DIFFUSION & OSMOSIS WEBQUEST
Directions: Write your name, date, and class period on a piece of white-lined paper*, ** titled
DIFFUSION & OSMOSIS WEBQUEST. Answer the following questions for each particular
link/animation. Use complete sentences and be sure to number your answers correctly.
* or use a computer to word process.
** or print the worksheet form.
Check out all the links below and answer the corresponding questions.
Diffusion Animation
http://lessons.harveyproject.org/development/general/diffusion/diffnomemb/diffnomemb.html
Question 1. What TWO things do you notice about the movement of the particles?
Diffusion thru Membrane – Click on “ Diffusion ”, then “ Diffusion with Arrows ”
http://www.indiana.edu/~phys215/lecture/lecnotes/diff.html
Question 2. At the beginning of the animation, How many particles are on each side of the
membrane?
Question 3. Are the particles moving in only one direction, or are they moving in both
directions?
Question 4 . Watch the animation for 2 minutes, or until it reads “NO NET FLOW”. Now how
many particles are on each side of the membrane?
Question 5 . What is meant by the website author when he states “”diffusion goes from the
higher concentration side to the lower concentration side”?
Osmosis Animation – Answer the questions found on the webpage, also written below…
http://zoology.okstate.edu/zoo_lrc/biol1114/tutorials/Flash/Osmosis_Animation.htm
Question 6 : “ What is happening to the water (blue) and the dissolved substances (green and
red). What is the same? What is different?
Osmosis Animation 2
Read the entire website, including the scroll bar under the animation. Read the scroll bar for each
step of the animation. Click GO, then NEXT, then GO until you have seen all steps. RESET will
start you over again. Fill the chart in under the columns marked with an asterisk*, in the
boxes labeled with letters A, B, etc..
http://www.colorado.edu/eeb/web_resources/osmosis/
Question 7.
STEP #
1. After the
red particles
are added.
INSIDE CELL
BLUE (H2O) particles
INSIDE cell
RED particles INSIDE
cell
*
*
A.
OUTSIDE CELL
BLUE (H2O) particles
OUTSIDE cell
B.
RED particles OUTSIDE
cell
F.
C.
BLUE (H2O) particles
OUTSIDE cell
G.
D.
RED particles OUTSIDE
cell
H.
E.
CONCENTRATION
of WATER
MOLECULES
BEFORE OSMOSIS
(TO BE DONE
TOGETHER IN
CLASS)
2 . After
OSMOSIS
(movement of the
blue water
molecules)
BLUE (H2O) particles
INSIDE cell
RED particles INSIDE
cell
CONCENTRATION
of WATER
MOLECULES
AFTER OSMOSIS
(TO BE DONE
TOGETHER IN
CLASS)
Question 8. After performing the experiment, is there a greater concentration of particles
INSIDE or OUTSIDE the cell.
Osmosis & Membrane – Notice that the top of the animation, labeled CYTOPLASM, is
the inside of the cell.
http://www.cat.cc.md.us/courses/bio141/lecguide/unit1/prostruct/hypotonicanim.html
Question 9. What are the holes in the membrane called?
Question 10. At the beginning of the animation, are there more “Free Water Molecules” inside
or outside the cell?
Question 11. Which way do the “Free Water Molecules” move? Into or out-of the cell?
Question 12. Why do the “Free Water Molecules” move in this direction?