Microsoft Word libs task oosci 11 5090 12 2022

A 
15 
raining 
00:00 
32 
B 
12 
dry 
14:00 
24 
C 
6 
fog
/
rain 
08:00 
3 
D 
5 
dry 
22:00 
16 
14
Some people have a rare heart condition in which the lower left chamber of the heart has not 
developed properly and is much smaller than normal. 
The immediate result of this condition is to cause lower than normal blood flow into which blood 
vessel? 
A
aorta 
B
pulmonary artery 
C
pulmonary vein 
D
vena cava 
15
Which route does blood take around the body? 
A
pulmonary artery 
→
heart 
→
aorta 
→
lungs 
→
pulmonary vein 
→
heart 
→
vena cava 
B
pulmonary vein 
→
heart 
→
lungs 
→
aorta 
→
pulmonary artery 
→
heart 
→
vena cava 
C
vena cava 
→
heart 
→
pulmonary artery 
→
lungs 
→
pulmonary vein 
→
heart 
→
aorta 
D
vena cava 
→
heart 
→
pulmonary vein 
→
lungs 
→
pulmonary artery 
→
heart 
→
aorta 

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7
© UCLES 2022 
5090/12/O/N/22 
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16
The diagram shows the transfer of materials between blood in a capillary and tissue fluid. 
high pressure
blood
low pressure
blood
tissue cells
tissue fluid
tissue fluid
capillary
1
2
3
4
Which row shows the correct labels for the arrows in the diagram? 
1 
2 
3 
4 
A 
carbon dioxide 
glucose 
oxygen 
water 
B 
glucose 
water 
oxygen 
urea 
C 
oxygen 
glucose 
carbon dioxide 
water 
D 
oxygen 
water 
carbon dioxide 
glucose 

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© UCLES 2022 
5090/12/O/N/22 
17
An experiment is set up, as shown. 
Test-tubes 1 and 2 contain limewater. Limewater is a clear solution that turns cloudy in the 
presence of carbon dioxide. Air is pumped through the apparatus. 
test-tube 1
test-tube 2
air flow
air flow
solution to absorb
carbon dioxide
living
animals
What is the appearance of the limewater in test-tubes 1 and 2 after a period of 10 minutes? 
 
test-tube 1 
test-tube 2 
A 
clear 
clear 
B 
clear 
cloudy 
C 
cloudy 
clear 
D 
cloudy 
cloudy 

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9
© UCLES 2022 
5090/12/O/N/22 
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18
Fitness training in athletes reduces the need for anaerobic respiration. It also increases the rate 
at which lactic acid is removed after exercise. 
The table shows the concentration of lactic acid in the blood of four different athletes. They 
exercise for 20 minutes and rest for the next 70 minutes. 
lactic acid concentration
/
mg per 100
cm
3
of blood 
time 
(min) 
athlete 1 
athlete 2 
athlete 3 
athlete 4 
0 
20 
20 
20 
20 
exercise
10 
84 
82 
60 
86 
20 
95 
90 
85 
98 
30 
92 
95 
76 
99 
40 
84 
80 
62 
95 
50 
78 
75 
50 
81 
60 
66 
60 
38 
68 
70 
54 
50 
25 
62 
80 
35 
30 
20 
50 
90 
28 
20 
20 
39 
From the fittest athlete to the least fit, which order is correct? 
A
3 
→
2 
→
1 
→
4 
B
1 
→
2 
→
4 
→
3 
C
2 
→
3 
→
4 
→
1 
D
3 
→
1 
→
2 
→
4 

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© UCLES 2022 
5090/12/O/N/22 
19
The diagram shows the human gas exchange system. 
1
3
2
4
Which row shows the correct labelling? 
1 
2 
3 
4 
A 
trachea 
larynx 
bronchiole 
bronchus 
B 
trachea 
larynx 
bronchus 
bronchiole 
C 
larynx 
trachea 
bronchiole 
bronchus 
D 
larynx 
trachea 
bronchus 
bronchiole 
20
What are two main functions of the kidneys? 
A
to make toxins in the blood harmless and to remove excess salt in the blood 
B
to remove excess salt in the blood and to remove urea from the blood plasma 
C
to remove urea from the blood plasma and to convert glucose to glycogen 
D
to convert glucose to glycogen and to make toxins in the blood harmless 
21
Which changes occur when a person walks from a very cold room into a hot room? 
sweating 
skin blood 
vessels 
A
decreases 
constrict 
B
decreases 
dilate 
C
increases 
dilate 
D
increases 
constrict 

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11
© UCLES 2022 
5090/12/O/N/22 
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22
The graph shows measurements taken of one aspect of the internal environment of the human 
body over time. 
0
20
40
time
/
minutes
60
80
body
temperature
/ 
°
C
limits of
variation
What controls the internal environment of the human body to keep each aspect within strict 
limits? 
A
excretion 
B
homeostasis 
C
positive feedback 
D
respiration 
23
When a bright light is shone into the eye, the pupil becomes smaller. 
Which statement explains this response? 
A
Ciliary muscles in the eye contract. 
B
Circular muscles in the iris contract. 
C
Sensory cells in the iris detect the bright light. 
D
Sensory neurones stimulate the ciliary muscles in the iris. 

