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Planarian Worm Lab

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For this experiment, we studied how planarian worms would grow after being segmented. To begin this experiment, we filled up petri dishes half-way with spring water, this is so the planarian worms would not dehydrate and die during the two weeks we were observing them. Next, the planarian worm was picked up from its container with a pipette and then placed in a separate petri dish with some water. This took some time and I ended up having to use a pick to get the planarian worm off the inside walls of the pipette. Once the worm was in the petri dish, a razor was used to cut the worm in half, creating a “head” and “tail” segment of the worm. Since my worm was of a larger size, I did not feel the need to place it under a microscope and cut it …show more content…

I hypothesized this because I believed I cut the worm into two fairly even pieces and they had the same amount of time to grow. For the “head” segment, the initial measurement was five millimeters, and from the very beginning, I noticed that this segment was a lot more active and moved around more than its counterpart. For the first week’s measurement, the worm segment stayed the same at five millimeters, but I noticed that a tail was starting to form on the “head” segment and the segment still remained very active. The second week’s measurements was a six millimeter “head” segment, a one millimeter growth throughout the whole experiment. The tail had almost fully formed itself for the “head” segment and there was still a lot of mobility. The “tail” segment measured initially at six millimeters and showed little signs of movement. Throughout the two week observation period, the “tail” segment did not grow at all and showed very few signs of vitality, but by the second week, a new head had started to form on the “tail” segment. Comparing the results of the experiment to my initial hypothesis, I was incorrect, the “head” segment grew more than the “tail” segment, although not by much. There could have been some error with the measurements because the tail segment did not really move at all and tended to shrink up

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