lettuce experiment to demonstrate cell diffusion/osmosis.

Aim : How do materials move in and out of the cell?

objective: 1. students will use a lettuce leaf to discover the function of a cell membrane.

2. Students will look at a multicellular lettuce and make-believe that it is a one-cell structure.

3.students will try to figure out what would be allowed into a cell by predictions,observations and by explanation

4.students will do an experiment to show the movement of water into and out of the cell

5.students will be able to state that the cell membrane lets materials in and out of a cell

materials required : Three bowls,food colour,salt,black pepper,water,a large lettuce leaf

Do now : Based on the knowledge aquired

#1 Predict what would happen if you placed a piece of lettuce into a salt solution

#2 Predict what would happen if you placed a piece of lettuce into food colouring

#3 Predict what would happen if you placed a piece of lettuce into a mixture of water and black pepper?

#1 salt solution #2 water food coloring #3 Water Black Pepper

Predict :

Observe :

Explain :

conclusions:

1.using a lettuce leaf to represernt a cell membrane can everything go into a cell ? what can go into and out of a lettuceleaf

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