WJEC 2014 Online Exam Review
GCSE Biology 2 Foundation 4471-01
All Candidates' performance across questions
Question Title
1
2
3
4
5
6
7
8
9
N
4738
4740
4738
4740
4735
4736
4736
4734
4487
Mean
4.2
3
2.6
3.1
6.5
3
2.2
3.1
1.2
SD
1.4
1
1.5
1.5
2.3
1.4
1.2
1.3
1.3
Max Mark
8
4
5
6
13
7
6
5
6
FF
52.2
75.8
52.4
50.9
50.3
42.3
36.2
62.5
19.3
Attempt %
100
100
100
100
99.9
99.9
99.9
99.9
94.7
Question
GCSE Biology 2 Foundation 4471-01
9
8
7
6
5
4
3
2
1
19.3
62.5
36.2
42.3
50.3
50.9
52.4
75.8
52.2
0
10
20
30
40
50
60
Facility Factor %
70
80
90
100
1
5
9
2
Examiner
only
Answer all questions.
1. Read the information about cocoa.
• Chocolate is made from cocoa obtained from the pods of the cocoa tree.
• Many trees are killed by disease, pests and climate change.
• Every year 3.7 million tons of cocoa are produced. 70% is produced in Africa. The rest is
produced equally in South America and Asia.
• By 2015 four million tons of cocoa will be needed to meet the demands of the chocolate
industry.
• A mould causes the pods to rot. Farmers use either chemical pesticides or the fungus,
Trichoderma, to kill the mould.
healthy cocoa pods
cocoa pods with pod rot
Use the information and your own knowledge to answer the following questions.
(a) (i)State two factors which can cause cocoa trees to die.
1.
.................................................................
2.
.................................................................
[1]
(ii) Why will the loss of cocoa trees be a problem for farmers in the future?
[1]
(b) Calculate the percentage (%) of cocoa that is produced in Asia.
[1]
...................................
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%
3
(i) What type of organism is Trichoderma? Underline your answer.
(c)
plant
animal
[1]
Examiner
only
microbe
(ii) What term is used for the process which uses a living organism to kill a pest? [1]
Number of rotted pods per tree
...................................................................................................
4 4 71
010 0 03
No treatment
1
2
3
4
5
6
7
8
9
10
With Trichoderma
With chemical pesticides
11
Months
(d)
(i) From the graph above, what is the evidence that Trichoderma can control pod rot?
[1]
(ii)State one advantage of this type of pest control compared with using chemicals.
[1]
(iii) Why may some farmers prefer to use chemical pesticides to kill the mould?
[1]
8
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Turn over.
8
5.(a) Complete the sentence below.
[2]
Enzymes, which are made of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , control the rate of
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . reactions in living cells.
(b) Students investigated the activity of the enzyme amylase, at different pH values. They
used the same volumes of solutions and the same time at each pH.
Results of investigation
pH of solution
6.0
amylase activity
(a.u.)
18
6.5
27
7.0
52
7.5
66
8.0
50
8.5
21
(i) Draw a line graph of the results of the investigation on the grid below by
I. choosing a suitable scale for the amylase activity;
II. plotting the results onto the grid;
III. joining your plots with a ruler.
Amylase activity (a.u.)
5
6
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7
pH of solution
(4471-01)
8
9
[4]
Examiner
only
9
(ii)
I. From the graph opposite, describe in detail the effect of pH on the activity of
amylase.[2]
Examiner
only
II. Calculate the difference in activity of amylase between pH 6.2 and pH 7.
Show your working.
[2]
Answer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a.u.
(iii) The students did not keep the temperature constant during their investigation.
Why did this prevent their investigation from being a fair test?
[1]
(c)
Biological washing powders contain enzymes and are often used in the home. Explain
the advantage of these powders.
[2]
13
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(4471-01)
Turn over.
16
9. Describe the method involved in testing a leaf for the presence of starch.
Each of the stages involved in the method should be described in sequence and the reason for
carrying out each stage should be included.
Your description must include reference to the colour changes shown by the leaf and what these
changes indicate.
[6 QWC]
Examiner
only
6
END OF PAPER
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