1. Bell Ringer: 3/16
Turn in the Celery Lab and the Critical Reading homework.
Grab your beans, and make your Day 4 observations.

3. Record your Bean Lab observation for “Day 4” of your data. 5 minutes

4. Leaf Anatomy

5. Leaves are not the same
Why?

6. Parts of a Leaf
Vein
Base
Petiole
Apex
Blade
Margin

7. Photosynthesis
Reactants:
Products:
6CO2 + 6H2O + Light
6O2 + C6H12O6

8. Cross Section of a Leaf
A. Waxy cuticle
A. Waxy cuticle

9. A. Waxy Cuticle
Waxy Cuticle – waxy outermost layer of leaf, covers epidermis
Function – water repelling, helps keep leaf from drying out, protection

10. Cross Section of a Leaf
B. Epidermis
B. Epidermis

11. B. Epidermis Epidermis – plant skin
Function – protective boundary between plant and environment

12. Cross Section of a Leaf
C. Vein (vascular bundle)

13. C. Vein (vascular bundle)
Vein – vascular bundle of xylem and phloem
Function – transport of water/ minerals and sugar/nutrients throughout plant

14. Cross Section of a Leaf
D. Stoma (stomata)

15. D. Stoma (plural stomata)
Stoma – gas pore on plant leaf, majority found on underside (few on top)
Function – water vapor and other gases leave and enter plant through this opening, regulates water loss

16. Cross Section of a Leaf
E. Guard cells
Air space
E. Guard cells

17. E. Guard Cells Guard cell – surround stoma
Function – allow stoma to open and close

18. Cross Section of a Leaf Mesophyll F. Palisade mesophyll
(photosynthetic cells, makes up majority of leaves)

19. F. Palisade Mesophyll
Palisade Mesophyll – elongated cells beneath epidermis
Function – contain most of chlorophyll, convert light to chemical energy plant can use

20. Cross Section of a Leaf Mesophyll G. Spongy mesophyll
(photosynthetic cells, makes up majority of leaves)
G. Spongy mesophyll

21. G. Spongy Mesophyll
Spongy Mesophyll – layer beneath palisade mesophyll
Function – contain some chlorophyll, communicate with guard cells to tell them to open or close stomata

22. Cross Section of a Leaf

23. Let’s look at stomata!

24. The majority of stomata are found on the underside of a leaf…

25. View under the microscope

26. Draw a picture of what you see in the microscope in your notebook and answer these questions.
Are the stomata open or closed?
Label the stoma (opening) and guard cells.
What type of mesophyll controls the opening and closing of the stoma?