Q1. Substances can move into and out of cells by three processes.
The diagrams show the concentration of different substances inside and outside a
root hair cell.
How would each substance move into the root hair cell?
Draw one line from each root hair cell to the correct process.
Root hair cell
Process
(2)
Q2. Some students investigated the effect of the different concentrations of sugar in four
drinks, A, B, C and D, on the movement of water across a partially permeable
membrane.
The students:
•
made four bags from artificial partially permeable membrane
•
put equal volumes of 5% sugar solution in each bag
•
weighed each bag containing the sugar solution
•
placed one bag in each of the drinks, A, B, C and D
•
after 20 minutes removed the bags containing the sugar solution and weighed
them again.
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The diagram below shows how they set up the investigation.
(i)
The bag in drink A got heavier after 20 minutes.
Explain why.
______________________________________________________________
______________________________________________________________
___________________________________________________________ (3)
Q3.
Capillaries are blood vessels in the body which join the arteries to the veins. They have
walls which are one cell thick and so are able to exchange substances with the body cells.
(i)
Name two substances that travel from the muscle cells to the blood in the
capillaries.
1. _________________________________________________________________
2. _________________________________________________________________
(2)
(ii)
Glucose is one substance that travels from the blood in the capillaries to the body
cells. Explain how this happens.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
(2)
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Mark schemes
Q1.
(a)
all three correct for 2 marks
one or two correct for 1 mark
2
[5]
Q2.
concentration (of sugar) in the bag was higher (than in the drink)
allow concentration (of sugar) in the drink was lower (than in
the bag)
or
higher concentration of water outside the bag or in the drink / boiling tube
allow higher water potential outside the bag or lower water
potential inside the bag
1
(so) water moved in (to the tubing)
allow water moves down its concentration gradient
do not allow sugar moving
1
by osmosis
allow diffusion (of water)
do not allow sugar moving by osmosis or water moving by
active transport
1
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Q3.
(i)
any two from:
urea
carbon dioxide
water
lactic acid
2
(ii)
higher concentration of glucose or more glucose in blood than cells
1
diffuses across
1
[4]
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