Page 15 - 02 Cells Biology Notes
P. 15
Cell membranes
• partially permeable (let some substances pass through, but not
others).
• separate 2 solutions: cytoplasm and solution around the cell.
• If the solutions are of different concentrations, osmosis will occur.
Effect of Osmosis on plant and animal cells
1. When placed in H2O:
Concentration of H2O outside the cell
is higher than inside it. Cells will take
in H2O by osmosis:
• plant cells
become turgid (swollen) but do
not burst (have
tough cell wall which is fully
permeable).
• animal cells will burst (no cell
wall).
2. When placed in concentrated sugar
or salt solutions:
Concentration of H2O inside the cell
is higher than outside it. H2O get out of
the cells by osmosis:
