Download 1516_Pre-Mock exam_S6_Bio_Section A

15-16
Pre-Mock Exam
S.6 BIO
Section A
ECF Saint Too Canaan College
2015–2016 Pre-Mock Exam
S.6 BIOLOGY
(Section A)
Date: 12-11-2015
Time allowed: 2 hour 30 minutes
Total mark: 36 marks (Section A) + 84 marks (Section B)
Name: ____________________
Class: 6 Love ( )
(8:30 a.m. – 11:00 a.m.)
This paper must be answered in English
GENERAL INSTRUCTIONS
1.
There are TWO sections, A and B, in this paper.
You are advised to finish Section A in about 35 minutes.
2.
Section A consists of multiple-choice questions in this question paper.
Section B contains conventional
questions printed separately in Question-Answer Book B.
3.
Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to Section B
should be written in the spaces provided in Question-Answer Book B. The Answer Sheet for Section A
and the Question-Answer Book for Section B will be collected separately at the end of the
examination.
INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS)
1.
Read carefully the instructions on the Answer Sheet. Write your name, class and class number in the
spaces provided.
2.
When told to open this book, you should check that all the questions are there.
Look for the words ‘END OF
SECTION A’ after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS.
You are advised to use an HB pencil to mark all the answers on the Answer
Sheet, so that wrong marks can be completely erased with a clean rubber.
5.
You should mark only ONE answer for each question.
If you mark more than one answer, you will receive
NO MARKS for that question.
6.
No marks will be deducted for wrong answers.
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There are 36 questions in this section.
The diagrams in this section are NOT necessarily drawn to scale.
1.
A.
Cell membrane and ribosomes
B.
Cell wall and mitochondria
C.
Endoplasmic reticulum and ribosomes
D.
Nuclear membrane and DNA
The graph below shows the relative amount of starch in food as the food moves along the alimentary canal.
relative amount of starch
2.
Which of the following structures may be present in prokaryotic cells?
X
distance along the alimentary
canal
Which of the following correctly explains the change in the relative amount of starch in region X?
3.
A.
Amylase is used up before the food reaches region X.
B.
The temperature of region X is not suitable for amylase to work.
C.
The pH of region X is not suitable for amylase to work.
D.
Amylase is killed by proteases in region X.
A student carries out an experiment to test the activity of a certain enzyme.
Which of the following would probably
not result in an increase in the enzymatic activity?
4.
A.
Increase the temperature of the experimental set-up from 20C to 40C.
B.
Adding more substrates but not enzyme.
C.
Adding more enzymes but not substrate.
D.
Placing the substrate and enzyme in a larger container.
Which of the following shows the route of blood in one complete circulation around the body, starting from the leg?
A.
leg → lungs → heart → intestines → leg
B.
leg → lungs → heart → kidneys → leg
C.
leg → heart → lungs → heart → leg
D.
leg → heart → lungs → kidneys → leg
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5.
When blood reaches the air sacs of the lungs, carbon dioxide diffuses from the red blood cells into the air sacs.
How
many layers of cell membranes does carbon dioxide need to pass through before it can be exhaled?
A.
2 layers
B.
3 layers
C.
4 layers
D.
5 layers
Directions:
Questions 6 and 7 refer to the diagram below which shows the consumption of different types of food in
three countries in grammes per head per day.
6.
Which country / countries do the children in the photograph below most probably come from?
A.
country X
B.
country Y
C.
country Z
D.
can be any one of the three countries
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7.
8.
Which country has the highest energy intake per head per day?
A.
country X
B.
country Y
C.
country Z
D.
cannot be determined from the graph
The photograph below shows the transverse section of the human lungs under a high-power microscope.
Based on the information shown in the photograph, which of the following statements correctly explain why the
human lungs can carry out gas exchange efficiently?
9.
(1)
The distance of gas diffusion is short.
(2)
The air sacs provide a large surface area for gas exchange.
(3)
The oxygen which enters the lungs can be carried away rapidly.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
In the diagram below, stages A to D indicate two successive cell cycles.
A
B
C
D
Which of the following statements is incorrect?
A.
The number of cells in stage D is larger than that in stage B.
B.
The quantity of DNA doubles at the end of stage C.
C.
Even distribution of genetic material occurs at stage D.
D.
Stages B and C belong to the same cell cycle.
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10.
