1. Lab Report - Density and Composition
The movements of stentors depend highly on the temperature of the surrounding environment. Stentors are single celled protozoan found in slow moving fresh water (Stentor, 2015). They belong to the class spirotrichea in the phylum Ciliophora (Hickman, 2013). Stentors move and feed by the locomotion caused by cilia (Hickman, 2013). They are ectothermic, which means that the environment temperature determines their body temperature (Stentor, 2015). Our objective for this lab was to study the rate of movement of stentor in contrast with different water temperatures. Therefore, stentor was tested in 5° C water and 20° C water in order to study the effects temperature has on their movement. We hypothesized that by increasing the temperature of the surrounding environment, the speed of stentor will increase as well because an increase in heat is directly related to an increase in energy.
Materials and Methods .
To begin the lab we obtained a gridded depression slide and applied Vaseline outlining the grid. The professor then added the Stentor and water mixture to the slide where finally the coverslip was applied. Then using ice, we prepare and controlled the water in the bowls to the correct temperature. The slide was then set in a 5° C bowl of water followed by a 20° C bowl of water. Stentor was finally observed and studied under the dissecting microscope. Each time stentor would cross a millimeter mark, it would be counted and added to the data. The number of lines crossed was counted in one minute for each temperature for three separate trials. The results were gathered, analyzed, and plotted on bar graphs along with charted T-tests. For each graph the mean, range, and standard deviation were calculated and for every T-test the probability was calculated.
Results .
The analyzed data suggests that an increase in temperature of the environment causes an increase in movement of stentors.
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