Mock
CE-Bio
CERTIFICATE BIOLOGY
NEW MASTERING BASIC CONCEPTS
BIOLOGY MOCK EXAM IV
PAPER 2
(1 hour)
1
You should check that no questions are missed in this paper. Note
the words 'END OF PAPER' after the last question.
2
Answer ALL questions.
3
All questions carry equal marks.
4
You should put only ONE answer for each question. NO MARKS
will be given if you put more than one answer.
Certificate Biology New Mastering Basic Concepts
Mock Exam IV Paper 2
 Oxford University Press 2005
There are 36 questions in Section A and 24 questions in Section B.
The diagrams in this paper are NOT necessarily drawn to scale.
Section A
1
The photograph below shows the plant cells that have reached equilibrium with the
surrounding salt solution:
cell X
cell Y
Why do cell X and cell Y have different appearances?
2
3
A
Their cell membranes have different permeability to water.
B
Their cell membranes have different permeability to solutes.
C
Their cell walls have different permeability to solutes.
D
Their cell sap has different water potential.
All the cells in a green leaf
A
have chloroplasts.
B
are surrounded by cell walls.
C
contain nuclei.
D
carry out respiration.
A balloon was fitted to the mouth of a bottle containing yeast and warm glucose solution.
After 3 days, the balloon inflated mainly due to
A
the expansion of air in the bottle.
B
the evaporation of water from the contents.
C
the vapourization of ethanol from the contents.
D
the release of gas from the contents.
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4
5
Peristalsis along the small intestine is carried out by its
(1)
villi.
(2)
longitudinal muscles.
(3)
circular muscles.
A
(1) only
B
(3) only
C
(2) and (3) only
D
(1), (2) and (3)
The diagrams below show two types of neurones:
Which of the following parts of a neurone stimulates the muscles directly?
6
A
P
B
Q
C
R
D
S
Which of the following structures provide(s) nutrients to the lens of the eye?
(1)
choroid
(2)
suspensory ligament
(3)
cornea
A
(1) only
B
(3) only
C
(1) and (2) only
D
(2) and (3) only
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Directions: Questions 7 and 8 refer to the diagram below, which shows a pyramid of numbers:
7
8
9
Which of the following food chains is represented by the pyramid of numbers?
A
fruit tree leaf -> caterpillar -> bird -> snake -> wolf
B
fruit tree -> caterpillar -> spider -> frog -> snake
C
sunlight -> microscopic algae -> shrimp -> fish -> shark
D
whale -> sea snake -> fish -> worm -> phytoplankton
Which of the following statements about the shape of the pyramid of numbers is correct?
A
The number of organisms decreases from trophic levels 2 to 1 because energy is lost
through incomplete digestion of food.
B
The number of organisms increases from trophic levels 3 to 2 because the biomass of
of the organisms is large enough to support the organisms at the next trophic level.
C
The number of organisms decreases from trophic levels 4 to 5 because energy is lost
through respiration.
D
The number of organisms increases from trophic levels 1 to 2 because energy is
gained from the sun.
The table below shows the results of a number of tests on a sample:
Result
Test end of Albustix paper
Benedict's test
Iodine test
blue-green colour
brick-red precipitate
brown
The sample contains
A
plasma only.
B
grape juice only.
C
pancreatic juice and egg white only.
D
gastric juice and potato extract only.
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Directions: Questions 10 and 11 refer to the diagram below, which shows the transverse section
of an intestinal villus:
10
11
12
13
What are the main food substances absorbed into X?
A
fatty acids and glycerol
B
fats
C
glucose
D
amino acids
Water absorption in the small intestine is facilitated by
A
the large lumen of X.
B
the high pressure in Y.
C
the presence of digested food in X.
D
the presence of digested food in Y.
Homoiotherms can maintain their body temperature using internal heat. The source of this
internal heat is
A
radiation.
B
ATP.
C
respiration.
D
enzymes.
Some micro-organisms produce ethanol and others produce lactic acid because
A
they have different energy requirements.
B
they have different fermentation enzymes.
C
they live on different substrates.
D
the supply of oxygen is different.