The graph below shows how the amounts of four gases change when a person breathes through an air-tight bag.
Which curve does not show the change in the amount of gas correctly?
11.
A.
curve 1
B.
curve 2
C.
curve 3
D.
curve 4
The table below shows the numbers of stomata on the upper and lower epidermis per unit square area of a leaf of three
plant species.
Plant
Upper epidermis
Lower epidermis
X
0
25800
Y
7600
0
Z
0
0
Which of the following combinations correctly identifies the plants?
Plant X
Plant Y
Plant Z
A.
floating plant
submerged plant
terrestrial plant
B.
submerged plant
terrestrial plant
floating plant
C.
terrestrial plant
floating plant
submerged plant
D.
terrestrial plant
submerged plant
floating plant
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12.
13.
14.
In the regulation of blood glucose level, insulin acts as
(1)
a detector of the change in blood glucose level.
(2)
an effector.
(3)
a messenger sent from the endocrine gland to the effector.
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
Which of the following pairs of diseases have a similar way of transmission?
A.
Dengue fever and malaria
B.
AIDS and SARS
C.
Cholera and hepatitis B
D.
Gastroenteritis and tuberculosis
The table below shows the number of organisms of species W, X, Y and Z in an ecosystem and the average dry mass
per organism.
The feeding relationship of these four species can be represented by a single food chain.
Species
Number of organisms
Average dry mass per organism (g)
W
10
3
X
4000
1
Y
100 000
0.003
Z
1000
40
Which of the above species are likely a producer, a herbivore and a carnivore?
15.
Producer
Herbivore
Carnivore
A.
Y
W
X
B.
Y
X
Z
C.
Z
X
W
D.
Z
Y
X
A student prepared a slide of blood cells and observed it under the microscope.
All the blood cells swelled and burst.
Which of the following was a possible cause of the bursting of cells?
A.
Salty water was used as the mountant.
B.
Dead cells were used to prepare the slide.
C.
Distilled water was used as the mountant.
D.
The cover slip was lowered to the specimen too rapidly.
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16.
The diagram below shows a molecule involved in body defence.
Which of the following statements about this molecule is incorrect?
A.
It can activate killer T cells to carry out phagocytosis.
B.
It is a protein molecule.
C.
It is produced by a plasma cell.
D.
It can bind to a specific antigen.
Directions:
17.
Questions 17 and 18 refer to the diagram below which shows a reflex arc in the spinal cord.
Which of the following statements about the reflex arc is incorrect?
A.
Structure 2 is a synapse in the CNS.
B.
Structure 1 is a motor nerve.
C.
M is an effector.
D.
Interneurone is involved in this reflex arc.
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18.
19.
Which of the following statements about the structures in the location labelled 2 are correct?
(1)
Chemical messenger is secreted from the axon in structure 2.
(2)
The structures ensure a unidirectional transmission of nerve impulses.
(3)
It speeds up the transmission of nerve impulses.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
In humans, the eye colour is controlled by a pair of alleles.
blue eyes (b).
The allele for brown eyes (B) is dominant to the allele for
The pedigree below shows the inheritance of eye colour in a family.
What are the genotypes of individuals 2, 3 and 6?
Individual 2
20.
Individual 3
Individual 6
A.
BB
Bb
BB
B.
BB
bb
Bb
C.
Bb
bb
Bb
D.
Bb
bb
BB
The fossil record is usually incomplete because
(1)
not all fossils have been found.
(2)
some fossils are broken down into very fine pieces.
(3)
some life forms left no fossils.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
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21.
Which of the following food chains / webs does the hawk obtain the largest amount of energy?
A. A
grass
B. B
grass
bird
rat
rabbit
hawk
insect
bird
hawk
rat
22.
C. C
grass
insect
frog
snake
D. D
grass
insect
frog
hawk
hawk
Below are three structures present in the male reproductive system.
(1)
vas deferens
(2)
epididymis
(3)
urethra
Which of the following is the correct sequence that a sperm leaves the testis of a man?
23.
A.
(1)  (2)  (3)
B.
(2)  (1)  (3)
C.
(2)  (3)  (1)
D.
(3)  (1)  (2)
Which of the following statements about active transport are correct?
(1)
It allows transportation of sucrose in the stem.
(2)
It enables plants to absorb minerals from the soil.
(3)
It enables the small intestine to absorb glucose.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
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24.
