AP Biology Dissolved Oxygen Lab Name: ______________________________ Watch the Bozeman Biology Dissolved Oxygen Lab Video. Google it or use one of the links below: http://www.bozemanscience.com/ap-bio-lab-12-dissolved-oxygen https://www.youtube.com/watch?v=XEcBQurjUQ4 1. Explain the lab procedure in your own words. 2. What does the lab tell us about dissolved oxygen? Next, go to the Pearson Classic Biology Lab Bench and find the Dissolved Oxygen lab. Or follow this link: http://www.phschool.com/science/biology_place/labbench/lab12/intro.html 1. Answer: Why did the fish in the aquarium die? 2. How is oxygen concentration in water affected by: a. temperature b. photosynthetic activity c. decomposition activity d. mixing and turbulence e. salinity 3. Which environment has the greater concentration of dissolved oxygen: salt or fresh water? 4. Which environment has the greater concentration of dissolved oxygen: warm or cool water? 5. Which environment has the greater concentration of dissolved oxygen: a clear pond or a pond with lots of algae? 6. Compare and contrast net and gross productivity. 7. What are the 3 ways to measure primary productivity? Which way does this lab measure? AP Biology Dissolved Oxygen Lab Name: ______________________________ 8. What is the percent oxygen saturation for a water sample at 10°C that has 7 mg O2/l? 9. What is the percent oxygen saturation for a water sample at 25°C that has 7 mg O2/l? 10. Explain the lab procedure in your own words. Complete the lab quiz online and record yours answers below. 11. In which aquatic environment would you expect dissolved oxygen to be highest? 12. Below is the correct graph of the data you were given in the Sample Problem. Study this graph to answer the following question: At what light intensity do you expect there to be no net productivity? 13. What is meant by "net productivity" and how is it calculated in a sample aquatic environment? 14. A biology class used two aquatic cultures as described below for the experiment with screens that reduce light. They measured dissolved oxygen initially, and then after 24 hours. What results would you predict for this experiment?