Movement of Substances

Diffusion equal conc. of ink Eg 1 http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html Eg 2 high conc. of ink low conc. of ink

Effect of Osmosis in Plant Cell In solution of lower water potential Water leaves the cell. Cell shrink and becomes flaccid (plasmolysis). Tough cell wall retains its own shape. In solution of same water potential No net gain or loss of water. Cell remains the same . In solution of higher water potential Water enters the cell. Vacuole expands and exerts a pressure ( turgor pressure ) against the cell wall. Cell expands and becomes turgid . Cell wall prevents the cell from bursting .

Effect of Osmosis in Animal Cell In solution of same water potential No net gain or loss of water. Cell remains the same . In solution of higher water potential Water enters the cell. Cell expands and burst due to absence of cell wall . In solution of lower water potential Water leaves the cell. Cell shrinks and becomes crenated .

QuickCheck 2 1(a) Predict whether each potato strip will become shorter or longer. 1(b) Arrange the size of the potato strips from shortest to longest. 8% sugar solution 3% sugar solution 15% sugar solution potato strips of 5% sugar solution A B C