Transpiration Lab
Determine the % change in mass over the week and report these in a chart and graph. Be sure your graph has all of the appropriate titles and units.
Analysis Questions:
1. For this experiment, what were the independent variable and the dependent variable? What was the control? What were some constants in this lab?
2. Calculate the average rate of water loss per day for each of the treatments. (Humidity, Light, Fan, Dark, Room or control).
3. Explain why each of the conditions causes an increase or decrease in transpiration compared with the control.
4. How did each condition affect the gradient of water potential from the stem to leaf in the experimental plant?
5. What is the advantage to a plant of closed stomata when water is in short supply? What are the disadvantages?
6. Describe several adaptations that enable plants to reduce water loss from their leaves. Include both structural and physiological adaptations.
7. Why did you need to calculate the % water loss each day instead of graphing the total amount of water lost each day?
8. Draw a plant leaf cross section and label the following layers in this diagram; cuticle, upper epidermis, palisade layer (mesophyll), spongy layer (mesophyll), vascular bundle(s), lower epidermis, guard cells, and stomata.
9. State the function of each of the structures listed in question # 8.
10. How does the concept of hydrogen bonding relate to transpiration pull? Be specific in your explanation, using a drawing to assist your explanation.
Conclusion
Complete standard conclusion components, such as reject or not reject hypothesis, points of error, new questions, experimental design changes, real world application d connections to Big
Analysis Questions:
1. For this experiment, what were the independent variable and the dependent variable? What was the control? What were some constants in this lab?
2. Calculate the average rate of water loss per day for each of the treatments. (Humidity, Light, Fan, Dark, Room or control).
3. Explain why each of the conditions causes an increase or decrease in transpiration compared with the control.
4. How did each condition affect the gradient of water potential from the stem to leaf in the experimental plant?
5. What is the advantage to a plant of closed stomata when water is in short supply? What are the disadvantages?
6. Describe several adaptations that enable plants to reduce water loss from their leaves. Include both structural and physiological adaptations.
7. Why did you need to calculate the % water loss each day instead of graphing the total amount of water lost each day?
8. Draw a plant leaf cross section and label the following layers in this diagram; cuticle, upper epidermis, palisade layer (mesophyll), spongy layer (mesophyll), vascular bundle(s), lower epidermis, guard cells, and stomata.
9. State the function of each of the structures listed in question # 8.
10. How does the concept of hydrogen bonding relate to transpiration pull? Be specific in your explanation, using a drawing to assist your explanation.
Conclusion
Complete standard conclusion components, such as reject or not reject hypothesis, points of error, new questions, experimental design changes, real world application d connections to Big