Lab NAME: 01 AP Environmental Science – Population Dynamics _________________________________ LAST DATE: _________ FIRST Can algae save the world? Goals: To use algae (Chlorella vulgaris) as a model organism to study about population growth. Each day you will collect a sample of algae from the class “bioreactor.” You will collect data as a class using a device called a spectrophotometer. You will record your own data, the class averages and then graph all of the data. Lab write-up requirements: Annotated graph Detailed conclusion This device measures how much light is transmitted through a particular solution. It will allow us to measure the “density” of algae in a sample, which corresponds to the population size. RQ: How does the population size of algae change over a 2-week period? Hypothesis: Create a hypothesis graph about what you think will happen to our algae over the course of the next two weeks? Explain your hypothesis. IV/DV/Controls: IV: Time (in days) DV: population size, measured by “optical density” using a spectrophotometer Controls: Rinse cuvettes after each use.