L10: 10.1L10: 10.1

QUESTION:QUESTION: How does water vapor How does water vapor

escape a plant?escape a plant?

HYPOTHESIS:HYPOTHESIS: I believe that water vapor I believe that water vapor

…. because …..…. because …..

PROCEDURE:PROCEDURE: Page 122-123:Page 122-123: Focus the epidermis of a lettuce leaf Focus the epidermis of a lettuce leaf

on low power.on low power. Locate a stomatal unit (it will look Locate a stomatal unit (it will look

like a bright “eye” among the cells).like a bright “eye” among the cells). Draw a stomatal unit under medium Draw a stomatal unit under medium

or high power.or high power. Label the Label the stoma & guard cellsstoma & guard cells..

DATA:DATA: Microscope drawing:Microscope drawing: Medium (100 X) or High (400 Medium (100 X) or High (400

X)X) Title: Stomatal UnitTitle: Stomatal Unit Label:Label:

StomaStomaGuard CellGuard Cell

DATA ANALYSIS:DATA ANALYSIS: 1. What is the function of a 1. What is the function of a

stomatal unit?stomatal unit? 2. The opening of the 2. The opening of the

stomatal unit is called a ___.stomatal unit is called a ___. 3. What controls the opening 3. What controls the opening

& closing of a stoma?& closing of a stoma?

4. What substances enter or 4. What substances enter or exit a plant’s leaves through exit a plant’s leaves through the stomata?the stomata?

5. Why do plants need water 5. Why do plants need water & carbon dioxide?& carbon dioxide?

6. Why do plants need 6. Why do plants need oxygen?oxygen?

VOCABULARY:VOCABULARY: Stoma (Stomata)Stoma (Stomata) Guard CellsGuard Cells TranspirationTranspiration

CONCLUSION:CONCLUSION: Be sure to look back at the Be sure to look back at the

original question.original question. Be sure to use complete Be sure to use complete

sentences.sentences. Be sure to USE & HIGHLIGHT Be sure to USE & HIGHLIGHT

all vocabulary words.all vocabulary words.