Ball up or Ball out - Ball up or Ball out The effect of...

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Ball up or Ball out The effect of Temperature Change on Planaria April Hobbs 10/21/09 GLA: Jonathan Pahlas Tuesday 12:20 Abstract This experiment has been carried out as an effort to analyze and make conclusions about Planaria’s response to various temperature changes. All organisms are faced with
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an assortment of environmental disturbances that can affect their survival within their habitat. Temperature happens to be one of the disturbances that organisms are faced with. This experiment will allow us to understand the nature of the organism itself, and understand the complexity of their biological make-up in relation to protecting themselves from extreme temperature changes. We conducted this experiment by exposing the worms to different temperature ranges and observing their reactions. We used ice to cool the water and a hot plate to warm the water. An electronic thermometer was placed in the water to record exact temperatures. Through our experimentation, we were able to find that planaria tend to ball up more constantly as the temperature gets further away from the normal environments temperature. They also tend to stay balled up for longer periods of time as the temperature change increases. These findings allowed us to conclude that planaria have the ability to sense temperature changes, and their reactions (balling up/contracting) increase as the temperature change increases. Introduction The environment in which planaria thrive in is always changing. Therefore, they must be able to adapt to changes within the environment in order to survive. A major environmental change that most all organisms are faced with is temperature change. Temperature changes can be influenced by many things such as changes in the weather from day to day and especially seasonal changes. Previously, while handling Planaria in lab, we noticed that the Planaria would ball up when its petri dish was slightly moved. This observation allowed us to speculate whether Planaria ’s nervous system will react the same way (ball up) under temperature changes. This balling up mechanism that the Planaria possess can help prevent heat loss in a cold environment. There have been many contemporary experiments carried out that focus on the adaptations Planaria possess under specific environmental conditions. One study that was done, dropped a droplet of water on a Planaria , and observed the Planaria ’s reaction. The Planaria in this experiment contracted and balled up when exposed to a
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This note was uploaded on 07/19/2010 for the course BIOLOGY NA taught by Professor G during the Spring '10 term at University of Georgia Athens.

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Ball up or Ball out - Ball up or Ball out The effect of...

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