Reflection: Checks for Understanding Water on the Move: Osmosis (#2 of 3) - Section 3: Instructional Input/Student Activities


The four criteria for scoring this assignment were:

1. Conclusive statement: The hypotheses were written by students, therefore some will be supported by the data and others contradicted.

2. Supporting data (High & Low): The data table clearly show that fish swimming in the 0% water die on average 100% (20/20) and those in water die only 5% (1/20).

3. Explanation of the data: The trend is to relate a higher solute percentage to a higher survival rate. As the salt percent goes up, so does the number of survivors. This is merely showing how the MV and RV relate.

4. Scientific explanation: This is where students apply their understanding of osmosis to explain why more saltwater fish die in pure water. Essentially, their cells have around 3.5% salinity, therefore when placed in 0% salinity water, the water flows into the cells and ruptures many of their cells.

Saltwater Fish Conclusion A: Scored as follows: 1, 1, 0, 0 =2/4

Saltwater Fish Conclusion B: Scored as follows: 1 (although "supported" is better term than "right"), 1, 1, 1 (although a more specific answer involving the exact effect on cells would be better) =4/4

  Checks for Understanding: Fish is fish, or is this actually the case?
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Water on the Move: Osmosis (#2 of 3)

Unit 2: 2) Cells ("Form and Function")
Lesson 15 of 20

Objective: Students will be able to understand the hierarchical nature of multicellular organisms. Furthermore, students will be able to model the process of osmosis and predict and explain its outcomes given the conditions of the environment.

Big Idea: The structure of the cell membrane in addition to specific internal and external conditions dictate how water diffuses sometimes with drastic results!

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Science, diffusion, cells, form vs. function, Osmosis, Concentration Gradient, permeability, models, cell transport, hierachical organization, scientific conclusions
  60 minutes
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