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Why did you need to calculate leaf surface area to determine the rate(s) of transpiration?9. What structural or physiological adaptations enable plants to control water loss? How might each adaptation affect transpiration?
10. Make a prediction about the number of stomata in a leaf and the rate of transpiration. What type(s) of experiments could you conduct to determine the relationship between the number of stomata and the rate of transpiration?11. Create a diagram with annotation to explainhow the TACT (transpiration, adhesion, cohesion, tension) mechanism enables water and nutrients to travel up a 100-ft. tree. Predict how a significant increase in ambient (environmental) temperature might affect the rate of transpiration in this tree. Explainyour prediction in terms of TACT and the role of guard cells in regulating the opening and closing of stomata.■■Evaluating Results1. Was your initial hypothesis about the effect of your environmental variable on the rate of transpiration supported by the data you collected? Why or why not?2. What were some challenges you had in performing your experiment? Did you make any incorrect assumptions about the effect of environmental variables on the rate(s) of transpiration?3. Were you able to perform without difficulty the mathematical routines required to analyze your data? Which calculations, if any, were challenging or required help from your classmates or Mr. Schuster?■■Where Can You Go from Here?1. Investigate how guard cells control the opening and closing of stomata, including the role of abscisic acid and K+.2. Design an experiment to investigate transpiration in two different types of plants — one that is drought tolerant and one that requires a significant amount of water. What predictions can you make about the rate of transpiration in each?3. If you had to revise the design of your experiment, what suggestions would you make? Why would you make them?4. If your investigations generated other questions that you might want to research, ask Mr. Schuster if you can conduct other experiments. You know you want to.