Water and Line Graph
Exercise 1:
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
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
1. Based on the information in Table 2, what patterns do you observe?
Based on the information in Table 2, the patterns that I observe is that wherever there are fish, there is dissolved oxygen. The more fish there are, the more dissolved oxygen there is. Since fish are living organisms that need oxygen to survive, there is always going to dissolved oxygen in the water when fish are present.
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.
A hypothesis that relates to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water is the more fish that are present, the more dissolved oxygen will be present.
3. What would your experimental approach be to test this hypothesis?
My experimental approach to test this hypothesis would be to measure how much dissolved oxygen is found in the water when no fish is present. Then, measure the water with fish in it, increasing by 2 every time. Record the amount of fish and dissolved oxygen in a chart. When about 20 fish is reached, stop recording and put all the data into a line graph. Using a line graph will help see any patterns between dissolved oxygen and number of fish.
4.
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
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
1. Based on the information in Table 2, what patterns do you observe?
Based on the information in Table 2, the patterns that I observe is that wherever there are fish, there is dissolved oxygen. The more fish there are, the more dissolved oxygen there is. Since fish are living organisms that need oxygen to survive, there is always going to dissolved oxygen in the water when fish are present.
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.
A hypothesis that relates to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water is the more fish that are present, the more dissolved oxygen will be present.
3. What would your experimental approach be to test this hypothesis?
My experimental approach to test this hypothesis would be to measure how much dissolved oxygen is found in the water when no fish is present. Then, measure the water with fish in it, increasing by 2 every time. Record the amount of fish and dissolved oxygen in a chart. When about 20 fish is reached, stop recording and put all the data into a line graph. Using a line graph will help see any patterns between dissolved oxygen and number of fish.
4.