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Lauren Beggs – Fall 2012 1 Biology Lesson Plan

Monday, November 26th, 2012

Unit: Cells Topic: Osmosis Date: 11/26/2012 Class: Biology

Michigan Objectives: B2.5h Explain the role of cell membranes as a highly selective barrier (diffusion, osmosis, and active transport). Illinois Objectives: 12.11.05 Understand how the semi-permeable membranes regulate the flow of substances in and out of the cell body. My Lesson Objectives: ● Explain how water travels through a semipermeable membrane from hypotonic to hypertonic. Activities: Case Study 1: Students read and discuss an example where too much fertilizer was added to a farmers field. (25 minutes) ● Case Study 2: Students read and discuss an example where distilled water was added to a patient’s blood stream instead of saline solution. (25 minutes)

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Materials/Equipment:

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Copies of the case studies

Assessment: (Embedded, Formal) Formal: Case Study 1: Example with too much fertilizer 1 What sort of environment (hypotonic, hypertonic, isotonic) did the extra fertilizer create around the roots of the corn? 2 Keeping in mind your answers to the previous question, what do you believe caused the corn plants to wilt and eventually die? 3 If Michael’s mistake had been caught earlier, is there anything that could have been done to prevent the corn from dying? 4 Generally, people water their plants with 100% H2O -- no solutes added. What sort of environment does this create around the roots of the plant?

Lauren Beggs – Fall 2012 2 Biology Lesson Plan 5

Briefly explain why plants generally thrive in this sort of environment.

Case Study 2: Example of the distilled water in a person’s veins. 1 What problem did the distilled water in the patient’s bloodestream create? 2 What happened to the patient’s blood cells as a result? 3 Considering the function of red blood cells, why did the patient’s oxygen levels fal? 4 After Tom made his error, is there anything that could have been done to save the patient’s life?