# An Analysis of the Sun and Shade Leaves of Burr Oak (Quercus Macrocarpa)

1499 Words Jun 6th, 2013 6 Pages
Alex Hinrichsen
BIOL 105: Tues. 3:00PM – 4:50PM
A Comparative Analysis of the Sun and Shade Leaves of Burr Oak (Quercus macrocarpa)
Abstract
This study was conducted to determine whether the leaf size of the burr oak (Quercus macrocarpa) is affected by the amount of solar radiation that the leaves receive. The outcome of the study indicated that the amount of solar radiation leaves obtain, does affect the size of the leaves. Results of the study verify that sun leaves are more likely to be larger in size than those leaves that are constantly in the shade.
Introduction
Many factors influence plant characteristics, one major factor is the intensity of solar radiation that a plant receives. Solar radiation can be observed by looking
Results
After converting the weight of each leaf to cm2 the group was able to form a table of values to calculate a mean area for both the sun and shade leaves. The group’s table of values is provided in Table 1. Table 1: Weight and Area of Sun and Shade Leaves | Shade Leaves | | Sun Leaves | | Weight (g) | Area (cm2) | | | Weight (g) | Area (cm2) | Shade 1 | 0.9 | 120.0 | | Sun 1 | 0.7 | 93.3 | Shade 2 | 1.0 | 133.3 | | Sun 2 | 0.3 | 40.0 | Shade 3 | 0.9 | 120.0 | | Sun 3 | 0.3 | 40.0 | Shade 4 | 0.8 | 106.7 | | Sun 4 | 0.5 | 66.6 | Mean Area | | 120.0 | | Mean Area | | 60.0 |

With the values listed in Table 1, the group was able to use statistics to test their hypothesis. Before being able to conclude their results, the group had to find the standard deviation for each set of leaves. The equation for calculating standard deviation is as follows: s=Σx-x2n-1 For this particular study the group used a statistical test that compares two different samples, known as a t-test. The following equation was used to calculate the t-value for the statistical test: t=(x1-x2)n1-1s12+n2+1s22n1+n2-2n1+n2n1n2 Given the above equation: t = t value x1= mean area of the shade leaves x2= mean area of the sun leaves n = sample size s = standard deviation df

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