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Week One Notes

by: Sarah Figueroa
Sarah Figueroa


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Calculus for Business Administration and Social Sciences
Class Notes
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This 2 page Class Notes was uploaded by Sarah Figueroa on Saturday August 27, 2016. The Class Notes belongs to MATH 122 at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months taught by in Fall 2016. Since its upload, it has received 4 views. For similar materials see Calculus for Business Administration and Social Sciences in Math at 1 MDSS-SGSLM-Langley AFB Advanced Education in General Dentistry 12 Months.


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Date Created: 08/27/16
Sarah Figueroa  March 1, 2014 Goldmann      Lab Report Transpiration Rate  Transpiration is water evaporation from the leaves of a plant through its stomata.  Darkness, less water outside and higher temperatures have been known to decrease  transpiration by the closing of the stomata. While light, an abundance of water outside  and optimum temperatures have been known to increase transpiration. What controls the  actual opening and closing of the stomata is its guard cells. These are what respond to  environmental stimuli. This experiment is designed to examine the effects of  environmental factors and abscisic acid on transpiration rates in leaves. Abscisic Acid  (ABA) is mostly known to play an inhibitory role; it causes the guard cells of the stomata to close. For this experiment my hypothesis was that an increase in light would cause a  lot more transpiration to occur over an 80­minute period, while wind darkness and ABA  won’t have as high of a transpiration rate change.  The plant species used in this experiment was Geranium (Pelargonium hortorum)  leaves with the petiole intact. Four plastic tubes were obtained and one plant was placed  in each. One tube contained 100M of ABA and the others just had distilled water. Each  tube is weighed at the start. The ABA and light tube were placed in bright light. The dark  tube was placed in a drawer and the wind tube was placed in front of a fan. A  measurement of each tube’s weight was measured every 20 minutes for 80 minutes. After each weigh in the tubes were placed back in their appropriate spots. This was to  determine how much transpiration was taking place in the 20­minute intervals.  The wind and light treatments showed a considerably larger decrease in weight  over time compared to the dark and ABA treatments. This accounts for the loss of water.  There was approximately no more than a 100­200mg change for the dark and ABA  treatments while there was more than a 200mg change in the light and wind treatments.  The results are shown below. Table 1. Loss of water from leaved treated by wind, dark, or abscisic acid. Time (Min) Light Dark  Wind ABA 0 4887mg 4868mg 4960mg 4946mg 20 4862mg 4850mg 4931mg 4927mg 40 4798mg 4834mg 4816mg 4901mg 60 4733mg 4819mg 4686mg 4886mg 80 4660mg 4791mg 4550mg 4864mg Table 2. Transpiration Rate Averages Interval  Light(mgH2O/min) Dark(mgH2O/min) Wind(mgH2O/min ABA(mgH2O/min (Min) ) ) 0­20  1.25 .9 1.45 .95 21­40 3.2 .8 5.75 1.3 41­60 3.25 .75 6.5 .75 61­80 3.65 1.4 6.8 1.1 Average 2.84 .99 5.13 4.1 My original hypothesis was that an increase in light would cause a lot more  transpiration to occur over an 80­minute period, while wind darkness and ABA won’t  have as high of a transpiration rate. Although the increase of transpiration with light  hypothesis was correct it lacks the idea that wind would have a much greater impact than  light. The bright light aided in more evaporation and the increase of the transpiration rate  from the wind treatment accounts for the removal of water vapor allowing for more  evaporation to take place. Abscisic acid is supposed to play a role in closing the guard  cells but my experiment didn’t support this because there was a high transpiration rate,  close to the transpiration rate of the wind treatment. This is a question that will probably  need to answered with another experiment maybe having many plants with the ABA and  then maybe put in light, dark and wind conditions.  Work Cited: The Editors of Encylopaedia Bitannica. Addicott, F. T., Lyon, J. L., Ohkuma, K., Thiessen, W. E., Carns, H. R., Smith, O. E.,  Cornforth, J. W., Milborrow, B. V., Ryback, G., and Wareing, P. F. (1968). "Abscisic  acid: A new name for abscisin II (dormin)". Science 159:1493. http://www.plant­ Richard Klotz. 2014. Transport of Water in the Xylem. Biology 201. SUNY Cortland.


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