osmosis and diffusion

diffusion

Movement of molecules from an area of higher concentration to an area of lower concentration. across a semi permiable membrane

Osmosis

Diffusion of water through a selectively permeable membrane from an area of high concentration to one of low

Hypertonic animal cells

higher solute conc. than outside. water moves out (cell will shrivel and may die)

hypotonic animal cells

lower solute conc. water will move in due to osmosis (cell will enlarge, bust and die

isotonic animal cell

Equal conc. , water moves in and out at same rate (cell remains intact)

turgor pressure

force of cytoplasm and vacuole against cell wall

plasmolysis

shrinking of cytoplasm away from cell wall due to osmosis

hypertonic plant cells

if plant cell is in soil more concentrated than cytoplasm, water will leave causing it to wilt. cell membrane moves away from cell wall, loses turgor pressure

isotonic plant cells

same conc as cytoplasm, water moves in and out at same rate. cell remains intact

hypotonic plant cells

solvent less concentrated than cytoplasm. water enters vacuole causing swelling & pushes cytoplasm against cell wall (turgor pressure) this gives plants strength (no wilting) do not bust due to cell wall

osmosis and food preservation

high water conc draws out moisture by osmosis forming microbes