B1.9 Active transport
Collins Trilogy pg.22-23
Oxford Biology 3rd pg.20-21
① REVISE
Grade 4
B1.9 Active
transport
Grade 6
Grade 8
I can define active transport as the I can explain why active transport I can describe how active transport takes
movement of a substance against is important for living organisms. place.
a concentration gradient using
energy.
I can identify where active
transport takes place.
I can explain the differences
between diffusion, osmosis, and
active transport.
I can suggest how a cell that carries out
active transport is adapted to this function.
1.3.3
Active transport moves substances from a more dilute solution to a more concentrated solution
(against a concentration gradient). This requires energy from respiration.
Active transport allows mineral ions to be absorbed into plant root hairs from very dilute solutions in the soil.
Plants require ions for healthy growth.
It also allows sugar molecules to be absorbed from lower concentrations in the gut into the blood which has a
higher sugar concentration. Sugar molecules are used for cell respiration.
1) Match up the keyword with its definition
Carrier protein
Water that has a substance dissolved in it
Solution
A protein in the cell membrane that transports substances
Concentration
gradient
A difference in concentration eg between the inside and outside of a cell
2) Name where these examples of diffusion take place
1)
2)
3)
4)
5)
6)
Cell membrane
Energy
Carrier protein
Substance taken in by cell
High Concentration
Low Concentration
3) What substances are taken in by the roots by active transport? …………………………………………...
4) Where is sugar absorbed by active transport? ……………………………………………
5) Complete this table (the first one has been done for you
Diffusion
Down a concentration gradient
✗
Energy needed
✗
Notes
Active transport
✓
Against a concentration gradient
Substance moved
Osmosis
Dissolved solutes
Gases and
dissolved gases
Dissolved solutes
Partially permeable
membrane needed
Carrier protein needed
also diffuse
TEST YOURSELF ②
Grade 3
What is active transport?
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Describe an example of active transport in the roots of a plant
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Describe an example of active transport in the gut of an animal
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Grade 6
Explain the difference between Active transport and Diffusion. (Make sure you mention a) the
direction that particles move b) the role of carrier proteins c) the presence of a membrane d) the
need for a source of energy
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Grade 8
Describe what is happening in the diagram to the
right.
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Explain why a root hair cell has a large surface area
and many mitochondria but no chloroplasts.
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