Edexcel A-level Bio3 June 2007 Qp
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- Words: 1,060
- Pages: 16
Surname
Centre No.
Initial(s)
Paper Reference
6 1 0 3
Candidate No.
0 3
Signature
Paper Reference(s)
6103/03
Examiner’s use only
Edexcel GCE Biology Biology (Human)
Question Leave Number Blank
Advanced Subsidiary Unit 3 Paper 03 Monday 4 June 2007 – Morning Time: 1 hour Materials required for examination Ruler
Team Leader’s use only
1 2 3
Items included with question papers Nil
Instructions to Candidates In the boxes above, write your centre number, candidate number, your surname, initial(s) and signature. The paper reference is shown above. Check that you have the correct question paper. Answer ALL THREE questions in the spaces provided in this booklet. Show all the steps in any calculations and state the units. Calculators may be used. Include diagrams in your answers where these are helpful.
Information for Candidates The marks for individual questions and parts of questions are shown in round brackets: e.g. (2). The total mark for this question paper is 38.
Advice to Candidates You will be assessed on your ability to organise and present information, ideas, descriptions and arguments clearly and logically, taking account of your use of grammar, punctuation and spelling.
Total This publication may be reproduced only in accordance with Edexcel Limited copyright policy. ©2007 Edexcel Limited. Printer’s Log. No.
N28018A W850/R6103/57570 7/7/7/6/23,000
Turn over
*N28018A0116*
Leave blank
Answer ALL questions in the spaces provided. 1.
(a) Tapeworms are heterotrophic organisms. tapeworm that occurs in dogs.
The diagram below shows part of a
State the mode of heterotrophic nutrition carried out by this animal. ....................................................................................................................................... (1)
(b) On the diagram, label three features that are adaptations to this tapeworm’s mode of nutrition. Under each of your labels, explain how the feature helps this tapeworm carry out its mode of nutrition. All your answers must be written on the diagram within the box. (6)
2
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(c) Compare the mode of nutrition of Rhizopus with that of the tapeworm. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2)
Q1
(Total 9 marks)
*N28018A0316*
3
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2.
The photograph below shows a herd of cattle on an area of dry grassland and scrub that is undergoing desertification in central Australia.
Wayne Lawler / Ecoscene
(a) Suggest two possible causes of the desertification of dry grassland in central Australia. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2)
4
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(b) Describe and explain the processes that lead to desertification of dry grassland. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (4) (c) Suggest two ways of preventing desertification in the driest parts of the world such as Australia. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (4)
Q2
(Total 10 marks)
*N28018A0516*
5
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BLANK PAGE
6
*N28018A0616*
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3.
Over the last 40 years, forests and lakes in Western Europe have shown signs of acid rain damage (see Figure 1). Various treatments to reduce the damage caused by acid rain have been tried. One treatment involves the spreading of powdered limestone over the soil and on the surface of lakes. Figure 1: Conifer trees in Germany damaged by acid rain
Erik Schaffer / Ecoscene
Loch Fleet, a lake in Scotland, has been damaged by acid rain. This lake is surrounded by hills which are covered in coniferous forest. Between April and May 1986, more than 300 tonnes of powdered limestone were spread over the soil surrounding the lake. The pH and aluminium ion concentration of the water in the lake were monitored before and after adding the powdered limestone. The results are shown in Figures 2 and 3.
*N28018A0716*
7
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BLANK PAGE
8
*N28018A0816*
Figure 2: The graph below shows the change in the pH of the water in Loch Fleet in each month in 1986.
