Osmosis

Question 1

Def of osmosis

Answer 1

The passage of water from a region where it has high water potential to a region where it has low water potential through a selectively permeable membrane

Question 2

What is a dynamic equilibrium?

Answer 2

Where there is no net movement of water as the water potential on either side of the mem is equal

Question 3

Diff water potential of external solution compared to cell solution (animal red blood cell)

Answer 3

Higher outside = water moves in = cell swells& bursts, haemoglobin is released
Equal = no change
Lower outside = water leaves cell = cell shrinks, haemoglobin more concentrated, so is darker, shrivelled

Question 4

Potential of external to cell = plant cell

Answer 4

1. Higher outside = moves in, swells, turgid
   Protoplast pushed against cell wall
2. Equal is incipient plasmolysis. Protoplast begins to pull away from cell wall
3. Lower outside = leaves cell = shrinks, plasmolysed. Protoplast completely pulled away from cell wall