GCSE Biology
Biology topic 3 (Infection and response) – Higher tier
Time: 30 minutes
Name
Set
10Y1 Bi
Raw score / 30
Teacher
Miss Smith
Grade region
Date:
Q1
Q2
Q3
Q4
Q5
White blood cells
Antibiotic
resistance
Plant disease
Plant disease
identification
Monoclonal
antibodies
Pupil feedback
1
2
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2
3
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Q1.
The body’s immune system protects us from diseases.
Describe the different ways in which white blood cells protect us from infectious diseases.
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(Total 4 marks)
Q2.
The table shows changes in resistance to the antibiotic penicillin in one species of
bacterium between 1991 and 1996.
Years
Percentage of cases where
bacteria
were resistant to penicillin
1991 – 92
7
1993 – 94
14
1995 – 96
22
A doctor was asked to treat a patient who had a sore throat.
(i)
How does penicillin help to treat infection?
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(1)
(ii)
Use the data in the table to suggest why the doctor should not prescribe penicillin.
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(2)
(Total 3 marks)
Q3.
Tobacco mosaic virus (TMV) is a disease affecting plants.
The diagram below shows a leaf infected with TMV.
© Nigel Cattlin/Visuals Unlimited/Getty Images
(a)
All tools should be washed in disinfectant after using them on plants infected with
TMV.
Suggest why.
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(1)
(b)
Scientists produced a single plant that contained a TMV-resistant gene.
Suggest how scientists can use this plant to produce many plants with the
TMV-resistant gene.
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(1)
(c)
Some plants produce fruits which contain glucose.
Describe how you would test for the presence of glucose in fruit.
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(2)
(d)
TMV can cause plants to produce less chlorophyll.
This causes leaf discoloration.
Explain why plants with TMV have stunted growth.
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(4)
(Total 8 marks)
Q4.
A gardener is looking at the plants in his greenhouse.
(a)
Some of the plants have a disease.
Give two ways the gardener could identify the pathogen infecting the plants.
1. _________________________________________________________________
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2. _________________________________________________________________
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(2)
(b)
Plants can become unhealthy if they do not have essential mineral ions.
Describe the appearance of plants with:
•
nitrate deficiency
•
magnesium deficiency.
Nitrate deficiency ____________________________________________________
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Magnesium deficiency ________________________________________________
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(2)
(c)
Plants need other mineral ions.
•
Potassium ions are needed for healthy root growth.
•
Phosphate ions are needed for healthy flowers and fruits.
The gardener makes his own garden compost.
The percentage (%) of minerals in his compost was compared with two fertilisers he
could buy.
The data are shown in the table below.
Percentage (%) mineral content
Nitrate
ions
Phosphate
ions
Potassium
ions
Cost
in £ /
kg
Garden
compost
0.5
0.3
0.8
0.00
Fertiliser S
5.0
1.3
6.6
4.99
Fertiliser T
3.0
12.0
6.0
9.99
The gardener buys Fertiliser S.
Explain why he chose Fertiliser S.
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(4)
(Total 8 marks)
Q5.
Monoclonal antibodies are used to measure the levels of hormones in the blood.
Pregnant women produce the hormone HCG.
HCG is excreted in urine.
Figure 1 shows four pregnancy test strips.
Figure 1
(a)
Which test strip shows a negative test result?
Tick one box.
A
B
C
D
(1)
(b)
Monoclonal antibodies are used for pregnancy testing.
Give one other use of monoclonal antibodies.
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(1)
(c)
Figure 2 shows the parts of a pregnancy test strip.
Figure 2
The pregnancy test strip will show a positive test result when a woman is pregnant.
Explain how the pregnancy test strip works to show a positive result.
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(6)
(Total 8 marks)