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14
The table below shows the density of stomata in three leaves:
Leaf
Density of stomata (number / mm2)
Upper epidermis
Lower epidermis
X
214
0
Y
98
101
Z
40
200
Which of the following statements about the leaves is incorrect?
15
A
X is from a floating plant.
B
Y is arranged in an upright position on the plant.
C
Compared with the upper epidermis, the lower epidermis of Z is more exposed to
sunlight.
D
In the dark, more water is lost from the lower epidermis than from the upper
epidermis of Z.
The diagram below shows the internal lining of a human organ:
The mucus
16
A
protects the stomach from the action of the digestive enzymes.
B
protects the stomach from the action of the gastric acid.
C
digests bacteria from inhaled air.
D
traps bacteria from inhaled air.
A portion of the cerebrum of an old man is damaged in a stroke. Which of the following
may be the consequence of the brain damage?
A
The old man will lose his speech.
B
The old man will not be able to maintain balance during walking.
C
The old man will not be able to swallow his saliva.
D
The diaphragm muscles of the old man will not contract.
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Directions: Questions 17 to 19 refer to the photograph below, which shows a part of the lung
model:
X
Y
Z
17
18
19
The cartilage in structure X
(1)
produces sound.
(2)
reduces friction.
(3)
helps in support.
A
(2) only
B
(3) only
C
(1) and (2) only
D
(2) and (3) only
Capillary Y receives blood from
A
the aorta.
B
the hepatic vein.
C
the pulomonary artery.
D
the pulmonary vein.
Water accumulates in space Z will
A
shorten the distance for diffusion of carbon dioxide.
B
shorten the distance for diffusion of oxygen.
C
reduce the surface area for dissolving oxygen.
D
increase the amount of dissolved oxygen going into the capillaries.
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Directions: Questions 20 to 22 refer to the model below, which represents different parts of a
flowering plant. The model is left in different places for 5 hours and its weight loss is
recorded.
20
21
22
23
Which part of a plant is represented by the plastic sheet?
A
phloem
B
xylem
C
stoma
D
leaf
What does the change in the colour of the cotton wool represent?
A
transpiration
B
transpiration pull
C
translocation
D
active transport
At which of the following locations will the model show the highest weight loss?
A
in the balcony
B
in the bathroom
C
in the bedroom
D
in the sitting room
Which of the following sequence of events is correct?
A
ovulation -> menstruation -> implantation -> fertilization
B
ovulation -> menstruation -> fertilization -> implantation
C
menstruation -> ovulation -> fertilization -> implantation
D
menstruation -> ovulation -> implantation -> fertilization
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Directions: Questions 24 and 25 refer to the family tree below, which shows an occurrence of a
lung disease caused by a recessive gene. Only Kat in the family has inherited the
disease. The probability of an individual in the population carrying the recessive gene
is about 1/400.
24
25
26
Prior to Jane and Bob having children, what would be the estimated probability of them
having a child with the lung disease?
A
1/4
B
1/400
C
1/160 000
D
1/640 000
Jane and Bob are going to have their fourth child. What is the probability of inheriting the
lung disease in this child?
A
1/2
B
1/3
C
1/4
D
1/400
If both the oviducts of a woman are cut and tied,
(1)
she will have no menstruation.
(2)
her ovaries will degenerate.
(3)
no ovum can reach the uterus.
A
(2) only
B
(3) only
C
(1) and (2) only
D
(1) and (3) only
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27
The diagram below shows the muscles of a leg:
P
R
S
Q
Which muscle(s) must contract when standing on the tiptoe?
28
A
Q
B
S
C
P and Q
D
R and S
A student used one of his eyes to look at four objects within a period of eight seconds. The
graph below shows the change in the curvature of his lens:
Which of the following objects was the student looking at from the 4th to the 6th second?
A
a distant stationary object
B
a stationary object nearby
C
an object moving away from him
D
an object moving towards him
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29
The diagram below shows a part of the human digestive system:
X
What may happen if duct X is blocked?
A
Blood glucose level increases.
B
Food rich in protein causes indigestion.
C
Glucose appears in urine.
D
Faeces become greasy.
Directions: Questions 30 and 31 refer to the graph below, which shows the change in the pH of
the plaque after eating sweets:
30
31
What causes the drop in pH at X?
