|
"Simulating
the Effects of Biodegradable Wastes on Dissolved Oxygen" Lesson
Plan
Keywords: biodegradable
wastes, dissolved oxygen, microbes
Prepared by:
Kristina Rogers, Loyalsock Township High School
Lesson Plan
Grade Level: seventh through ninth grade
Total Time Required
for Lesson: 90-minute continuous blocks
Setting: classroom
laboratory
Subjects Covered:
biology, environment & ecology
Topics:
aquatic ecosystems, water quality, abiotic & biotic factors
Goals for the
Lesson
- Students will be able
to evaluate the relationship between biodegradable waste and dissolved
oxygen in water.
- Students will be able
to explain the relationship between oxygen levels, bacteria and
the breakdown of organic matter using an indicator solution.
Materials Needed
- lab
activity worksheet
- beakers
- dry yeast
- graduated cylinders
- test tubes and test
tube racks
- stirring sticks
- pipets
- methylene blue solution
- masking tape
- marking pens/pencils
- milk
- water
State Standards Addressed:
E & E Standards: Watersheds and Wetlands (4.1.7 A); Earth
Science Standards: Explain the Behavior and Impact of the Earth's
Water Systems (3.5.7 D); Assess the Value of Water As a Resource
(3.5.10 D)
Teaching Model: Lecture/Discussion,
Cooperative Learning
Methods
- Give each student
a copy of the lab activity
and read over the purpose and discuss the general concept of the
lab with the class.
- Break students into
lab groups and have them complete the pre-lab activities using
their textbooks and any other available references.
- When the groups have
finished the pre-lab activities, discuss the answers to the questions
with the class. Review and discuss the different hypotheses that
the class has constructed and have groups make modifications or
rewrite their hypothesis if necessary.
- Review lab procedures
with class and demonstrate any specific lab techniques. It is
a good idea to show an example of a test tube before and after
the experiment so students know what they are watching for. Assign
lab roles such as set up, facilitator, recorder, and clean up,
if so desired, and then allow groups to begin the lab activity.
- Monitor groups progress
and facilitate as needed.
- When each group finishes
the activity they should clean up their lab station and work on
the conclusion questions.
Evaluation
- Students will analyze
their results and complete the conclusion questions.
- Final class discussion
and evaluation of group results.
Reference
Hach Company (1991).
Experiment 2: Effects of Biodegradable Waste on Dissolved Oxygen.
|
