1. L10: 10.1

2. QUESTION:
How does water vapor escape a plant?

3. HYPOTHESIS:
I believe that water vapor …. because …..

4. PROCEDURE:
Page :
Focus the epidermis of a lettuce leaf on low power.
Locate a stomatal unit (it will look like a bright “eye” among the cells).
Draw a stomatal unit under medium or high power.
Label the stoma & guard cells.

5. DATA: Microscope drawing: Medium (100 X) or High (400 X)
Title: Stomatal Unit
Label:
Stoma
Guard Cell

6. DATA ANALYSIS: 1. What is the function of a stomatal unit?
2. The opening of the stomatal unit is called a ___.
3. What controls the opening & closing of a stoma?

7. 4. What substances enter or exit a plant’s leaves through the stomata?
5. Why do plants need water & carbon dioxide?
6. Why do plants need oxygen?

8. VOCABULARY:
Stoma (Stomata)
Guard Cells
Transpiration

9. CONCLUSION: Be sure to look back at the original question.
Be sure to use complete sentences.
Be sure to USE & HIGHLIGHT all vocabulary words.