A
the acid in the sweets
B
the acid released from the bacteria in the plaque
C
the breakdown of sugar by the enzymes in the saliva
D
the breakdown of sugar by the bacteria in the plaque
At which time period may tooth decay occur?
A
P
B
Q
C
R
D
S
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32
33
34
In genetic engineering, scientists use enzymes to
(1)
cut out the desired gene out from an organism.
(2)
join pieces of DNA together.
(3)
promote the division of modified host cells.
A
(1) only
B
(3) only
C
(1) and (2) only
D
(2) and (3) only
Potato cubes of the same mass are put in sucrose solution of different concentrations.
Which of the following graph correctly shows the change in the mass of potato cube with
the concentration of sucrose solution?
A
B
C
D
Which of the following comparisons between a reflex action and a voluntary action is
correct?
Reflex action
Voluntary action
A
speed of response is faster
speed of response is slower
B
stereotyped
not stereotyped
C
learning required
learning not required
D
not under conscious control
under conscious control
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35
The diagram below shows a set-up in bright light. After 5 hours, the leaf is tested for starch
with iodine solution.
Which of the following leaf shows the result of the iodine test?
36
A
B
C
D
The diets recommended for soldiers in Arctic conditions and in tropical conditions are
different. What should the Arctic diet include?
A
more dietary fibre
B
more vitamin C
C
more protein
D
more fat
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Section B
37
The chart below describes some features of four different plants:
Which of the above is a ginger plant?
38
A
P
B
Q
C
R
D
S
The diagram below shows a simulation of a chemical reaction:
Which of the following combinations is correct?
Closed lock
Open lock
Key
A
glucose
glycogen
insulin
B
starch
maltose
carbohydrase
C
lipid
fatty acid
bile
D
glycogen
glucose
glucagon
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39
The graph below shows the oxygen input and output of a submerged plant:
Which of the following processes are carried out by the plant at 12:00?
40
41
(1)
photosynthesis
(2)
respiration
(3)
transpiration
A
(1) only
B
(2) only
C
(1) and (2) only
D
(1), (2) and (3)
When light is shone on a young shoot from one side,
A
growth only happens on the shaded side.
B
growth only happens on the illuminated side.
C
cells on the shaded side divide more quickly.
D
cells on the shaded side are more elongated.
There are often algae living inside corals. These algae contribute to the colour of the corals
and generally do not survive outside them. The corals grow slowly if the algae are absent.
This relationship between the algae and the corals is called
A
mutualism.
B
commensalism.
C
competition.
D
predation.
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42
The graph below shows the change in air pressure in the lungs:
At what time do the external intercostal muscles start to relax?
43
A
time zero
B
1st second
C
2nd second
D
3rd second
The bar chart below shows the concentration of DDT, a pesticide, in the body of four
organisms in the same food chain:
Which organism is at the highest trophic level?
A
P
B
Q
C
R
D
S
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44
The tree diagram below shows the evolution of some vertebrates:
Which of the following pairs of vertebrates are closest to each other?
45
A
1 and 2
B
1 and 6
C
2 and 3
D
4 and 5
A student was given the same food and drink for the first and the second days. The bar chart
below shows her loss in the volume of sweat and urine:
Assuming the environmental conditions in the two days are the same, which of the
following statements is correct?
A
The concentrations of urea and salts in the urine were higher on day 1.
B
Less metabolic waste was produced in the body on day 2.
C
Sweating increased on day 2 to maintain the water potential of body fluid.
D
The student was doing more exercise on day 2.
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Directions: Questions 46 and 47 refer to the diagram below, which shows a commercial
production of antibodies:
46
47
48
The production process takes advantage of what characteristic of the tumour cells?
A
the absence of nuclei in the tumour cells
B
the continuous division of the tumour cells
C
the ease of fusion of the tumour cells with other mammalian cells
D
the large amount of food stored in the tumour cells
Which of the following statements about the antibodies produced is incorrect?
A
The antibodies are proteins.
B
The action of the antibodies is specific.
C
The antibodies can be used to detect or treat diseases caused by antigen X.
D
The antibodies have a memory of antigen X.
During the initial stage of growth of a seedling, its dry weight decreases because of
A
translocation.
B
transpiration.
C
respiration.
D
seed dispersal.
