1. Osmosis Osmosis is simply a type of diffusion.
It is when water moves from areas of HIGH concentration to areas of LOW concentration through a membrane.
We have already witnessed osmosis in TWO of the experiments we’ve done this year. Can you name which two?

4. There were LESS water molecules inside the gummy bear, so the water diffused INTO the gummy bear to try to achieve homeostasis.

5. Egg Experiment Syrup Egg Control Egg Water Egg
LESS water molecules outside the egg, so the water diffused out of the membrane to try to achieve balance
Control Egg
Water Egg
MORE water molecules outside the egg, so the water diffused out of the membrane to achieve balance.

7. Starch & Iodine Experiment

8. Starch & Iodine Experiment

10. What does osmosis and diffusion have in common?
They are both examples of PASSIVE transport.
Passive transport is when molecules are transported throughout a cell or through a membrane WITHOUT the use of ___________.
energy

11. How can I get the green molecules on the top to move across the membrane?
Will they diffuse?
NO. They won’t
move against their
concentration gradient
with PASSIVE
transport.

12. How can I get the green molecules to move across the membrane?
Molecules can use
ACTIVE transport
to move molecules.
It requires energy
to make the protein
“transporter”
function

13. Osmosis/Diffusion Web Resources