w
w
ap
eP
m
e
tr
.X
w
om
.c
s
er
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Ordinary Level
* 4 8 2 3 8 1 5 6 7 0 *
5096/21
HUMAN AND SOCIAL BIOLOGY
Paper 2
May/June 2011
2 hours
Candidates answer on the Question Paper.
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
Write in dark blue or black pen.
Do not use staples, paper clips, highlighters, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Write your answers in the spaces provided on the question paper.
Section A
Answer all questions.
You are advised to spend no longer than 1 hour on Section A.
Section B
Answer both questions.
Section C
Answer either question 9 or question 10.
For Examiner’s Use
1
2
3
At the end of the examination fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part
question.
4
5
6
Section A
sub-total
7
8
Section B
sub-total
9
10
Total
This document consists of 22 printed pages and 2 blank pages.
DC (NH/SW) 31890/4
© UCLES 2011
[Turn over
2
BLANK PAGE
© UCLES 2011
5096/21/M/J/11
3
Section A
For
Examiner’s
Use
Answer all the questions in this section.
Write your answers in the spaces provided.
1
(a) Fig. 1.1 shows a photograph of blood as seen under the microscope.
A
red blood
cell
B
C
Fig. 1.1
(i)
Red blood cells transport oxygen.
State another function of red blood cells.
.............................................................................................................................. [1]
(ii)
Complete the table by naming A, B and C and stating a function for each.
name
function
A
B
C
[6]
(b) When the skin is cut the blood forms a clot.
State two functions that a blood clot performs.
1. ......................................................................................................................................
2. .................................................................................................................................. [2]
© UCLES 2011
5096/21/M/J/11
[Turn over
4
A scientist carried out an investigation into some aspects of the circulatory systems of four
students, D, E, F and G while they were resting. The following measurements were taken:
•
•
•
•
haemoglobin content of the blood,
oxygen content of oxygenated (arterial) blood,
oxygen content of deoxygenated (venous) blood,
the volume of blood pumped out by the heart at each beat (cardiac output).
The results are shown in Fig. 1.2.
15
haemoglobin / 10
g per 100 cm3
5
blood
0
student
D
student
E
student
F
student
G
student
D
student
E
student
F
student
G
student
D
student
E
student
F
student
G
student
D
student
E
student
F
student
G
20
aterial
blood
15
oxygen conc / 10
cm3 per 100 cm3
5
blood
0
20
venous
blood
15
oxygen conc / 10
cm3 per 100 cm3
5
blood
0
10
cardiac output /
5
dm3 per min
0
Fig. 1.2
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
5
Use the information from Fig. 1.2 to answer questions (c) to (f).
For
Examiner’s
Use
(c) Student D has figures within the normal range.
As blood flows through the capillaries, oxygen will be lost to the tissues.
Calculate the percentage loss of oxygen as blood flows through the capillaries of
student D.
Show your working.
answer = .............................................. % [2]
Hypoxia is a condition where the availability of oxygen to the tissues is reduced. Students E,
F and G all suffer from hypoxia, but for different reasons.
(d) (i)
The scientist suspected that student F was not obtaining enough iron from his diet.
Explain the evidence for this.
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
.............................................................................................................................. [2]
(ii)
Using only evidence from Fig. 1.2, suggest how student F’s body is compensating
for the results of his iron shortage.
..................................................................................................................................
.............................................................................................................................. [1]
(e) Student G’s heart is pumping less efficiently than that of student D.
Give two pieces of evidence from Fig. 1.2 to support this statement.
1. ......................................................................................................................................
..........................................................................................................................................
2. ......................................................................................................................................
...................................................................................................................................... [2]
© UCLES 2011
5096/21/M/J/11
[Turn over
6
(f)
Student E smokes 30 cigarettes per day.
Making use of the information in Fig. 1.2, explain the effects of smoking on student E.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [4]
[Total: 20]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
7
2
Fig. 2.1 shows the human digestive system.
For
Examiner’s
Use
Fig. 2.1
(a) Use label lines and the letters N and P to indicate the areas of the alimentary canal
where amino acids are absorbed and where most water is absorbed.
N: amino acids absorbed
P: most water absorbed
[2]
(b) Explain why chewing food is important in digestion.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [2]
(c) State the importance to health of having acid conditions in the stomach.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [2]
[Total: 6]
© UCLES 2011
5096/21/M/J/11
[Turn over
8
3
Fig. 3.1 shows a horizontal section through the eye of a student who is looking at a distant
object in dim light.
retina
lens
Fig. 3.1
(a) Use label lines and the letters L and M to identify the blind spot and the cornea in
Fig. 3.1.
L: blind spot
M: cornea
[2]
(b) The student then focuses on an object that is close to the eye and in very bright light.
(i)
Describe what happens to the shape of the lens when the student does this.
..................................................................................................................................
.............................................................................................................................. [1]
(ii)
Describe how this change to the lens is brought about.
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
.............................................................................................................................. [3]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
9
(iii)
Describe the change that occurs in response to the very bright light.
..................................................................................................................................
For
Examiner’s
Use
.............................................................................................................................. [1]
(iv)
Explain how this change is brought about.
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
.............................................................................................................................. [2]
[Total: 9]
© UCLES 2011
5096/21/M/J/11
[Turn over
10
4
The effect of nitrate fertiliser on the growth of maize crops was investigated.
Six similar fields used for growing maize were treated with different quantities of nitrate
fertiliser. The quantities of fertiliser added and the crop yields are shown in Table 4.1.
Table 4.1
field
nitrate fertiliser added /
kg per hectare
crop yield /
kg per hectare
1
0
2200
2
40
6000
3
80
8200
4
120
8800
5
140
9000
6
200
9200
(a) Complete Fig. 4.1 by drawing a line graph to show the relationship between the quantities
of fertiliser added and the crop yield. Label the axes including units.
