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Classification

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Exchange substance


All organism need to exchange substance, this is done via a number of

method; diffusion, osmosis or active transport.
In order for life process, such as respiration or photosynthesis to occur,

certain molecules need to enter organisms, such as water, oxygen or carbon

dioxide. These substances all enter or leave via the processes mentioned

above

 

As mentioned previously osmosis is the movement of water from an area of

high water concentration to an area of low water concentration across a

partially permeable membrane.
Diffusion is the passive movement of particles from an area of high

concentration to an area of low concentration; therefore in many ways

osmosis and diffusion are very similar.
However active transport is completely different. Active transport uses energy

to transport molecules from an area of low concentration to an area of high

concentration, therefore going in the opposite direction to diffusion and osmosis.

 

Related Topic


Exchange Surfaces                Plants                        Active Transport