Transpiration Lab
- 1. Transpiration Lab Your final long lab report!
- 2. Transpiration is… The process by which plants lose water through stomata of leaves. As a result… Water moves up through plant stems in xylem due to the special properties of water
- 5. Cohesion
- 7. Adhesion
- 8. How do stomata control this important task? It’s really up to the guard cells!
- 9. When water is plentiful Guard cells are turgid, and stomata are open
- 11. When plants are stressed due to insufficient ground water…
- 12. Plants close stomata during certain conditions Bright sunny days Windy days
- 13. What do stomata do when the humidity is high? Great Question! Let’s conduct an experiment and see…
- 14. We are going to use a plant that is commonly planted in our area… Impatiens sp.
- 17. Impatiens sp . Are… Water loving plants that need water everyday in our hot NC summers A great experimental plant to test transpiration because of their high water consumption
- 18. You will need to write your own procedure for this lab, but in general, here is what we will be doing:
- 19. We will simulate 3 possible environmental conditions: A sunny day (using a bright light) 2. A windy day (using a fan) 3. A humid day (using a terrarium with a bowl of water)
- 20. What have we forgotten? The control! Our control will be room conditions with no variable applied
- 21. Include 2 graphs in your analysis Make a line graph of the % change in mass from Monday to Friday for the control and the 3 experimental variables. Also include the class average data. Make a bar graph for the overall % change in mass for the control and the 3 experimental variables. Include both your data and the class average data.
- 22. What about the hypothesis? Write your hypothesis (on your data sheet) with your lab partner before you start the experiment. Remember to relate the experimental variables to the control.
- 23. Get 4 Impatiens plants—1 control plant and 3 for the experimental variables. You may need to cut the packs apart Water your 4 plants. 3. Pinch off all flowers or flower buds, because they have mass, and mass is our dependent variable.
- 24. 4. Put a baggie around the root system (keep the plant in the plastic pot) and close with a twist tie. 5. Label each plant with your name and experimental variable. 6. Find the mass of each plant and record on your data table.
- 25. 7. Place each plant in the appropriate environment. 8. Find the mass of each plant, Tuesday-Friday. On Friday we will compile class data for your lab report. 9. Write your lab report which will be due Friday, May 1.