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Cell Structure
Question Paper
Level
IGCSE
Subject
Biology
Exam Board
Edexcel
Topic
Structure and Functions in Living Organisms
Sub-Topic
Cell Structure
Booklet-Module
Question Paper-Double Award (Paper 1B)
Time Allowed:
23 minutes
Score:
/19
Percentage:
/100
Grade Boundaries:
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1. The photograph shows a variegated leaf. The dark (green) part of the leaf has cells that
contain chloroplasts. The white part of the leaf has cells that do not contain chloroplasts.
(a) Describe the role of chloroplasts in leaf cells.
(2)
. . . . . . ..................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . ..................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . ..................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
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(b) The diagram shows a leaf cell from the green part of the leaf.
A
B
C
Name the parts labelled A, B and C.
(3)
A . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . .. . . . . . . . . . . . . . . . .
B
. .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . . . .. . . . . . . . . . . . . . . . .
C
. .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . .. . . . . . . . . . . . . . . . .
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(c) The diagram shows a plant with variegated leaves.
The plant was destarched by leaving it in the dark for 24 hours.
Leaf X then had a strip of black paper attached to both the upper and lower surfaces.
It was then sealed in a flask containing a solution of sodium hydroxide, a substance
that absorbs carbon dioxide.
Leaf Y also had a strip of black paper attached to both the upper and lower surfaces.
The plant was then placed in the light for 24 hours and then a starch test was
carried out on leaf X and leaf Y.
leaf Y
leaf X
white part
of leaf
strip of
black paper
green part
of leaf
sodium
hydroxide
solution
cotton wool
plug
The five leaves, A to E, show the possible appearance of leaf X and leaf Y after the
starch test.
A
B
C
D
E
= yellow colour showing no starch present
= blue black colour showing starch present
(i) Which of the leaves A to E matches the result you would obtain after testing
leaf X and leaf Y for starch?
(2)
leaf X .......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................. . . . . . . . . . . . . . . . . . . .. . . . . .
leaf Y ......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ . . . . . . . . . . . . . . . . . . . .. . . . . .
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(ii) Explain what happens in a leaf when it is destarched.
(2)
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
(iii) Describe how the green pigment in leaf cells is removed safely before testing
a leaf for the presence of starch.
(3)
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
. . . . . . .................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . .. . . . . . . . . . . . . . . . . . . . . .
(iv) Name the chemical used to test for starch.
(1)
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(Total for Question 1 = 13 marks)
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2 (a) The diagram shows a plant cell drawn by a student.
(i) Label the diagram to show the selectively permeable membrane.
(1)
(ii) Name three parts of a typical plant cell that are not found in an animal cell.
(3)
1 . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . .. . . . . . . . . . . . . . . . . . .
2 . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . .. . . . . . . . . . . . . . . . . . .
3 . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................................................................... . . . . . . .. . . . . . . . . . . . . . . . . . .
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(b) The diagram shows a glass container divided in half by a selectively permeable membrane.
One half contains water and the other half contains sucrose solution.
water
sucrose solution
selectively permeable
membrane
(i) Complete the diagram below to show the change to the level of the water
and the level of the sucrose solution after one hour.
(1)
(ii) Name the process that causes the change in the level of the water and the level of the
sucrose solution.
(1)
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(Total for Question 2 = 6 marks)