Osmosis (OCR GCSE Biology A (Gateway Science Suite)): Flashcards

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Osmosis
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Definition of osmosis

Movement of water from less to more concentrated solution through partially permeable membrane

Water potential in dilute solution

High water potential

Water potential in concentrated solution

Low water potential

Direction of water movement in osmosis

High to low water potential (down concentration gradient)

Energy use in osmosis

Passive (no energy used)

Isotonic solution

External conc = internal, no net water movement

Hypertonic solution

External conc > internal, water moves out

Hypotonic solution

External conc < internal, water moves in

Animal cells in hypotonic solution

Burst

Animal cells in hypertonic solution

Shrivel

Plant cells in hypotonic solution

Swell, develop turgor pressure

Function of turgor pressure

Keeps leaves and stems rigid

Plant cells in hypertonic solution

Become soft, undergo plasmolysis

Define plasmolysis

Cell membrane moves away from cell wall

Result of plasmolysis

Cell death

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Cell Structure

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Transport in Cells

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