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49
The diagram below shows a kidney machine in helping patients with kidney failure to
purify their blood:
blood in
used dialysis fluid
pump
dialysis tubing
with differential
permeability
similar to
capillary
blood out
fresh dialysis fluid
Which substances in the fresh dialysis fluid should be at a lower concentration than in the
blood?
50
A
glucose and urea
B
amino acids and glucose
C
salts and glucose
D
salts and urea
The photograph below shows a transverse section of an orange:
X
From which structure is X developed?
A
ovary
B
ovary wall
C
ovule
D
stigma and style
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51
52
What determines the sex of a baby?
A
chromosome content of the ovum of the mother
B
chromosome content of the sperm of the father
C
age of mother at which pregnancy occurs
D
diet of mother during pregnancy
The diagram below shows a longitudinal section of a young root:
Cells at region X
53
(1)
are haploid.
(2)
are undifferentiated.
(3)
increases their length under the influence of low auxin concentration.
A
(2) only
B
(3) only
C
(1) and (2) only
D
(1) and (3) only
Which of the following can be explained by the theory of natural selection?
(1)
the emergence of antibiotic-resistant bacteria
(2)
the occurrence of mutation
(3)
the existence of variations within a species
A
(1) only
B
(3) only
C
(1) and (2) only
D
(1) and (3) only
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54
55
56
Which of the following is/are transported by phloem?
(1)
minerals
(2)
sucrose
(3)
starch
A
(2) only
B
(1) and (2) only
C
(1) and (3) only
D
(1), (2) and (3)
Which of the following is the most convincing evidence for the evolution of organisms
from simpler pre-existing organisms?
A
age of the Earth
B
present-day existence of single-celled organisms
C
fossil record
D
geographical distribution of organisms
The graphs below show the change in the breathing rate of a student when he is given
various gas mixtures to inhale:
From the results shown in the graphs, what is the main cause of an increase in breathing
rate?
A
an increase in oxygen concentration
B
an increase in the amount of water vapour
C
a decrease in carbon dioxide concentration
D
an increase in carbon dioxide concentration
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Directions: Questions 57 and 58 refer to the diagram below, which shows the production of
genetically modified crop plants. In nature, bacteria X are capable of transferring the
disease-causing genes from their loops of DNA into the plant chromosomes, resulting
in plant infection.
57
58
The vector in the above process is
A
the DNA loop from bacterium X.
B
the DNA loop from bacterium Y.
C
the disease-causing gene.
D
the herbicide-resistant gene.
The crop plant produced in the above process
(1)
cannot be infected by bacteria X in nature.
(2)
can pass the acquired characteristic to its offspring.
(3)
has one additional set of chromosomes in its cells.
A
(1) only
B
(2) only
C
(1) and (3) only
D
(2) and (3) only
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59
60
A boy was born with colour blindness. Which of the following statements about the boy
is/are correct?
(1)
The boy must have inherited the allele for colour blindness from his mother.
(2)
The sisters of the boy must not have colour blindness.
(3)
The rod cells of the boy are abnormal.
A
(1) only
B
(2) only
C
(3) only
D
(1) and (2) only
The diagram below shows the correction for short sight using a laser beam:
The laser beam is used to
A
decrease the curvature of the lens.
B
increase the curvature of the lens.
C
decrease the curvature of the cornea.
D
increase the curvature of the cornea.
END OF PAPER
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Biology Mock Exam IV Paper 2
Question No.
Answer
Question No.
Answer
1.
2.
3.
4.
5.
D
B
D
C
D
31.
32.
33.
34.
35.
B
C
A
B
C
6.
7.
8.
9.
10.
A
B
C
A
B
36.
37.
38.
39.
40.
D
C
B
C
D
11.
12.
13.
14.
15.
D
C
B
C
D
41.
42.
43.
44.
45.
A
B
C
A
D
16.
17.
18.
19.
20.
A
B
C
C
D
46.
47.
48.
49.
50.
B
D
C
D
C
21.
22.
23.
24.
25.
B
A
C
B
C
51.
52.
53.
54.
55.
B
A
A
A
C
26.
27.
28.
29.
30.
B
B
C
D
D
56.
57.
58.
59.
60.
D
A
B
A
C
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