Biol 102 103

Exercise 1: Data Interpretation

Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many 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 measured in units of ppm (parts per million). Examine the data in Table 4 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.

Post-Lab Questions

1. What patterns do you observe based on the information in Table 4?

* The number of fish lives increase until a certain point then it decreases.

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 you increase the amount of dissolved oxygen then, more fish will eventually die

3. What would your experimental approach be to test this hypothesis?

* Make an observation

* Purpose a hypothesis

* Test the hypothesis with further observations

* Analyze data

* State conclusion about hypothesis based on data

4. What would be the independent and dependent variables?

* independent : dissolved oxygen

* dependent : number of fish

5. What would be your control?

* the number of fish observed

6. What type of graph would be appropriate for this data set? Why?

* line graph, because it will show you the increase of the fish then a dramatic decrease in the fish that actually survived

7. Graph the data from Table 4: Water Quality vs. Fish Population (found at the beginning of this exercise).

8. Interpret the data from the graph made in Question 7.

* The data in the line graph above show you how the fish whom survived increased then decreased after a period of time. It shows and proves that to mcuh dissolved oxygen isn’t healthy for fish...