karina123
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i need to know what osmosis active transport and diffusion is and examples of them
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GcSe KiD
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Osmosis - The net movement of water molecules through a partially permeable membrane from an area of higher concentration to an area of lower concentration eg - water from soil into roots happens through osmosis

Diffusion - The net movement of molecules from an area of higher concentration into an area of lower concentration. eg - perfume spreading out in the air

Active transport - The net movement of molecules against a concentration gradient using energy released from respiration - nutrients from blood into gut
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_jessfisher
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Dependent whether or not you need this for A Level or GCSE, the definition is basically the same.
Diffusion is the net movement of particles from an area of high concentration to low concentration, or down a concentration gradient. It is a passive process therefore does not require energy from ATP.

There are different types of diffusion including facilitated e.g. through a protein gated channel.

Osmosis is a type of diffusion whereby water molecules move from a high concentration of water to a low concentration of water, again a passive process, through a partially permeable membrane.

Active transport is basically the opposite of diffusion whereby particles move from an area of low concentration to high concentration, e.g. against a concentration gradient and requires energy from ATP, assisted by enzymes.

Hope this helps.
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username2585877
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Diffusion - the movement of particles down a concentration gradient

Osmosis - diffusion of water particles

Active transport - the movement of particles against a concentration gradient
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