NAMIBIA SENIOR SECONDARY CERTIFICATE
BIOLOGY ORDINARY LEVEL
4322/1
PAPER 1 Multiple Choice
1 hour
Marks 40
2012
Additional Materials: Multiple choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
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INSTRUCTIONS AND INFORMATION TO CANDIDATES
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Make sure that you receive the multiple choice answer sheet with your Candidate Number on it.
Write in soft pencil.
Answer all questions.
There are forty questions on this paper.
For each question, there are four possible answers A, B, C and D. Choose the one you consider
correct and record your choice in soft pencil on the separate answer sheet.
If you want to change an answer, thoroughly erase the one you wish to delete.
•
Read the instructions on the answer sheet carefully.
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Each correct answer will score one mark.
Any rough working should be done in this booklet.
All questions in this paper carry equal marks.
You may use a non-programmable calculator.
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This document consists of 18 printed pages and 2 blank pages.
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Republic of Namibia
MINISTRY OF EDUCATION
© MoE/DNEA
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2
1
The diagram shows a tank containing fish and water plants.
Which characteristic of living organisms is carried out by the fish to produce a gas
essential for the water plants to produce carbohydrate?
2
A
excretion
B
movement
C
nutrition
D
respiration
Tigers and wolves share the same levels of classification until they are placed into
different families.
Which levels of classification are identical for tigers and wolves?
A
B
C
D
levels of classification
class
genus
species
kingdom
order
class
order
class
genus
order
class
species
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3
3
The diagrams show a flower, a leaf and root system of a flowering plant.
1
3
2
Which of these three plant structures belong to dicotyledonous plants?
4
5
A
1, 2 and 3
B
1 and 2 only
C
1 and 3 only
D
2 and 3 only
A microscope has four objective lenses, 4X, 10X, 40X and 100X.
Which objective lens must be in place when you remove a slide or place a new
slide on the stage of a microscope?
A
4X
B
10X
C
40X
D
100X
The diagram shows a group of muscle cells from the wall of the intestine. A
student has labelled the different parts of cells.
nucleus
chloroplasts
cytoplasm
cell membrane
Which label is incorrect?
A
cell membrane
B
chloroplasts
C
cytoplasm
D
nucleus
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6
7
8
Which correctly matches a cell structure (organelle) with its function?
A
cell wall – selectively permeable
B
mitochondrion – photosynthesis
C
nucleus – cell respiration
D
vacuole – storage
Of which organ system is the diaphragm a part?
A
circulatory
B
digestive
C
nervous
D
respiratory
Nitrates are important minerals for plant growth. They are absorbed into root hair cells
by active transport.
Which shows the conditions necessary for active transport to occur?
9
concentration of
nitrates in soil
concentration of
nitrates in root
hair cells
energy required
A
high
low
yes
B
high
low
no
C
low
high
yes
D
low
high
no
Which sequence most correctly represents the results of a reaction involving an
enzyme?
Key:
E
P¹
P²
S
-
A
E + S = P1 + P2
B
P1 + P2 + E = S
C
P2 + E = S + P1
D
S + P¹ = P2 + E
enzyme
product one
product two
substrate
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5
10 A class of students carried out an experiment on four different fruit juices to test
for the vitamin C content of each juice. The blue dye DCPIP can be used because
the vitamin C in fruit juice makes the blue colour disappear.
fruit juice
1 cm3 blue DCPIP solution
The average number of drops for each fruit juice is shown in the table.
Which fruit juice contained most vitamin C?
average number of drops which
decolourised 1 cm³ of DCPIP
solution
A
B
C
D
33
14
9
5
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6
11 The flow diagram shows what happens to the main food nutrients in the human body.
fat
X
protein
fatty acids
blood sugar
Y
fat
storage
glycogen
storage
structural
proteins
Z
What are X, Y and Z?
A
B
C
D
X
amino acids
carbohydrate
carbohydrate
energy
Y
carbohydrate
energy
amino acids
amino acids
Z
energy
amino acids
energy
carbohydrate
12 Which substances do plants need to begin the process of photosynthesis?
A
carbon dioxide and water
B
oxygen and carbon dioxide
C
sugar and oxygen
D
water and sugar
13 The diagram shows a cross-section of a part of a plant. The arrow represents
transpiration.