Leave blank
Powdered limestone spread over soil
8.0 ± 7.5 ± 7.0 ± 6.5 ± Hp
6.0 ± 5.5 ± 5.0 ± 4.5 ± 4.0 ±
rebmeceD ±
rebotcO ±
rebmevoN ±
Months
rebmetpeS ±
tsuguA ±
yluJ ±
enuJ ±
yaM ±
lirpA ±
hcraM ±
yraurbeF ±
3.0 ±
yraunaJ ±
3.5 ±
0.30 –
Powdered limestone spread over soil
0.25 – 0.20 – 0.15 – 0.10 – 0.05 – – December
*N28018A0916*
– November
– October
– September
– August
Months
– July
– June
– May
– April
– March
– February
0–
– January
Concentration of aluminium ions / mg dm–3
Figure 3: The graph below shows the change in the aluminium ion concentration of the water in Loch Fleet in each month in 1986.
9
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BLANK PAGE
10
*N28018A01016*
Leave blank
(a) Explain the term acid rain. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (1) (b) State two main sources of the pollutants that cause acid rain. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2)
*N28018A01116*
11
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BLANK PAGE
12
*N28018A01216*
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(c) The hills around Loch Fleet are covered in coniferous forest. Suggest three reasons why these forests are more likely to be damaged by acid rain than the deciduous forests found in less hilly areas of Scotland. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 3 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (3) (d) Some of the conifer trees in Figure 1 have been damaged by acid rain. Suggest the symptoms of acid rain damage that might be seen on these conifer trees. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (3)
*N28018A01316*
13
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14
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(e) Describe the changes in pH shown in Figure 2. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2) (f) Describe and explain the change in the aluminium ion concentration in the water after the spreading of the powdered limestone over the soil, as shown in Figure 3. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (4)
QUESTION 3 CONTINUES ON THE NEXT PAGE
*N28018A01516*
15
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(g) Aluminium ions can be harmful to aquatic organisms. aluminium ions on the health of fish.
Describe the effect of
....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2) (h) Describe the possible consequences of a decrease in the number of predatory fish on the food chain of a lake. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2) (Total 19 marks) TOTAL FOR PAPER: 38 MARKS
END
16
*N28018A01616*
Q3
Centre No.
Initial(s)
Paper Reference
6 1 0 3
Candidate No.
0 3
Signature
Paper Reference(s)
6103/03
Examiner’s use only
Edexcel GCE Biology Biology (Human)
Question Leave Number Blank
Advanced Subsidiary Unit 3 Paper 03 Monday 4 June 2007 – Morning Time: 1 hour Materials required for examination Ruler
Team Leader’s use only
1 2 3
Items included with question papers Nil
Instructions to Candidates In the boxes above, write your centre number, candidate number, your surname, initial(s) and signature. The paper reference is shown above. Check that you have the correct question paper. Answer ALL THREE questions in the spaces provided in this booklet. Show all the steps in any calculations and state the units. Calculators may be used. Include diagrams in your answers where these are helpful.
Information for Candidates The marks for individual questions and parts of questions are shown in round brackets: e.g. (2). The total mark for this question paper is 38.
Advice to Candidates You will be assessed on your ability to organise and present information, ideas, descriptions and arguments clearly and logically, taking account of your use of grammar, punctuation and spelling.
Total This publication may be reproduced only in accordance with Edexcel Limited copyright policy. ©2007 Edexcel Limited. Printer’s Log. No.
N28018A W850/R6103/57570 7/7/7/6/23,000
Turn over
*N28018A0116*
Leave blank
Answer ALL questions in the spaces provided. 1.
(a) Tapeworms are heterotrophic organisms. tapeworm that occurs in dogs.
The diagram below shows part of a
State the mode of heterotrophic nutrition carried out by this animal. ....................................................................................................................................... (1)
(b) On the diagram, label three features that are adaptations to this tapeworm’s mode of nutrition. Under each of your labels, explain how the feature helps this tapeworm carry out its mode of nutrition. All your answers must be written on the diagram within the box. (6)
2
*N28018A0216*
Leave blank
(c) Compare the mode of nutrition of Rhizopus with that of the tapeworm. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2)
Q1
(Total 9 marks)
*N28018A0316*
3
Turn over
Leave blank
2.
