Edexcel Gcse Biology/additional Science - Unit B2: The Components Of Life Page 3
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ANSWER ALL QUESTIONS.
Some questions must be answered with a cross in a
box
. If you change your mind about an answer, put a
line through the box
and then mark your new answer
with a cross
.
CELL TRANSPORT MECHANISMS
1
(a) Substances in the soil are taken up by plant root
hair cells.
The diagram shows the direction of movement of
two substances A and B across the cell membrane
of a root hair cell.
OUTSIDE CELL
INSIDE CELL
cell membrane
high
low concentration
process X
concentration of
PROCESS X
of substance A
substance A
low
high concentration
PROCESS Y
concentration of
of substance B
substance B
(Question continues on next page)
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