Too Much Life. Activity 12: Too Much Life LIMITED LICENSE TO MODIFY. These PowerPoint® slides may...

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”?

Introduction

Read the introduction and Background Information. Use the Read, Think, Take Note Strategy.

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.

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.

How does the rate of cellular respiration affect the oxygen levels available in an aquatic ecosystem?

Challenge

Procedure

Why does Cup A not receive any yeast?

Procedure

Once you have completed the Procedure, compare your results to those of several other pairs.

Follow Up

Which solution turned white first? Why?

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

Follow Up

Using the evidence you gathered in your experiment, how could you explain the eutrophication and dead zones in Chesapeake Bay?

Analysis 7

How does the rate of cellular respiration affect the oxygen levels available in an aquatic ecosystem?

Revisit the Challenge

cellular respiration dead zone eutrophication organism population

Key Vocabulary

Too Much Life. Activity 12: Too Much Life LIMITED LICENSE TO MODIFY. These PowerPoint® slides may...

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