

18. LEAF MODIFICATIONS
CLIMBING
Tendrils (right)
Leaf petioles (below)

19. LEAF MODIFICATIONS
PROTECTION
Spines (right)
Bracts (below)

20. LEAF MODIFICATIONS INGESTION Carnivorous plants Venus Fly Trap (above)
Sundew (left)
INGESTION
Carnivorous plants