Scin 130 Lab 3 Worksheet: Plant Transpiration

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Lab 3 Worksheet: Plant Transpiration

Student instructions: Follow the step-by-step instructions for this exercise found on the worksheet below and in the virtual lab and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus.

Please make sure that your answers are typed in RED.

Please type your Name and Student ID Number here:


1.Open the Virtual Lab titled “Plant Transpiration.”
2.Read the background information found under the “Question” area first, and then read the procedure information posted there as well.

3.Click on the “Information” button in the laboratory area and read through the information presented.

4.If you come upon terms that are unfamiliar to you, please refer to your textbook for further explanation or search the word here:

5.At this point, you are ready to begin the lab exercise. Click on one of the plant specimens and drag it to the potometer as directed in order to begin the activity.

6. Complete the exercise as directed, recording any data or information collected in Table I below. Record all data in Table 1 to the 1st (tenths) decimal place.

7.When you are finished, please answer all of the Lab Questions below.


1. Again, please make sure you have read through all of the information in the “Question” and “Information” areas.

2. In this exercise, you will test the effects of various environmental conditions on the rate of plant transpiration. To begin, click on one of the plant specimens and drag it to the potometer; the name of the plant will then appear.

3. Click on the clock icon to begin the experiment.

4. After the simulated hour has passed, you will be shown the temperature at which the experiment took place and the volume of fluid transpired by the plant (in mL). Place all of this information in Table I below.

5. Now that you have assessed the transpiration rate of this plant under normal conditions, click and drag one of the three appliances to the laboratory bench next to the potometer. .

6. Click the clock to begin the second experiment. After collecting your data as above, repeat these procedures on your plant specimen using the remaining two appliances.

7. When you are completely finished testing your specimen under all four conditions, click on a new plant specimen and drag it to the potometer. Following all of the procedures above, collect your data on the transpiration rates of this plant and place them in Table I below. When you have completely analyzed all four visible plant specimens, you can click the “Reset” button to obtain new plant specimens. There are 9 total plants in all that need to be tested under all four environmental conditions.

8. Answer Lab Questions 1-18 below.

Table I: Total Amount of Water (mL) Transpired in One Hour
Plant TypeNormal Conditions (@21oC)With Heater
(@27oC)With Fan (@21oC)With Lamp (@21oC)
Arrowhead3.6 ml6.6 ml7.5 ml4.0 ml
Coleus0.9 ml3.9 ml6.0 ml3.0 ml
Devil’s Ivy2.9 ml4.1 ml4.6 ml3.0 ml
Dieffenbachia4.1 ml6.0 ml7.7 ml3.9 ml
English Ivy1.8 ml3.2 ml5.1 ml2.1 ml
Geranium1.2 ml5.8 ml4.7 ml2.4 ml
Rubber Plant4.9 ml6.8 ml8.4 ml4.3 ml
Weeping Plant3.3 ml4.9 ml6.1 ml2.5 ml
Zebra Plant4.2 ml6.1 ml7.6 ml3.2 ml

Lab Questions:

1. Transpiration in plants is driven by which of the following? a.Gravity
b.Capillary action
c.Static electricity
d.All of the above

2.Which of the following statements about stomata is true?
a.They are found on plant roots.
b.They permit the intake of carbon dioxide.
c. They permit the intake of oxygen.
d. All of the above.

3.Water can be lost by a plant through which process(es)?
d.A and B

4. Which environmental condition in your experiments...
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