Part of Unit: Cell Biology
Lesson Plan Overview / Details
In this lesson, the students will explore the differences and similarities between diffusion and osmosis. They will also learn about concentration gradients in reference to solutes and solvents and the different types of solutions.
- 70 Minutes
- 280 Minutes
California Career and Technical Education Standards
- ANR.C.C13.1 Understand the steps of the scientific method.
- ANR.C.C13.3 Use the scientific method to conduct agricultural experiments.
- ANR.C.C5.3 Understand various cell actions, such as osmosis and cell division.
- ANR.FS.11.0 Demonstration and Application
- ANR.FS.5.3 Use critical thinking skills to make informed decisions and solve problems.
- ANR.FS.9.3 Understand how to organize and structure work individually and in teams for effe...
California Academic Content Standards (Reinforced)
- ELA.9-10.R.CAGT.2.5 Extend ideas presented in primary or secondary sources through original analysis...3
- ELA.9-10.R.CAGT.2.6 Demonstrate use of sophisticated learning tools by following technical direction...2
- S.9-12.LS.1.a Students know cells are enclosed within semipermeable membranes that regulate th...1
Objectives and Goals
- Students will properly apply the scientific method to set up their Egg Osmosis Lab.
- Students will understand how the egg acts as a large animal cell that is analogous to the cells in their body.
- Students will be able to explain the concept of a concentration gradient by using their egg as an example.
- Students will understand the difference between a hypertonic and a hypotonic solution.
Activities in this Lesson
- Diffusion in a Baggie - Hooks / Set
When the students first come in, I have a question on the board as their warm up. How many of you use ziploc or plastic baggies on a regular basis? (Allow for student response time) What type of items do you and your family store in the ziploc bags? (Allow for student response) Show examples of baggies that you have stored items in. (Content inside of the baggie doesn't matter, it just helps to demonstrate the use of the baggie) Today, we will investigate just how good our baggies are and if there are some things that shouldn't be stored in plastic baggies. (At this time, I hand the students the "Diffusion in a Baggie" Lab and begin the set up for our mini-lab. I call it a mini-lab, because the results can be seen within the class period.) The students will watch their bags as the lecture and lab set up for the egg osmosis lab continue.
- Diffusion in a Baggie [ Download ] This is a student handout for the lab.
- Egg Osmosis Lab - Lab / Shop
This is the lab that I actually have them set up on a Thursday or Friday and finish the following Thursday or Friday. The lab is a student handout that I give to my students. I break them into groups (their tables) and have them work together to set up and perform the lab. I have everything all set out and I show them how to properly measure the liquids in mL. With my classes, anyone or group who breaks an egg has to bake cookies or a treat for the entire class. This usually works very well, because breaking an egg will also put students behind if they break their egg later on. I have had eggs rupture in the cups before, so you can expect that there will be egg casualties along the way.
- Observing Osmosis Lab [ Download ] The lab handout for students is "Observing Osmosis Lab"
- Osmosis and Diffusion Notes - Lecture
These are notes that I use to give the students some background on cellular activity within the cell. We talk about the movement of materials, both solids and liquids. I ask the students what gives them energy. (I am leading the students through a series of questions to link the need for food to create energy in their body. Once they have talked about the need for food to give them energy, I then ask them how their cells get energy. This leads to the discussion of how materials move in and out of the cell and how their body gets the energy it needs from the cells in their bodies.)
- Osmosis Power Point [ Download ] This is the power point for the lesson on osmosis, diffusion and solutions.
- Assessment Types:
- Surveys, Teacher-Made Test, Observations,
I review material with my students on the board in the form of warm ups. Anything that was covered the day before in a lecture, lab or activity will be reviewed in the warm up questions, I randomly select students to share their answers with the rest of the class and have them defend their answers regardless of if they are right or wrong. It allows me the opportunity to assess the students on a daily bases and to determine if there is a concept that the entire class is missing.
In addition, if I sense through these warm ups that there is a lack of participation of a need to cover a concept more thoroughly, I have students write down questions (anonymously) on a piece of paper that they still do not understand. This is their pass out of class or into class (depending on when it is assigned). Then I place the questions into piles to determine where the need for additional instruction may be.
I will also follow up with a quiz and a unit test when all of the instruction on cells is over.
- Quiz on Cells and their Environment [ Download ] Quiz that reviews cellular functions