Bio Lab 1-2 Answers

Lab 1, Exercise 1 • Based on the information in Table 2, what patterns do you observe? The number of fish that I observed in a body of water increases until the dissolved oxygen was at 12 ppm. After that point, the number of fish declines slightly. • 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. When the dissolved oxygen levels increase, the number of fish that I observed will also increase until you reach 12 ppm. • What would your experimental approach be to test this hypothesis? A few of the ways that I approached this question. Some options could include: Set up a large aquarium with an oxygen source on one end. Measure the dissolved oxygen (DO) at regular intervals in the aquarium. Release fish into the tank and observe which areas they spend the most time in. Set up multiple small pools with swim ladders between them. Aerate each pool at a different level to create differing DO levels. Release an equal number of fish in each pool and watch to see if they congregate more often in some pools over others. What are the independent and dependent variables?
Independent Variables: DO content in ppm
Dependent Variables: the fish observed • What would be your control? Set up an aquarium of the same shape and size where the DO level at a specific level is consistent throughout. If DO is not important, than the fish will be found throughout the tank instead of spending most of their time in one part of the tank. Set up multiple pools with the swim ladders between them. Aerate each pool the same such that the DO levels are consistent between them. Release the fish and note their distribution. What type of graph would be appropriate for this data set? Why?
A line graph would most appropriate for the data in the table. • Graph the data from the table above.

• Interpret the data from