Biology: Year 9 Term 2: Diffusion

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Define diffusion. (3)
The net movement of particles from an area of high to low concentration
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Why does diffusion occur? (2)
Particles in a gas or liquid are always moving randomly
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Diffusion is a [what?] process. (1)
Passive
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Which 4 things increase the rate of diffusion? (4)
Heat, Concentration, Distance, Surface area
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Diffusion occurs in cells to swap which gases from which process? (4)
CO2, H2O, O2 - aerobic respiration
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What is an exchange surface? (3)
An area where waste products and incoming reactants are swapped, e.g. the alveoli
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Multicellular organisms need these surfaces instead of using skin because of our... (2)
Smaller SA:V ratio than unicellular organisms
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Name 3 exchange surfaces in other organisms. (3)
Gills, Leaves, Roots
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Other cards in this set

Card 2

Front

Why does diffusion occur? (2)

Back

Particles in a gas or liquid are always moving randomly

Card 3

Front

Diffusion is a [what?] process. (1)

Back

Preview of the front of card 3

Card 4

Front

Which 4 things increase the rate of diffusion? (4)

Back

Preview of the front of card 4

Card 5

Front

Diffusion occurs in cells to swap which gases from which process? (4)

Back

Preview of the front of card 5
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