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Lab Report: Bramble Leaf Morphology

5745 words - 23 pages

B. IMPLEMENTING
SUN SITE SHADE SITE

Thickness of bramble leaf/ mm
0.31
0.30
0.25
0.26
0.31

0.29
0.27
0.26
0.33
0.32

0.29
0.25
0.35
0.34
0.27
0.27
0.29
0.25
0.29
0.32
0.25
0.33
0.36
0.31
0.37
0.34
0.27
0.36
0.28
0.29
0.22
0.17
0.24
0.19
0.19
0.21
0.22
0.18
0.16
0.22
0.16
0.19
0.22
0.19
0.17
0.19
0.17
0.19
0.20
0.16
0.22
0.21
0.18
0.19
0.15
0.20
0.16
0.21
0.19
0.18
Mean bramble leaf thickness / mm
0.30
0.19

Light Intensity / mV
At 10:30
7.81

At 13:00
8.34
At 15:30
7.65
At 10:30
3.89
At 13:00
4.02
At 15:30
3.76
Mean light intensity/mV 7.93 3.89

Aspect of Site
South East

South East
Results

In order to investigate the effect of light intensity on bramble leaf morphology, it was decided that thickness would be the particular morphological feature that was going to be investigated. It was felt that the best possible use was made of the equipment and sites available in order to attain reliable data under the time constraints involved.
The sample size for this investigation was set at 30 – this allowed a reasonably large sample and thus reasonably confident conclusions and tests are possible for the Analysis and Evaluation sections. However, a sample size of 30 is still small enough in order to feasibly collect data within the allocated time period.
The two sites chosen were suitable in order for valid data to be collected and compared. The two sites were comprehensively distinct sun and shade sites. As can be seen on the photograph, the sun site had virtually no major branches or trees in its vicinity and thus a lot of light was able to shine on the leaves. In contrast, the shade site was surrounded and shadowed by many branches of trees and hence the leaves were in the shade for the majority of the time. A preliminary light intensity reading of 7.74mA and 3.12mA for sun and shade sites respectively helped confirm this.

Additionally, the two sites shared similar aspect – although not completely identical, the fact that in the preliminary investigations, the compass showed south-east for both sites meant that they were suitable for use. The sites were both facing the sun in the same way. Also, both sites were opposite a large school building and hence both exposed to the same external surroundings.
Furthermore, both sites were likely to be similar in the soil pH and make-up. As the sun and shade sites were near each other, they were both next to the same trees. Thus, any leaves decomposing were likely to be similar as they would have been from these trees. Hence, the scope for variation of pH or soil make-up would have been minimal and thus will allow comparability between the results.
In addition, both the sun and shade sites were underneath same trees, such as sycamore trees. Hence, both sites had bramble leaves competing with the same species of tree. Hence, the presence of the sycamore tree would...

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