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L10: 10.1 Leaf Cell Stomata QUESTION: How does water vapor escape a plant? HYPOTHESIS: I believe that water vapor escapes a plant by …. because ….. PROCEDURE: Page 122-123 DATA: Microscope drawing: High (300 X) Title: Stomatal Unit Label: Stoma Guard Cell Nucleus DATA ANALYSIS: 1. Most dicot leaves have their stomata on the underside of their leaves. Why do you think Lemna have their stomata on their upper surfaces? 2. What evidence is there that the lettuce you observed is in fact a leaf? 3. What substances enter or exit a plant’s leaves through the stomata? 4. How do guard cells operate to form a stoma? VOCABULARY: Stomata Guard Cells Osmosis Semipermeable CONCLUSION: Be sure to look back at the original question. Be sure to use complete sentences. Be sure to USE & HIGHLIGHT all vocabulary words.