1. Leaf Structures

2. Internal Structures
chloroplast
Cuticle [Green]- waxy layer on outer surface of leaf,
helps keep water inside leaf
Upper and Lower Epidermis [Red]- protect internal tissues from
water loss
Stoma [Orange]- openings in the lower epidermis that allow
carbon dioxide into and oxygen, water out of leaf
Guard Cell [Blue]- surround a stoma and open and close to regulate
the amount of water, oxygen, and carbon dioxide
present

3. Mesophyll- two layers located between upper and lower
chloroplast
Mesophyll- two layers located between upper and lower
epidermis, area where photosynthesis occurs
Palisade Cells [Yellow]- columns of cells containing chloroplasts
which are used to capture energy
from the sun
Spongy Layer- consists of randomly scattered cells
containing chloroplasts and air pockets
- important for the exchange of carbon dioxide
and oxygen

4. Vein- consists of xylem, phloem, and supporting tissue
Xylem [Pink]- carry water and minerals upward from roots
Phloem [Purple]- transports glucose out of leaf

5. External Features Blade- broad flat part of leaf Veins Blade Petiole
Petiole- the stem section of a leaf

6. Transpiration

9. Internal Leaf Structures