1. DIFFUSION, OSMOSIS, ACTIVE TRANSPORT

2. BROWNIAN MOTION 3. DYNAMIC EQUILIBRIUM 4. TYPES OF MEMBRANES Type of membrane Size of pores in membrane Particles which can pass through membrane Examples of membranes Impermeable membrane No pores None Lignin (secondary cell wall); waterproofPermeable membrane Large pores All molecules which normally move through living cells Cellulose cell wall (primary cell wall in most plant cells) Semi-permeable membrane (or selectively permeable, or differentially permeable Sub-microscopic pores Water; carbon dioxide; oxygen Cell membrane;tonoplast;all membranes surrounding organelles 5. Semi-permeable membrane SEMI-PERMEABLE MEMBRANE PURE WATER High water concentration GLUCOSE SOLUTION Low water concentration 6. OSMOSIS

This is theNET MOVEMENT of WATER MOLECULESfrom the region ofHIGHER WATER CONCENTRATIONto a region ofLOWER WATER CONCENTRATIONthrough aSEMI-PERMEABLE MEMBRANE.

7. Osmosis Experiment 8. CONTROL 9. Osmosis experiment photos EXPERIMENT CONTROL 10. TURGIDITY AND DYNAMIC EQUILIBRIUM IN PLANT CELLS. 11. A turgid Cell 12. PLASMOLYSIS CELL WALL CELL MEMBRANE TONOPLAST VACUOLE Low water concentration (hypertonic) High water concentration (Hypotonic) 13. Questions

PLASMOLYSIS:

Cell B placed in a solution with a low water concentration.

Exosmosis causes cell contents to shrink, and cytoplasm pulls way from the wall.

Cell becomes soft and flaccid

W: CYTOPLASM X: CELL WALL Y: CELL MEMBRANE Z: VACUOLE 14. ACTIVE TRANSPORT

The movement of molecules of a substance against the concentration gradient (Low to High),

This requires energy provided by a cellsmitochondrion.