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12
© UCLES 2022 
5090/12/O/N/22 
24
The flow chart describes a reflex action. 
a painful 
stimulus is 
picked up 
by a ...E... 
→
the 
impulse is 
transmitted 
by a ...F... 
neurone 
→
the impulse 
is passed to 
the ...G... 
neurone via 
the ...H... 
neurone 
→
finally the 
impulse is 
transmitted 
to the ...
I
... 
to create a 
response 
Which row correctly fills the flow chart? 
E 
F 
G 
H 
I 
A 
effector 
relay 
motor 
sensory 
brain 
B 
effector 
sensory 
relay 
motor 
receptor 
C 
receptor 
sensory 
motor 
relay 
effector 
D 
receptor 
motor 
sensory 
relay 
brain 
25
A patient shows symptoms of unexplained weight loss, severe thirst and frequent need of 
urination. 
A test shows high levels of glucose in the urine. 
Which condition is diagnosed? 
A
cardiovascular disease 
B
diabetes 
C
anaemia 
D
obesity 

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13
© UCLES 2022 
5090/12/O/N/22 
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26
Which graph shows the lengths of the biceps and triceps muscles in the upper arm when the 
elbow joint is fully extended and the arm is straight? 
biceps
triceps
length of
muscle
A
biceps
triceps
length of
muscle
B
biceps
triceps
length of
muscle
C
biceps
triceps
length of
muscle
D
27
Four discs, 
A
, 
B
, 
C
and 
D
, each containing a different antibiotic, were placed onto agar gel in a 
Petri dish. The agar gel contained 
E. coli 
bacteria. 
The Petri dish was then sealed and incubated for 24 hours at 35
°
C. 
The results are shown. 
Which antibiotic is most effective? 
A
B
C
D
clear area has
no bacteria
agar gel containing
E. coli
bacteria

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14
© UCLES 2022 
5090/12/O/N/22 
28
Bacteria, fungi and viruses are often grouped together as microorganisms. 
Which statement about microorganisms is correct? 
A 
All types of microorganism are used to produce antibiotics. 
B 
Bacteria and viruses can only be found inside living cells. 
C 
Decomposition is brought about by
 
bacteria and fungi only. 
D 
All microorganisms contain DNA but not in a nucleus. 
29
Two containers, X and Y, were filled with equal amounts of dough mixture for making bread.
The mixture in Y had yeast in it. 
The containers were then left in a warm place for two hours. The diagram shows their 
appearance after this time. 
container X
container Y
dough mixture
without yeast
dough mixture
with yeast
Which substance produced by the yeast causes the difference between the dough in X and Y? 
A
alcohol 
B
carbon dioxide 
C
lactic acid 
D
oxygen 
30
What is the principal source of energy input to biological systems? 
A 
food chains 
B 
photosynthesis 
C 
producers 
D 
the Sun 

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15
© UCLES 2022 
5090/12/O/N/22 
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31
In the carbon cycle, what is one way that carbon can enter the atmosphere? 
A 
burning 
B 
feeding 
C 
fossilisation 
D 
photosynthesis 
32
The graph shows the concentration of dissolved oxygen at different points along a river. 
At which point is sewage emptied into the river? 
A
B
C
D
concentration of
dissolved oxygen
distance along river
direction of water flow
33
A gardener has two groups of strawberry plants, labelled X and Y. They are grown to maturity 
under identical conditions. He makes some observations and concludes that those in group X 
were produced asexually and those in group Y were grown from seeds. 
Which observations most closely support his conclusions? 
1 Group X plants produced flowers all at the same time. 
2 Group X plants produced flowers which varied in shape and size, some of which 
were produced earlier than others. 
3 Group Y plants produced flowers all at the same time. 
4 Group Y plants produced flowers which varied in shape and size, some of which 
were produced earlier than others. 
A
1, 2, 3 and 4 
B
1 and 4 only 
C
2 and 3 only 
D
4 only 

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16
© UCLES 2022 
5090/12/O/N/22 
34
The diagram shows a section through a flower. 
Where does fertilisation take place? 
A
B
C
D
35
Human gametes are different from each other. 
Which information about male gametes is correct? 
 
size 
numbers released
at one time 
movement 
A 
large 
normally one 
cannot move on their own