Bio Lab 101

Dissolved Oxygen 0 2 4 6 8 10 12 14 16 18

Number of Fish Observed 0 1 3 10 12 13 15 10 12 13

1. Based on the information in Table 2, (in the lab manual) what patterns do you observe?

The dissolved Oxygen has a constant increasing rate of 2 ppm. While the number of fish observed does not have a precise pattern besides 10-13 were repeated twice in the whole table.

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 the number of Dissolved oxygen increases then the number of fish observed increases as well.

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

To test the hypothesis you must first test out the increase in number of fish as it with the quantity of the dissolved oxygen. Also see if the experiment is repeatable and is accurate each time the experiment is conducted.

4. What are the independent and dependent variables?

The dependent variable is the number of fish observed. The independent variable is the dissolved oxygen.

5. What would be your control?

The control could be the water temperature.

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

7. Graph the data from above

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

The graph above shows the fish population on the Y (axis) and the dissolved oxygen on the X (axis). The fish population increases in the above graph due to more dissolved oxygen that is found in the body of water. For example: There is 0 dissolved oxygen (ppm) in the water, so there is 0 fish observed.

Exercise 2:

Determine which of the following observations are testable. For those that are testable:

o Write a hypothesis and null hypothesis

o What would be your experimental approach?

o What are the dependent and independent variables?

o What is your control?

o How will you collect your data?

o How will you present your data (charts, graphs, types)?

o...