Cyclosis versus light
Abstract The purpose of this investigation is to determine if a decrease in light affect the time of cyclosis. An Elodea leaf cells were subjected to 6 different intensities of light. The time it took one cytoplasm to move around a certain distance was measured after each change in the amount of light. It took 23s when the light intensity was on 5, the same time it took for the cytoplasm to move the same distance when light intensity was on 8. Leaving the conclusion that might be no connection between light and time of cyclosis. Cyclosis is the circulation of cytoplasm within a cell and this movement may be increased by light. (Columbia Encyclopedia) As the cytoplasm moves around the large central vacuole, it carries with it dissolved substances as suspended organelles. (Bedford 9) Chloroplasts are organelles responsible for photosynthesis in plant. Examples of cells in which cyclosis can be seen are the leaf cells of small aquatic plants, such as Elodea leaf. By timing the movement of a single chloroplast in a certain given distance with different intensities of light it is possib
As observed there was an increase in time from light intensity on 3 to 4, and a sudden decrease in time from time 4 to 5. Then when light amount given was 4 the time taken by the chloroplast was 34 seconds. So that the lab could be done easier a group of 4 people was formed. ResultsThe time taken by the chloroplast to travel the path observed on different light intensities are shown in the graph below. Materials and MethodsMaterials required for this experiment MicroscopeElodea LeafWater A drop of water was placed in the center of a clean microscope slide. Therefore no pattern indicates the relationship between light and the time (speed) of cyclosis. The observer chose a starting and a finishing point to the chloroplast so he could measure the time taken by the chloroplast to travel that specific path he chose. So to find out if light interferes in cyclosis one chloroplast is going to be observed and timed as it moves around within the cell. First the chosen chloroplast was observed with light intensity on 3 then its time was taken. When light intensity was on 3 it took 30 seconds for the chloroplast to travel its chosen path. Therefore on the basis of the results of this study, the hypothesis presented above can be neither accepted nor rejected. On 7 was 23 seconds and 8 was 23 seconds again. Then the same steps were taken with light intensity on 5, 6, 7 and 8. One person was responsible for observing the Elodea leaf in the microscope.
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,
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Acceptance Essays
