- Created by: Book_worm205
- Created on: 31-03-19 12:57
Diffusion & Osmosis
- Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration.
- Takes place in both solutions and gases because the particles are free to move about randomly.
- The bigger the concentraion gradient (the difference in concentraion), the faster the diffusion rate.
- Higher temperature = faster diffusion rate (particles have more energy so they move around faster)
- Osmosis is the movement of water molcules across a partially permeable membrane from a region of high water concentration to a region of low water concentration.
- Partially permeable membrane has small holes that only water molecules can pass through and bigger molecules - e.g. sucrose - can't.
- Water molecules pass both ways through the membrane. This happens because the molecules move around randomly all the time.
- Osmosis is a type of diffusion.
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- Active Transport is the movement of molecules across a cell membrane from a region of low concentration to a region of high concentraion, which goes aainst the concentration gradient.
- Root hair takes in minerals using active transport.
- Active Transport stops us from starving.
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