10 000
2000
0
100
200
[4]
Fig. 4.1
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
11
(b) State a reason why the addition of nitrate fertiliser increases crop yields.
..........................................................................................................................................
For
Examiner’s
Use
...................................................................................................................................... [1]
(c) A farmer has two fields of the same size on which he is going to grow maize. He can
afford to buy enough fertiliser to apply it at the rate of 40 kg per hectare.
Deduce and explain why it would be better to apply nitrate fertiliser at the rate of 40 kg
per hectare to both fields, rather than at the rate of 80 kg per hectare to just one field.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [3]
[Total: 8]
© UCLES 2011
5096/21/M/J/11
[Turn over
12
5
A student carried out an investigation on houseflies.
A covered glass dish containing nutrient agar jelly was prepared under sterile conditions.
A housefly was put into the dish and left there for ten minutes with the lid closed. During
this time it walked over the agar jelly and showed feeding behaviour. Afterwards the fly was
removed, the lid replaced and the dish was incubated at 30 °C for several days. The results
are shown in Fig. 5.1.
Fig. 5.1
(a) (i)
State what has grown on the surface of the agar jelly.
.............................................................................................................................. [1]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
13
(ii)
Explain how the habits and actions of the housefly are responsible for the results
shown in Fig. 5.1.
For
Examiner’s
Use
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
.............................................................................................................................. [5]
(b) What would be a suitable control for this investigation?
..........................................................................................................................................
...................................................................................................................................... [1]
[Total: 7]
© UCLES 2011
5096/21/M/J/11
[Turn over
14
6
Fig. 6.1 shows the relationship between body height and mass in humans.
130
120
110
obese
100
90
mass / kg
80
overweight
70
correct
weight
60
50
underweight
40
30
1.4
1.5
1.6
1.7
1.8
height / m
Fig. 6.1
The heights and masses of three students are:
student H
student J
student K
1.80 m and 80 kg
1.50 m and 73 kg
1.75 m and 75 kg
(a) State which student is obese.
...................................................................................................................................... [1]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
15
(b) Table 6.1 gives information about the energy and nutrients provided by 1 kg of six types
of foods.
food
energy
/ kJ
protein / g
fat / g
carbohydrate
/g
vitamin A
/ mg
vitamin C
/ mg
For
Examiner’s
Use
vitamin D
/ mg
eggs
6700
120
124
0
3000
0
15
oily fish
9700
166
180
0
450
0
220
cheese
16 100
254
311
0
4200
0
4
leafy
vegetable
1100
27
0
38
50
600
0
milk
2900
31
39
50
440
20
2
beef
13 100
145
280
0
0
0
0
Table 6.1
(i)
Name two foods in Table 6.1 that should be avoided if the student identified in (a)
wished to reach an acceptable body mass.
.............................................................................................................................. [1]
(ii)
State which food in Table 6.1 would give the most protection against rickets.
.............................................................................................................................. [1]
(iii)
Name the food in Table 6.1 that would best promote the healing of wounds.
.............................................................................................................................. [1]
(c) It is important that the diet contains enough fibre (roughage) to prevent constipation.
What is fibre?
..........................................................................................................................................
...................................................................................................................................... [1]
[Total: 5]
© UCLES 2011
5096/21/M/J/11
[Turn over
16
Section B
Answer both questions in this section.
Write your answers in the spaces provided.
7
Describe how the body maintains a constant temperature under the following headings: heat
gain, heat retention and heat loss.
heat gain
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
............................................................................................................................................. [3]
heat retention
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
............................................................................................................................................. [7]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
17
heat loss
.................................................................................................................................................
For
Examiner’s
Use
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
.................................................................................................................................................
............................................................................................................................................. [5]
[Total: 15]
© UCLES 2011
5096/21/M/J/11
[Turn over
18
8
(a) Outline the functions of the skeleton.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [6]
(b) Describe how the features of tendons and ligaments relate to their functions in the
body.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [5]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
19
(c) Explain how muscles release the energy needed for contraction.
..........................................................................................................................................
For
Examiner’s
Use
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [4]
[Total: 15]
© UCLES 2011
5096/21/M/J/11
[Turn over
20
Section C
Answer either question 9 or question 10.
Write your answers in the spaces provided.
9
(a) Measles is a human disease caused by a virus.
Explain why a person who has recovered from measles is unlikely to suffer from the
disease again.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [5]
(b) The disease smallpox has been eliminated as a result of the campaign by the World
Health Organisation (WHO), whereas tuberculosis (TB) has not been eliminated.
Discuss the reasons for this difference.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [4]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
21
(c) State three ways in which HIV can be spread and for each explain how its spread can
be limited.
For
Examiner’s
Use
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [6]
[Total: 15]
© UCLES 2011
5096/21/M/J/11
[Turn over
22
10 (a) Define the following:
(i)
For
Examiner’s
Use
good health
..................................................................................................................................
..................................................................................................................................
.............................................................................................................................. [2]
(ii)
disease
..................................................................................................................................
..................................................................................................................................
.............................................................................................................................. [2]
Diseases can be grouped into categories. Infectious diseases, such as cholera, are one
category.
(b) Describe how cholera is spread and state the measures that can be taken to prevent it
spreading.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [7]
© UCLES 2011
5096/21/M/J/11
23
(c) State two other categories of disease and give an example of each one.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [4]
[Total: 15]
© UCLES 2011
5096/21/M/J/11
For
Examiner’s
Use
24
BLANK PAGE
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of
Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
© UCLES 2011
5096/21/M/J/11