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Transpiration Report

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Transpiration Report
Abstract: The object of this experiment was to study how different environmental conditions affected the rate of transpiration of a plant. The environmental factors we looked at were the affects of various temperatures and different light amounts in the different temperatures. We found that as the temperature warmed up, the rate of transpiration was higher. When the temperature was at five degrees Celsius, the rate of transpiration was very low. When we took out half of the light source and measured the rate of transpiration in the three temperatures we found the same variability of results as earlier where the cold temperature transpired less than the hot temperature but, with less light the overall transpiration rate was less all together.
Introduction:
In this experiment we demonstrated how transpiration works. We took branches from the same plant and measured the transpiration rate of each branch in different environmental conditions. The conditions that we looked at included different temperatures and the amount of light. When we started the experiment we believed that the hot environment would have a higher transpiration rate than the rest of the environments because the heat would speed up the evaporation of water vapor. We also believed that by taking out half of the light it would decrease the rate of transpiration but not much because the temperature plays a vital role in transpiration rates. We also thought that when the temperature was at a moderate temperature, the plant would still transpire just not as much as the hot environment. Also, when the plant was at a cold temperature we thought that it would transpire very little. We thought the same results for the decreased light but, we thought that the overall transpiration rate would decrease all together but still keep the low and high variability with the different temperatures. The loss of water through evaporation from the plant surface is called transpiration (Brooker, 2008).



Cited: Brooker, R. 2008. Biology. McGraw-Hill Companies, Inc. 4 pp. Clum, H. H. 1926. The Effect of Transpiration and Environmental Factors on Leaf Temperatures. American Journal of Botany, Vol. 13. No. 3. 194-216. Reddy, V. R. 1995. Carbon Dioxide enrichment and temperature effects on cotton canopy photosynthesis, transpiration, and water-use efficiency. Field Crops Research, Vol. 41. Issue 1. 13-23. Tahiri, A. Z. 2006. Fixed and variable light extinction coefficients for estimating plant transpiration and soil evaporation under irrigated maize. Agricultural Water Mangaement, Vol.84. Issue 1-2. 186-192. Wheeler, T. D. 2008. The Transpiration of Water at Negative Pressures in a Synthetic Tree. Nature, Vol. 455.7210. No. 5. 208-209.

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