Week 6 laboratory reflection - Plant Transpiration

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Indiana University, Bloomington *

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Biology

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Dec 6, 2023

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Name: Clayton Swartz Laboratory Reflection: Plant Transpiration (Part 1) Instructions: Make sure to scroll through the entire document to answer all questions. It would also help with grading if you put your typed answers in a different (but readable) color font . Save and upload your completed assignment to the associated assignment page on Canvas. It is the student’s responsibility to confirm that the correct file was submitted to Canvas by the due date. 1. (2pt) Based on what you have learned about plant transpiration, predict what might happen to the rate of transpiration if the number of leaves on a plant is reduced. What about if the number of stomata is reduced? Explain your reasoning. I think if there were less leaves then there would be less transpiration. The water has more surface area on leaves and therefore is absorbed into the ambient atmosphere easier. If there were fewer stomata, there would be more transpiration because the pores wouldn’t be regulated. 2. In this week’s laboratory, you set up an experiment testing the effect of an environmental factor on transpiration rates in corn. a. (1pt) Describe your group’s hypothesis and predictions. Provide an explanation of your predictions (i.e. specifically, why do you expect to see these results?) To help you answer this question, you may wish to do some additional background research regarding the environmental condition your group manipulated. We hypothesized that the difference in sunlight would make a difference and predicted that more sunlight would mean more transpiration. This is because the sun will stimulate the stomata and increase transpiration. b. (1pt) Why is it important to have more than one plant in each treatment? If one plant dies or doesn’t receive the right amount of sunlight, the others will balance its results out in the average. c. (2pt) Describe at least two factors in your experimental design that you controlled for. Why is it important to control for all factors except for the factor that you have manipulated? 1

We controlled for evaporation from the tube and temperature by covering the top and keeping them in the same room. This is to prevent other factors not accounted for from affecting our results, which could lead to faulty conclusions. d. (1pt) In your experiment, what is the purpose of placing the parafilm over the conical tube? To prevent uncontrolled evaporation and hold the plant in place. 3. (3pts) Create a graph of your predicted results and insert it below. This can be a picture of a hand-drawn graph or a computer-generated graph. Your graph should include a brief figure caption describing the figure and the experimental design used for the data presented. Make sure to label your axes! (Note: This will be good practice, as you will need to construct a graph of your actual results in next week’s post-lab reflection). My predictions Orange: No sun Blue: Sun X axis: Weight Y axis: sunlight 2 Note on figure captions: A complete figure contains both an image and a caption. Together, these two parts should provide enough information that a reader can understand the data presented without referring to the text. A figure caption should contain a concise description of the graphic allowing a reader to understand the figure.  The information contained within the caption should include a description of the graph (similar to a title), a brief statement of the methods necessary to understand the figure, statistical information, if applicable.  The caption should never begin with the words “Graph of…” or “Figure of…”  Example: Figure 1. Mean weight of golden-mantled ground squirrels was 150 g greater than that of thirteen- lined ground squirrels prior to hibernation. Although both species lost weight during hibernation, golden- mantled ground squirrels exhibited greater weight loss.

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