Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since virtually every living organism requires oxygen to survive, it is a necessary component of water systems such as streams, lakes and rivers in order to support aquatic life. The dissolved oxygen is measure in units of ppm—or parts per million. Examine the data in Table 2 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from; finally, answer the questions below. Table 2: Water quality vs. fish population ?? 1.
Based on the information in Table 2, what patterns do you observe? The more dissolved oxygen in the water, the more fish are observed in that area of water.
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2. Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water. If there is more dissolved oxygen in the water, there will be more fish are observed in the area of water. 3. What would your experimental approach be to test this hypothesis? To test the hypothesis I would do the same to get the results on the table.
Test the oxygen in different areas of the water and keep track of the amount of fish in the area to later compare the results. 4. What are the independent and dependent variables? Independent Variable- Dissolved Oxygen Dependent- Fish 5. What would be your control? In this experiment I don’t believe there would be a way to have a control since the fish would need to be able to move their own to conduct the experiment. 6. What type of graph would be appropriate for this data set? Why? I feel that a line graph would be the best type of graph to convey this information.
It would support the hypothesis along with showing the results in a very clear manner. 7. Graph the data from the table above. ? 8. Interpret the data from the graph made in Question 7. The graph shows that when the amount of Dissolved Oxygen increased the number of fish in the area increase and when the amount of oxygen decreases the amount of fish decrease. © 2010 eScience Labs, Inc. All Rights Reserved ? Dissolved Oxygen (ppm) 0 2 4 6 8 10 12 14 16 18 Number of Fish Observed 0 1 3 10 12 13 15 10 12 13