Question

match each term on the left with the best descriptor on the right. use each only once.

1. concentration
2. diffusion
3. equal amount of water inside a cell as outside
4. more water outside a cell than inside
5. osmosis
6. more solute outside a cell than inside
7. selectively permeable membrane

descriptor
a) moves of particles like oxygen into cells
b) amount of a substance in a certain place
c) moves water into and out of cells
d) allows some substances through

1. you have just bought a tropical fish for your freshwater (no salt) aquarium. unfortunately, you do not realize it is a saltwater fish, which is isotonic to salty water environments. using your knowledge of osmosis, explain why this fish will not survive in your aquarium.
2. complete the table by writing whether solutes and water move inside or outside the cell.

• hints: with diffusion, solutes move from an area of high concentration to an area of low concentration. with osmosis, wherever more salt is, water follows! or, water also goes from an area of high amount of water to an area of low amount of water.

diffusion	osmosis
does the solute move inside or outside the cell?	does water move inside or outside the cell?	intracellular fluid (inside the cell)	extracellular fluid (outside of cell)
		5% salt	10% salt
		10% salt	10% salt
		3% glucose	1% glucose
		2% protein	1% protein
		9% salt	9% salt
		13% water	25% water

Explanation:

1. Concentration refers to the amount of a substance in a certain place, so it matches b.
2. Diffusion is the movement of particles like oxygen into cells, so it matches a.
3. Equal amount of water inside a cell as outside is an isotonic situation not directly matched here but concept - related to osmosis.
4. More water outside a cell than inside is a situation related to osmosis.
5. Osmosis is the movement of water into and out of cells, so it matches c.
6. More solute outside a cell than inside is a hypertonic situation related to osmosis.
7. A selectively permeable membrane allows some substances through, so it matches d.
8. A salt - water fish is isotonic to salty water. In a freshwater aquarium, the outside environment has a much lower salt concentration (higher water concentration) compared to the fish's cells. By osmosis, water will move into the fish's cells, causing them to swell and potentially burst, leading to the fish's death.

14.

DIFFUSION	OSMOSIS

Answer:

1. b
2. a
3. N/A (not directly matched in given options but related to osmosis conceptually)
4. N/A (related to osmosis conceptually)
5. c
6. N/A (related to osmosis conceptually)
7. d
8. The fish will not survive because water will move into its cells by osmosis due to the difference in salt concentration between the freshwater aquarium and the fish's isotonic salty - water environment, causing cell swelling and potential bursting.
9. See above table for water movement in osmosis scenarios. For diffusion, solute moves from high to low concentration area (inside or outside depending on concentration gradient).