Objectives  Understand the concept of dissolved oxygen in bodies of water. Describe the factors that change the dissolved oxygen level in bodies of water . Interpret dissolved oxygen data and understand how changes in dissolved oxygen affect the organisms living in the water

For Teachers Pre-Test Answer Key Post-Test Answer Key Teacher Procedure For Students Printable Pre-Test Printable Post-Test Student Procedure Student Activity Journal [All documents are Microsoft Word documents.]

Pre-Test
Multiple-choice items make up the pre-test.
Printed copies of the exams have been provided for your students. You may print out additional copies if you desire. Access the answer key (among the resources above) to check your students' answers.

Post-Test
Multiple-choice items make up the post-test.
Printed copies of the exams have been provided for your students. You may print out additional copies if you desire. Access the answer key (among the resources above) to check your students' answers.

Lesson Presentation 
This lesson introduces the students to the concepts of dissolved oxygen in water.  The concept will be explained thoroughly in the lesson, but the teacher may want to provide hands-on examples for the students to aid them in grasping this concept.  One suggestion of a class demonstration would be using an aquarium bubbler in a beaker of water and explaining the concept that way.  The student will be exposed to reasons why dissolved oxygen is so important to organisms that live in the water and many different factors that effect the amount of dissolved oxygen that is present in a given body of water. The student will also gain an appreciation for measuring dissolved oxygen both quantitatively and qualitatively.   

Activity
The activity is designed to help the students understand and appreciate varying levels of dissolved oxygen in water and what effect the differing oxygen levels have on the fish.  Specifically, the students will observe changes in the fish's behavior and activity level when placed in different environments.  The students will also gain experience in testing dissolved oxygen using a test kit.  In setting up the experiment, students will be able to see how dissolved oxygen changes in a given volume of water in response to temperature changes.  This experiment will hopefully give students a greater appreciation for aquatic habitats and how they are affected by human intervention.  

Tools and Resources

Software used in the lesson: 
Microsoft WORD 
Microsoft Internet Explorer or Netscape Navigator

Introduction | Objectives | Pre-Test | Presentation | Activity | Post-Test
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