HKDSE Biology - Osmosis
Compulsory Part I Cells and Molecules of Life
Mechanism of osmosis 💧
Osmosis is a net movement of water molecules through a semipermeable membrane from lower concentration region (higher water potential) to higher concentration region (lower water potential).
Water potential 👉🏻 the measure of potential energy of water which is the force to drive the water movement.
👆🏻 This photo demonstrating how osmosis occurred through a semipermeable membrane (cell membrane).
There are three types of solution which may affect the movement of water in osmosis❗️
👆🏻 This is the effect of isotonic solution, hypotonic solution and hypertonic solution towards animal cell and plant cell.
1. Isotonic solution
2. Hypotonic solution
Heamolysis - red blood cell rupturing under excessive water entering the cell and cause it burst.💥
3. Hypertonic solution
Plasmolysis - cytoplasm shrinking away from the plant cell wall due to excessive water leaving the cell. 🍃
In HKDSE Biology examination, heamolysis and plasmolysis are two important concept under the topic osmosis ❗️ ❕
That's the end of this topic 👏🏻
Written by Bella | HKDSE Biology Specialist @ TUTTEE
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