The Effect Of Sun And Shade On Stomatal Density On White Oak, Quercus Alba

1772 WordsSep 29, 20168 Pages
The Effect of Sun and Shade on Stomatal Density on White Oak, Quercus alba, Leaves Kira Pointon Abstract Environmental factors have an effect on plant morphology. The amount of sunlight a leaf is exposed to affects its number of stomata, openings that allow for gas exchange and water flow. In this survey, we observed ten leaves taken from a white oak, Quercus alba, tree in the sunlight, which we called the light treatment, and ten leaves taken from another Q. alba tree in the shade, which we called the dark treatment, to compare their stomatal density. Leaf impressions were taken using nail polish and tape to imprint the stomata on the underside of the leaf. This imprint was used to calculate the stomatal density by counting the number of stomata in a representative area. To compare the results of our two treatments, light and dark, a t-test was used to find a significant difference. Significant differences were found in Q. alba when comparing light variations. Introduction Plants are an important part of nature. They act as a food source for many animals and recycle the air around them. Organisms with traits that give them a higher fitness relative to others will be able to better survive and reproduce. Because of this, that organism’s desirable trait(s) will be passed on to the next generation. This is part of the process called natural selection. Over time, natural selection has led to plants evolving to have certain traits. Plants have developed an

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