ACTIVE TRANSPORT

Grade: 7 - 8

Duration: 45 minutes

Background Information: Active transport is the movement of molecules or ions across a membrane, but in the opposite direction of diffusion usually occurs. Diffusion occurs when particles move across a membrane reaching a state of equilibrium. However, Active Transport through a membrane needs energy to move large molecules and minerals. All cells in the body have oxygen in them to perform its functions, such as breathing, eating or eliminating waste.

WARM-UP ACTIVITY: Write in complete sentences.

1. What makes a cell membrane a selective membrane?

2. What is the difference between osmosis and diffusion?

The teacher expresses her delight with the enthusiasm to class in response to their hard work display this week. As a reward, the class will learn how to make a vegetable salad today. The teacher expects many reactions. At this time, the treater, will choose an assistance. We are going to use the Video Flex Microscope for observation.

MAKING A SALAD

PROBLEM: How to make a garden salad?

HYPOTHESIS: (Answers will vary)

MATERIALS: lettuce, tomatoes, carrots, and cucumbers,pepper, herbs, salt, bowl, knife

PROCEDURE:

1. Cut up into small portions- lettuce, carrots, cucumbers, and tomatoes

2. Add all the seasoning: pepper, herbs, and salt

3. Cover the salad and place in the refrigerator

CONCLUSION: The students will write in their Journal , explaining their expectations

of what the salad will look like tomorrow and why?

 

 

Evaluation (Review) With you seat mate, brainstorm together and answer this question.

What is the relationship between action of the water in osmosis and the waitron the solution in diffusion?

SKILL BUILDER: This table is for the teacher's use. To see the table without all the answers, click on active transport below, This could be printed and used as an assessment tool.

ACTIVE TRANSPORT

LARGE PARTICLES

MINERALS

OSMOSIS

DIFFUSION

For other resources click in to the following WEB SITES:

Cell Membrane Transport:

Assessment

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