Name: ________________

Diffusion and Osmosis Webquest

Diffusion thru Membrane

http://www.indiana.edu/~phys215/lecture/lecnotes/diff.html (Click on Diffusion with Arrows)

1. At the beginning of the animation, how many particles are on each side of the membrane?

2. Are the particles moving in only one direction, or are they moving in both directions? Why?

3. Watch the animation for 2 minutes, or until it reaches NO NET FLOW. How many particles are on each side of the membrane?

4. When there is NO NET FLOW, the cell is said to reach what?

5. What is meant by the website author when he states, “diffusion goes from the higher concentration side to the lower concentration side?

Why is there no energy needed?

11. What happens to the cell?

Osmosis effects on the cell

http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm

12. Cell membranes are semi-permeable. What does this mean?

Are cell membranes permeable to water?

13. The word “solute” has been used in several of the websites. What do you think the term “solute” means or refers to?

14. Press Play for Hypertonic: What happens to the cell in a hypertonic solution? Why? Why does water move this way?

15. Press Play for Hypotonic: What happens to the cell in a hypotonic solution? Why? Why does water move this way?

16. Press Play for Isotonic: What happens to the cell in an isotonic solution? Why? Why does water move this way?

http://programs.northlandcollege.edu/biology/Biology1111/animations/transport1.html