The photograph below shows a herd of cattle on an area of dry grassland and scrub that is undergoing desertification in central Australia.
Wayne Lawler / Ecoscene
(a) Suggest two possible causes of the desertification of dry grassland in central Australia. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2)
4
*N28018A0416*
Leave blank
(b) Describe and explain the processes that lead to desertification of dry grassland. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (4) (c) Suggest two ways of preventing desertification in the driest parts of the world such as Australia. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (4)
Q2
(Total 10 marks)
*N28018A0516*
5
Turn over
BLANK PAGE
6
*N28018A0616*
Leave blank
3.
Over the last 40 years, forests and lakes in Western Europe have shown signs of acid rain damage (see Figure 1). Various treatments to reduce the damage caused by acid rain have been tried. One treatment involves the spreading of powdered limestone over the soil and on the surface of lakes. Figure 1: Conifer trees in Germany damaged by acid rain
Erik Schaffer / Ecoscene
Loch Fleet, a lake in Scotland, has been damaged by acid rain. This lake is surrounded by hills which are covered in coniferous forest. Between April and May 1986, more than 300 tonnes of powdered limestone were spread over the soil surrounding the lake. The pH and aluminium ion concentration of the water in the lake were monitored before and after adding the powdered limestone. The results are shown in Figures 2 and 3.
*N28018A0716*
7
Turn over
BLANK PAGE
8
*N28018A0816*
Figure 2: The graph below shows the change in the pH of the water in Loch Fleet in each month in 1986.
Leave blank
Powdered limestone spread over soil
8.0 ± 7.5 ± 7.0 ± 6.5 ± Hp
6.0 ± 5.5 ± 5.0 ± 4.5 ± 4.0 ±
rebmeceD ±
rebotcO ±
rebmevoN ±
Months
rebmetpeS ±
tsuguA ±
yluJ ±
enuJ ±
yaM ±
lirpA ±
hcraM ±
yraurbeF ±
3.0 ±
yraunaJ ±
3.5 ±
0.30 –
Powdered limestone spread over soil
0.25 – 0.20 – 0.15 – 0.10 – 0.05 – – December
*N28018A0916*
– November
– October
– September
– August
Months
– July
– June
– May
– April
– March
– February
0–
– January
Concentration of aluminium ions / mg dm–3
Figure 3: The graph below shows the change in the aluminium ion concentration of the water in Loch Fleet in each month in 1986.
9
Turn over
BLANK PAGE
10
*N28018A01016*
Leave blank
(a) Explain the term acid rain. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (1) (b) State two main sources of the pollutants that cause acid rain. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2)
*N28018A01116*
11
Turn over
BLANK PAGE
12
*N28018A01216*
Leave blank
(c) The hills around Loch Fleet are covered in coniferous forest. Suggest three reasons why these forests are more likely to be damaged by acid rain than the deciduous forests found in less hilly areas of Scotland. 1 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 2 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... 3 ..................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (3) (d) Some of the conifer trees in Figure 1 have been damaged by acid rain. Suggest the symptoms of acid rain damage that might be seen on these conifer trees. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (3)
*N28018A01316*
13
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BLANK PAGE
14
*N28018A01416*
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(e) Describe the changes in pH shown in Figure 2. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2) (f) Describe and explain the change in the aluminium ion concentration in the water after the spreading of the powdered limestone over the soil, as shown in Figure 3. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (4)
QUESTION 3 CONTINUES ON THE NEXT PAGE
*N28018A01516*
15
Turn over
Leave blank
(g) Aluminium ions can be harmful to aquatic organisms. aluminium ions on the health of fish.
Describe the effect of
....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2) (h) Describe the possible consequences of a decrease in the number of predatory fish on the food chain of a lake. ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... ....................................................................................................................................... (2) (Total 19 marks) TOTAL FOR PAPER: 38 MARKS
END
16
*N28018A01616*
Q3
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