too much life. activity 12: too much life limited license to modify. these powerpoint® slides may...
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Activity 12
Too Much Life
Activity 12: Too Much LifeActivity 12: Too Much Life
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Activity 12: Too Much Life
Get Started
What did you learn about dead zones in Activity 1, “Ecosystems and Change”?
Activity 12: Too Much Life
Introduction
Read the introduction and Background Information. Use the Read, Think, Take Note Strategy.
Activity 12: Too Much LifeActivity 12: Too Much Life
Activity 12: Too Much Life
Introduction
Yeast is a living, oxygen-consuming organism and performs cellular respiration.
Oxygen dissolved in water is consumed by aquatic organisms performing cellular respiration.
Sugar from the milk (lactose) is a food source for the yeast.
Activity 12: Too Much Life
Introduction
Methylene blue is a chemical indicator that is blue in color when added to a solution that contains oxygen.
Methylene blue turns colorless as oxygen is depleted from a solution.
Activity 12: Too Much LifeActivity 12: Too Much Life
How does the rate of cellular respiration affect the oxygen levels available in an aquatic ecosystem?
Challenge
Activity 12: Too Much Life
Procedure
Why does Cup A not receive any yeast?
Activity 12: Too Much Life
Procedure
Once you have completed the Procedure, compare your results to those of several other pairs.
Activity 12: Too Much Life
Follow Up
Which solution turned white first? Why?
Activity 12: Too Much Life
Follow Up
A. How does the concentration of organisms in a body of water affect the rate of oxygen consumption?
B. How does your answer to 3a relate to eutrophication?
Analysis 3
Activity 12: Too Much Life
Follow Up
Using the evidence you gathered in your experiment, how could you explain the eutrophication and dead zones in Chesapeake Bay?
Analysis 7
Activity 12: Too Much LifeActivity 12: Too Much Life
How does the rate of cellular respiration affect the oxygen levels available in an aquatic ecosystem?
Revisit the Challenge
Activity 12: Too Much LifeActivity 12: Too Much Life
cellular respiration dead zone eutrophication organism population
Key Vocabulary