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Title: IGCSE Biology Osmosis topic
Description: Grade 9 (Year 10) Osmosis (Hypertonic, Isotonic, Hypotonic, Plasmolysis in cells) notes Short and straight to the point notes, for quick understanding of the differences

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Diffusion = Net movement of molecules from a region of high concentration to a region of low
concentration down a concentration gradient

Osmosis = Net movement of water particles (Less concentrated) from a region of high-water potential
to a region of low water potential (More concentrated) through a semi permeable membrane

Hypotonic = When a solution/cell has a higher water potential than another solution (less dilute) such as
distilled water

Hypertonic = When a solution/cell has a lower water potential than another solution (more dilute) such
as salt water

Isotonic = When a solution/cell has the same water potential as another solution

Plasmolyzed: Plasmolysis is the process in which cells lose water in a hypertonic solution
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Explanation with cells below (page 2)

Animal cells cannot be plasmolyzed when put in a hypertonic solution as they don't have a cell wall

In a Hypertonic solution, Animal cells shrink due to the water inside the cell moving into the hypertonic
solution to even out the water potentials

Animal cells will burst in a hypotonic solution as they don't have a cell wall to keep them turgid
(swollen)

Plant cells will wilt (flaccid) and become plasmolyzed in a hypertonic solution as the cell peels away
from the cell wall and crumples in on itself

Plant cells will become turgid when put in a hypotonic solution as the vacuole receives water from the
solution and expands, pushing the rest of the cell towards the cell wall which keeps the cell turgid
Title: IGCSE Biology Osmosis topic
Description: Grade 9 (Year 10) Osmosis (Hypertonic, Isotonic, Hypotonic, Plasmolysis in cells) notes Short and straight to the point notes, for quick understanding of the differences