# Relationship Between Woodlice and Speed

Topics: Hypothesis, Null hypothesis, Experiment Pages: 6 (732 words) Published: November 14, 2012
The relationship between the size of the woodlice and their speed

Abstract: How does the physical makeup and size of an organism relate to various activities an organism perform is a topic many people curious about. We wanted to find out if there was any relationship between the body size of woodlice and their speed. We hypothesized that the bigger woodlice have higher speed than smaller woodlice. We conducted an in-class experiment to test our hypothesis. We took ten woodlice and divided them into two groups: smaller and bigger woodlice. Each woodlouse was then let to run for 10 cm and time taken to reach the destination was recorded. Finally, when all woodlice completed running, we conducted a t-test. The value of ‘P’ from our test was 0.8956 which is larger than 5% level of significance. Since our value of P was larger than the 5% level of significance, we rejected our hypothesis and accepted the null hypothesis. The null hypothesis was that there is no relationship between the body size of woodlice and their speed. The findings from this experiment can be useful in determining and studying relationship between physical size and activities performed by many animals, Data:

Table-1: Experimental data (Weight and time) required for each woodlice Bug| weight of woodlice(gm)| time(s)|
1| 0.0284| 33.9|
2| 0.0284| 12.2|
3| 0.0277| 25.6|
4| 0.0272| 24.8|
5| 0.022| 13.1|
6| 0.0198| 28.5|
7| 0.0464| 24.8|
8| 0.0439| 13.1|
9| 0.0493| 28.2|
10| 0.0579| 17.7|

Weight of watch glass = 3.1163 grams
Weight of woodlice = weight of (woodlice+watch glass-watchglass)

Methods: The experiment to find relationship between body size and speed was conducted in our lab. 10 woodlice were used in the calculation. Each woodlouse was put on a small watch glass after the weight of watch glass was measured. After that, the weights of woodlice along with watch glass were measured. The average weight of all 10 woodlice was calculated. The woodlice were then divided into two groups: woodlice with more than average weight and woodlice with less than average weight. Woodlice from each group were allowed to run a distance of 10 cm. We simulated the run (of woodlice) by hand tapping next to woodlice. After all woodlice completed running, we calculated the average time taken and average speed for each group. A t-test was performed to test if our hypothesis was proved. Figures:

Table-2: Experimental data and findings
Bug
Weight of woodlice (g)
Time(s)
Speed (cm/s)
1
0.0284
33.9
0.294
2
0.0284
12.2
0.819
3
0.0277
25.6
0.390
4
0.0272
24.8
0.403
5
0.022
13.1
0.763
6
0.0198
28.5
0.351
7
0.0464
24.8
0.403
8
0.0439
13.1
0.763
9
0.0493
28.2
0.354
10
0.0579
17.7
0.564
Average
0.0351
22.2
0.511
SD
0.01241
7.23
0.200
Average for woodlice<0.0351
0.02558
23.0
0.503
Average for woodlice>0.0351
0.04937
20.9
0.521
T-test
0.896
Bug
Weight of woodlice (g)
Time(s)
Speed (cm/s)
1
0.0284
33.9
0.294
2
0.0284
12.2
0.819
3
0.0277
25.6
0.390
4
0.0272
24.8
0.403
5
0.022
13.1
0.763
6
0.0198
28.5
0.351
7
0.0464
24.8
0.403
8
0.0439
13.1
0.763
9
0.0493
28.2
0.354
10
0.0579
17.7
0.564
Average
0.0351
22.2
0.511
SD
0.01241
7.23
0.200
Average for woodlice<0.0351
0.02558
23.0
0.503
Average for woodlice>0.0351
0.04937
20.9
0.521
T-test
0.896

Graph-1: Comparison of the speed of woodlice

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