1. STOMATA ON LEAVES

2. CELL WALL
GUARD CELL
STOMA (PORE)
EPIDERMAL CELLS

4. STOMATA – STRUCTURE
Found on the lower (and sometimes upper) epidermis (surface) of leaves
Holes/pores in leaf
Singular – stoma, plural – stomata
Hole is surrounded by two guard cells
These can open by becoming turgid and close by becoming flaccid
Guard cells contain chloroplasts
Usually open during the day and closed at night

6. STOMATA – ROLES, FUNCTIONS
To control the entry and exit of gases into and out of the leaf
Guard cells open and close to control this
Stomata respond to outside conditions
When conditions are right for photosynthesis, stomata open wide for gas exchange
When it is too dry or dark, stomata close up.
Closed stomata prevent water loss in plant

7. TRANSPORT OF WATER AND FOOD
Vascular bundles/tissues
Contain xylem for transporting water UP from roots to leaves
Contain phloem for carrying food/nutrients like sugars and amino acids down from leaves to plant

8. Vascular Bundle
Xylem
Phloem

9. A vascular bundle in a stem

10. Your turn to find some! Use the celery stems to cut a VERY fine slice
View under microscope
Find a vascular bundle on low then med power
Xylem will be redish? Maybe?

11. WHAT YOU SHOULD TRY TO SEE
XYLEM
PHLOEM

13. DIDYMO ORGANISMS

14. Didymo algae cell

15. Unicellular organisms
They will be moving!

16. Paramecium