AP BiologyLab 12: Dissolved Oxygen and Aquatic Primary ProductivityPre-Lab Questions:

1. What is the biological importance of carbon and oxygen cycling in ecosystems?2. How does primary productivity relate to the metabolism of organisms in an

ecosystem?3. What are the physical and biological factors that affect the solubility of gasses in

aquatic ecosystems?4. What is the relationship between DO and photosynthesis and cell respiration and

their affect of primary productivity?

Question: What is the primary productivity of a lake or stream? What is the effect of changing light intensity or inorganic nutrients on primary productivity?

Hypothesis:

Dependent Variable:

Independent Variable:

Experiment Design:

Control Treatment:

Notes: