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Diffusion
02/05/20
06


Diffusion is when something travels from an area of high
concentration to an area of low concentration. For example,
consider the scent from a hamburger...


The "scent particles" from
this hamburger are in high
concentration here:




Eventually they will
"diffuse" out into this area
of low concentration:

Page 2

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Osmosis
02/05/20
06

Osmosis is a "special kind of diffusion". It's when water diffuses from a
concentrated area to a less concentrated area through a partially
permeable membrane (i.e. one that allows water to move through but not
anything else):

Water Sugar solution
In this example the water
molecules will…

Page 3

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02/05/20
06

Strong
sugar
solution
Potato cells




Medium
sugar
solution




Weak
sugar
solution

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Active Transport
02/05/20
06



Active transport is when substances are absorbed _______ a
concentration gradient (like a ball being rolled ___ a hill).
This takes place in the opposite direction to normal _______.
This is how nitrates are taken in by root hair cells:


Root hair cell Root hair
already…

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