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F4 Biology Chapter 3 Movement of Substances Across PlasmaMembrane
A) Related Keywords and definition
No Word Definition / keywords
1 Simple diffusion Net movement ofmolecules or ions from a region ofhigh
concentration to a region of lower concentration.
2 Osmosis Diffusion of water molecules from a region ofhigh water
concentration/ low solute concentration to a region of low
water concentration/ high solute .
3 Facilitated diffusion Refers to the movement of hydrophilic molecules or ions
across the plasma membrane down the concentration gradient
with the help of transport proteins.
4 Active transport Movement of molecules or ions from a region oflower
concentration to a region of higher concentration ( against
the concentration gradient) across the plasma membrane.
5 Hypertonic Contain a high concentration of solutes than that of the cell.
6 Hypotonic Contain a low concentration of solutes than that of the cell.
7 Isotonic Contain a same concentration of solutes than that of the cell.
8 Plasmolysis A shrinking of the cytoplasm in plant cells due to osmosis.
9 Haemolysis The bursting and the release of the contents of the cells into
the surroundings.
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