Page 20 - Osmosis and Diffusion - FULL

L I - O A

A single layer of plant (onion) cells has been placed on a microscope slide and viewed
under a microscope. One of three water concentrations – pure water, normal water or
salt water – was added to the cells. Observe the effects of the different concentrations
pure water
normal RBC pure water pure water salt solution of water on the cells. Fill in the table and answer the questions based on your
salt solution
normal RBC
normal RBC equal distribution of water high water salt solution swelled onion cells - salt solution - water leaves cell -membranes shrink,
swelled onion cells -
high water
low water
equal distribution of water
low water
pure water - water moves into cells
equal distribution of water and solute molecules high water concentration low water concentration observations. swelled onion cells - pure water - water moves into cells salt solution - water leaves cell -membranes shrink,
salt solution - water leaves cell -membranes shrink,
concentration
cell walls stay in place
concentration
concentration
and solute molecules and solute molecules outside cell concentration outside cell pure water - water moves into cells cell walls stay in place cell walls stay in place
outside cell
outside cell outside cell starting point - normal cells P ( ) C
outside cell starting point - normal cells
starting point - normal cells

water moves
water moves
water moves into cell water moves N W P W S W
water moves
into cell
into cell water moves out of cell pure water
out of cell
increased pressure out of cell cell shrivels normal RBC salt solution
increased pressure
pure water
pure water
increased pressure causes cell to swell, burst cell shrivels cell shrivels high water salt solution swelled onion cells -
causes cell to swell, burst
normal RBC
salt solution
normal RBC
causes cell to swell, burst equal distribution of water concentration low water salt solution - water leaves cell -membranes shrink,
swelled onion cells -
swelled onion cells -
high water
high water
and solute molecules outside cell concentration pure water - water moves into cells salt solution - water leaves cell -membranes shrink,
cell walls stay in place
equal distribution of water
salt solution - water leaves cell -membranes shrink,
equal distribution of water
low water
low water
concentration
concentration
pure water - water moves into cells
and solute molecules A (
) C outside cell starting point - normal cells pure water - water moves into cells cell walls stay in place
and solute molecules
concentration
cell walls stay in place
concentration
outside cell
outside cell
outside cell starting point - normal cells
outside cell
starting point - normal cells
N W water moves S W
P W
water moves
into cell water moves out of cell
water moves
water moves
water moves
into cell
into cell
increased pressure cell shrivels out of cell
out of cell
causes cell to swell, burst
increased pressure
increased pressure
cell shrivels
causes cell to swell, burst cell shrivels
causes cell to swell, burst
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