Osmosis (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards
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Definition of osmosis
Definition of osmosis
Water moves from less to more concentrated solution through partially permeable membrane
Water potential in dilute solution
Water potential in dilute solution
High water potential
Water potential in concentrated solution
Water potential in concentrated solution
Low water potential
Direction of water movement in osmosis
Direction of water movement in osmosis
From high to low water potential
Energy requirement of osmosis
Energy requirement of osmosis
None, it is passive
Isotonic solution
Isotonic solution
External conc. same as internal, no water movement
Hypertonic solution
Hypertonic solution
External conc. higher, water moves out of cell
Hypotonic solution
Hypotonic solution
External conc. lower, water moves into cell
Effect of hypotonic solution on animal cells
Effect of hypotonic solution on animal cells
Cells burst
Effect of hypertonic solution on animal cells
Effect of hypertonic solution on animal cells
Cells become shrivelled
Effect of hypotonic solution on plant cells
Effect of hypotonic solution on plant cells
Water moves in, vacuole swells, turgor pressure develops
Function of turgor pressure in plants
Function of turgor pressure in plants
Keeps leaves and stems rigid
Effect of hypertonic solution on plant cells
Effect of hypertonic solution on plant cells
Water moves out, cells become soft
Plasmolysis
Plasmolysis
Cell membrane moves away from cell wall, cell dies