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Summary Biology B1
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Biology B1-1.6 Includes osmosis, diffusion, adaptation of animals
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AQA GCSE triple science biology: Organising an ecosystem
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'l
I .
I 1 ,
l l l l , l l l l
Diffusion =
the
spreading out of the particles of a
gas ,
or of
any other in
a solution ( a solute)
The net movement is from an area of
high concentration to
an area of low concentration of the particles .
Rates of
diffusion
If big
there is a difference in concentration between two areas , diffusion
will take place quickly Although many particles will move randomly
.
in the other direction ( not
by force) However there is only a small ,
difference in concentration between two areas , the net movement
by
diffusion will be quite slow .
Net movement -
-
particles moving in -
particles moving out
Temperature also affects In the the difference in concentration , the faster the
general , greater
the rate of diffusion An . rate of diffusion . The difference between two areas of concentration
increase in temp . means is called the concentration
gradient .
The bigger the difference ,
the steeper
the particles in a
gas or the concentration
gradient and the faster the rate of diffusion .
solution move around more
quickly
' ' '
l I l I
'
l l l
, , ,
HOW is osmosis different from diffusion :
A dilute solution of
sugar contains a
high concentration of water ( the solvent) It has a low concentration .
of ( the solute)
sugar
A concentrated sugar solution contains a
relatively low concentration of water and a high
concentration of
sugar .
If the concentration of solutes in
the solution outside the cell is the
If the concentration of solutes same as the internal concentration ,
in the solution is higher than the the solution is isotonic to the cell .
outside concentration the solution
,
is
hypotonic If the concentration is higher out -
side than it is inside it is hypertonic
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