The result of profiling various DNA samples in a criminal investigation is shown below.
Key:
1
2
3
4
5
1
2
3
4
blood sample of victim
blood sample of suspect X
blood sample of suspect Y
first sample from forensic
evidence
second sample from forensic
evidence
5
Which of the following could the DNA analyst conclude about the crime?
25.
A.
Only suspect X was involved.
B.
Only suspect Y was involved.
C.
Suspects X and Y were both involved.
D.
Neither suspect X nor Y was involved.
The photograph below shows a daffodil plant.
X
Which of the following statements about structure X is/are correct?
(1)
It is a rhizome.
(2)
It stores a lot of food.
(3)
It contains buds and seeds.
A.
(2) only
B.
(3) only
C.
(1) and (2) only
D.
(1) and (3) only
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26.
The diagram below shows a vertical section of a flower.
P
Q
R
S
Meiotic cell division takes place in structure(s)
27.
A.
R only.
B.
P and Q only.
C.
Q and R only.
D.
P, Q, R and S.
A student put a germinating seed into a blue dye.
The dye decolourizes in tissues that carry out respiration actively.
Which of the following correctly shows the colour of the dye in different parts of the seed?
28.
Radicle
Plumule
Cotyledons
A.
colourless
colourless
colourless
B.
colourless
colourless
blue
C.
blue
blue
colourless
D.
blue
colourless
blue
What is/are the function(s) of ligaments in the elbow joint?
(1)
To transmit the force exerted by the lower arm to the upper arm.
(2)
To hold the bones of the upper arm and lower arm in position.
(3)
To reduce friction between the bones of the upper arm and lower arm.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
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29.
The base sequence on a part of the template strand of a gene is shown below.
… TA C A G T C A G T G C … .
direction of transcription
During transcription, one base has been deleted from the sequence.
shorter than the normal one.
This results in a polypeptide which is much
Given that UAA, UAG and UGA are stop codons, which base in the above sequence
has most probably been deleted during transcription?
30.
31.
A.
the third base C
B.
the fifth base G
C.
the seventh base C
D.
the ninth base G
Which of the following is/are the common substance(s) formed in the Krebs cycle and alcoholic fermentation?
(1)
ATP
(2)
NADH
(3)
carbon dioxide
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
The flowchart below shows the response of our immune system after a pathogen has entered our body.
activates
activates
pathogen
cell X
multiplies and
proteins
differentiates
produces
which cause
into
cell Y
cell Z
agglutination
of pathogen
What are cells X and Z?
cell X
cell Z
A.
plasma cell
phagocyte
B.
killer T cell
plasma cell
C.
helper T cell
killer T cell
D.
helper T cell
plasma cell
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32.
A girl broke a glass and cut her arm.
Which of the following events occurred at the wound to protect her from
diseases?
A.
Capillaries near the wound dilated.
B.
Fibrinogen trapped blood cells to seal the wound.
C.
Permeability of capillaries decreased.
D.
Blood flow to the wound increased.
Directions:
Questions 33 and 34 refer to the diagram below which shows a metabolic pathway in an eukaryotic cell.
pyruvate
acetyl-CoA
molecule X
cycle A
molecule Z
substance T
reduced form of T
CO2
molecule Y
33.
34.
Where does cycle A take place in the cell?
A.
matrix in mitochondria
B.
cytoplasm
C.
chloroplasts
D.
inner membrane of mitochondria
Substance T is
A.
ATP.
B.
NAD.
C.
NADP.
D.
FADH.
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35.
Which of the following disproves Lamarck’s theory of evolution?
A.
Giraffes have a long neck to feed on taller trees.
B.
Tortoises on different islands have shells of different shapes.
C.
Repeated use of a particular insecticide leads to an increase in the population of mosquitoes resistant to
the insecticide.
D.
36.
Mice with the tails cut away in consecutive generations give birth to offspring with tails.
The pedigree below shows the inheritance of a characteristic in a family.
The characteristic is controlled by a pair of
alleles on an autosome.
Key:
1
2
male with character X
female with character X
3
4
male with character Y
5
female with character Y
Which individual(s) must be heterozygous for the characteristic?
A.
5 only
B.
1 and 2 only
C.
3 and 4 only
D.
1, 2 and 5 only
END OF SECTION A
Go on to Question-Answer Book B for questions on Section B
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