Diffusion in Cells

OSMOSIS IN CELLS NAME ______

DATE ______BLOCK _____

A.  Diffusion of Particles

1.  The diagrams below show osmosis of water molecules into and out of cells. Shade the arrow(s) in each diagram to indicate the overall direction in which water molecules will move.

x x x x x x x x x x x

x

x

x x

x x x x x x x x x

2.  While cleaning out the aquariums, Careless Carrie made a terrible mistake. She put the salt water fish in the fresh water aquarium and the fresh water fish in the salt water aquarium. Complete the diagrams below to illustrate the disastrous results. Draw x's for the water and then arrows (in A and C) to show the direction the water will diffuse, then draw the resulting fish in B and D. (o = salt)

A. Fresh-water aquarium & salt-water fish B. Results for Aquarium A

C. Salt-water aquarium & fresh-water fish D. Results for Aquarium C

B.  Examples of Osmosis

Explain the movement of substances in each of the following situations.

1.  Fresh fruits and vegetables are often sprinkled with water at the grocery store. Why?

2.  Roads are sometimes salted to melt ice. How does the salt affect the plants growing alongside the road?