Plant Physiology Post-Lab Assignment Face-to-Face

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School

University of Texas, San Antonio *

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Course

1201

Subject

Biology

Date

Apr 3, 2024

Type

xlsx

Pages

7

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Biosciences II - Plant Physiology - Face-to-Face Riley Jacob Villas Lab Section: 20 Date: 3/7/2024 Group Members: Jennifer P, River B Complete all questions and tables on the three tabs following this Title page. Answers to questions must be written in complete sentences. Upload to Canvas by 11:59 P.M. by the due date. Name :
Transpiration Rates and Stomata Table 1. Transpiration Rates Control 18.7 12.9 23.2 Light 17.2 7.4 39.2 16 Fan 15.7 2.4 53.2 30 Question 1: Question 2: Question 3: Experimental Conditions Initial Meniscus Reading Final Meniscus Reading Transpiration Rate (Initial – Final) X 4 (mL/hour) Experimental Rate – Control Rate How did additional light and wind affect water transpiration for this plant? Other than light and wind, what other condition could have been tested to see if it affects the rate of transpiration for the plant? Explain your answer . With the addition of light and wind, water transpiration increased from the normal conditions. Another condition that could have been tested to see if it affects the rate of transpiration is darkness or no light. This is because it is said that plants need light for transpiration so testing the experiment in the dark could be done to compare the rate of transpiration to normal conditions. Do you think there is a quantitative relationship between transpiration rate and number or size of leaves on the stem? Explain your answer . I think there is a relationship between transpiration rate and number or size of leaves on the stem because the more leaves or bigger leaves means the plant will have more stomata. When a plant has more stomata, transpiration can occur at a higher rate. Do you think different plant species will have the same rate of transpiration on a per leaf area basis? Explain you answer . No I don’t think different plant species will have the same rate of transpiration on a per leaf area basis. I think this because different plants will have a different amount of stomata on their leaves due to different environments they live in.
Question 4: Question 5: Thoroughly describe the physical forces of evaporation , capillary action , adhesion , and cohesion as they relate to transpiration. The evaporation of water from the leaves make the cell walls in the leaf to dry out, making the water need to pull more water up. Water is pulled up by capillary action, which includes both adhesion and cohesion. Cohesion is the attraction between water molecules. Adhesion is the attraction of unlike molecules. Both combine during capillary action, which is the tendency of water to rise in a thin tube. How do the patterns of stomata differ in monocots and dicots? Provide at least two differences between monocots and dicots. The stomata found in dicots are randomly irregularly sorted, while the stomata found in monocots are regularly sorted in columns/rows. Also, the guard cells surrounding the stomata are dumbell-shaped in monocots, while dicots have bean-shaped guard cells.
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