Lab Report- Pillbug.

Topics: Light, Woodlouse, Darkness Pages: 3 (711 words) Published: April 17, 2012
The Pillbug

Pillbugs, those sly little crustaceans, fit in a larger category called arthropods. In case you didn’t know arthropods have exoskeletons. Living under darker places, munching on decayed wood and leaves you’ll discover that they are usually between 5-15 millimeters long. What makes up this length are their three body segments. The names of the three body segments that pillbugs are made up of are called head, thorax, and abdomen. As you see in the picture, they have seven pairs of jointed legs! Keep looking at diagram 1 for more information about the pillbug body. Pillbugs are not only known as a pillbug, they have a few other names such as woodlice, sowbugs and a less scientific name that you might hear people refer them to is roly-poly.

Diagram 1
Based on the knowledge about the habitat and environment of the pillbug species does bright light affect the movement of the pillbugs? In the following experiment bright light and darkness movements we’re timed to see how much it differentiated. The hypothesis come up for this experiment was if bright light is related to pillbugs movement then pillbugs move slower in bright light. For this procedure the independent variable is bright light because that is what we want to test, and dependent variable is movement… get ready to see results!

The experiment was completed by using the materials and steps below… Materials
* 3 biology textbooks
* Flashlight
* Stopwatch
* 5 pillbugs

Step 1- Align 2 textbooks parallel [vertically] with 1inch in between. Step 2- Place the remaining textbook on top in the middle of the first 2 textbooks, covering the crack… so it’s dark. Step 3- Place pillbug #1 between the books’ opening at the beginning. Give them a little push to get them started and start the timer. Once headed in the right direction, place a hand or an object over the entrance. By doing that, you assure that the pillbug will stay headed in the right direction towards the finish. Step...
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