Diffusion & Osmosis Worksheet 1. Use arrows to indicate the direction of diffusion in each case: is a molecule that can pass through the cell membrane. is a cell membrane. A)

B)

2. For each of the situations below use an arrow to indicate the net movement of sugar into or out of the cell. (Assume that the sugar molecules can pass through the cell membrane in each case.)

1% sugar

3% sugar

1% sugar

5% sugar

1% sugar

1% sugar

3. The cell membrane is made of a ___________________ ______________________. 4. The cell membrane is _________________permeable. This means that ____________ ______________________________________________________________________. 5. Diffusion always causes particles to move from a region of _______________ concentration to a region of ______________ concentration. 6. Does a cell expend energy when molecules diffuse in or out of the cell? 7. During diffusion, how do the molecules physically get from one place to the other? (Spaceship tractor beam? Winged monkeys?)

SCIENCE 8 – DIFFUSION & OSMOSIS WORKSHEET NAME: Vocabulary A selectively permeable membrane Concentration

Diffusion Osmosis

Use your notes from pages 16 – 19 and the terms in the vocabulary box to fill in the blanks for the following 8 questions. Words may be used more than once. 1)

refers to the amount of a substance in a given space.

2)

is the movement of particles from an area of higher concentration to an area of lower concentration.

3)

allows some materials to pass through it but keeps other materials out.

4)

is the diffusion of water molecules through a selectively permeable membrane.

5)

moves wastes from inside a cell to outside a cell.

6)

can be compared to a window screen.

7)

happens when water particles move from a place where their concentration is higher to a place where their concentration is lower.

8)

is the process by which oxygen is moved into and carbon dioxide is moved into a cell. Use the following diagram to answer questions 9 to 11

A

B

C

9) In which diagram(s) does water move into and out of the cell at the same rate? 10) In which diagrams(s) will the cell begin to swell? 11) Which diagram(s) shows what would happen if a cell were placed in salt water?

12) Match each Term on the left with the best Descriptor on the right. Each Descriptor may be used only once Term

Descriptor

Concentration

A.

Diffusion

B.

Equal amount of water inside a cell as outside

C.

More water outside a cell than inside

D.

Selectively permeable membrane

E.

Osmosis

F.

More water inside a cell than outside

G.

Moves oxygen into cells

Allows some substances through

Amount of a substance in a certain place

Moves water into and out of cells

13) Can you give a plant too much fertilizer? Explain why or why not.

14) You have just bought a tropical fish for your freshwater aquarium. Unfortunately, you do not realize it is a saltwater fish. Using your knowledge of osmosis, explain why this fish will not survive in your aquarium.

Diffusion & Osmosis Worksheet 1. Use arrows to ...

permeable membrane. 5) moves wastes from inside a cell to outside a cell. 6) can be compared to a window screen. 7) happens when water particles move from a place where their concentration is higher to a place where their concentration is lower. 8) is the process by which oxygen is moved into and carbon dioxide.

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