Osmosis (AQA GCSE Biology): Flashcards

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Osmosis
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Osmosis definition

Water from less to more concentrated via 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 requirement for osmosis

Passive - does not use energy

Isotonic solution

Same concentration as internal; no net water movement

Hypertonic solution

Higher concentration than internal; water moves out

Hypotonic solution

Lower concentration than internal; water moves in

Animal cells in hypotonic solution effect

Cells burst

Animal cells in hypertonic solution effect

Cells become shrivelled

Plant cells in hypotonic solution effect

Swell, turgor pressure created

Turgor in plants

Pressure keeping leaves and stems rigid

Plant cells in hypertonic solution effect

Become soft, plasmolysis occurs, cell dies

Plasmolysis

Cell membrane moves away from cell wall

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Cell Structure

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Transport in Cells

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Cell Structure

Cell Division

Transport in Cells

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Cell Structure

Cell Division

Transport in Cells

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