4
3
1
2
What are cells 1, 2, 3 and 4?
A
B
C
D
1
epidermal
epidermal
guard
guard
2
guard
palisade
epidermal
epidermal
3
palisade
spongy
palisade
spongy
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4
phloem
xylem
phloem
xylem
7
14 Which pair correctly shows a digestive juice and the area of the alimentary canal
where it is produced?
A
bile – gall bladder
B
gastric juice – stomach
C
intestinal juice – pancreas
D
saliva – duodenum
15 The diagram shows a diagrammatic representation of the human alimentary canal.
In which part are villi found?
C
B
A
D
ingestion
egestion
16 The diagram represents the human blood circulatory system.
Which letter shows the pulmonary vein?
lungs
A
D
B
heart
C
Key:
direction in which blood flows
tissues in
rest of body
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17 The diagram shows part of the circulation in mammalian tissue. The central part
is enlarged to show a capillary V, a cell supplied by the capillary, and a vessel X.
artery
vein
arteriole
cell
V
W
X
Which body fluids are found at V, W and X?
A
B
C
D
body fluids
V
W
X
lymph
plasma
tissue fluid
plasma
lymph
tissue fluid
plasma
tissue fluid
lymph
tissue fluid
lymph
plasma
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9
18 The diagram shows a section through a small surface wound to the skin.
bacteria
scab
beginning
to form
A
epidermis
epidermis
B
C
D
Which letter shows a neutrophil carrying out phagocytosis?
19 Which cell is capable of carrying out the following process:
glucose → alcohol + carbon dioxide
A
cheek
B
mesophyll
C
muscle
D
yeast
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20 The bar graph shows the percentage of deaths due to smoking for five different diseases.
100
Key
males
90
females
80
70
percentage of
all deaths from 60
each disease
due to smoking 50
40
30
20
10
0
lung
respiratory
cancer disease
heart
disease
stroke
stomach
ulcers
disease
What percentage of deaths from respiratory disease in males is due to causes
other than smoking?
A
12
B
24
C
76
D
88
21 Which sequence correctly traces the path of urine after it leaves the kidneys?
A
ureters→urinary bladder→urethra
B
urethra→urinary bladder→ureters
C
urinary bladder→ureters→urethra
D
urinary bladder→urethra→ureters
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11
22 The diagram shows a germinating seed.
1
2
3
4
At which numbers is auxin produced?
A
1 and 2
B
2 and 3
C
3 and 4
D
4 and 1
23 An insect flies into an eye of a boy. The boy blinks his eyes very quickly.
Which is the effector in this action?
A
blinking of the eyes
B
cone cells in the eye
C
insect flying into the eye
D
muscles in the eyelid
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24 The eye can focus on objects at different distances using the ciliary body to change the
thickness of the lens.
Which is correct when the lens is thickest?
A
B
C
D
muscles in ciliary body
contracted
relaxed
contracted
relaxed
distance of object from eye
far
far
near
near
25 The graph illustrates the air temperature and body temperature of a human during
one day.
body temperature
of human
40
30
temperature/oC
20
10
0
6:00
12:00
18:00
24:00
time
Human body temperature can be controlled by the following processes:
1 vasoconstriction
2 sweating
3 evaporation
Which processes would probably occur in the human between 12:00 and 18:00 hours?
A
1, 2 and 3
B
1 and 2 only
C
1 and 3 only
D
2 and 3 only
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13
26 The diagram shows how pigs are cloned.
A
adult male
D
B
C
adult female
cloned animal
cloned animal
Which cell is haploid?
27 The diagram shows a cow and her calf.
The colour and the pattern of the skin of the calf are known as 1, the information for coat
colour is stored in parts of chromosomes called 2, and this information is passed from the
cow to the calf in cells called 3.
What are 1, 2 and 3?
A
B
C
D
1
characteristics
variation
characteristics
selection
2
genes
genes
gametes
alleles
3
gametes
zygotes
embryos
gametes
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28 The following five processes occur during sexual reproduction in a flowering plant.
1.
The male nucleus fuses with the female nucleus.
2.
The pollen grain lands on the stigma.
3.
The male nucleus travels down the pollen tube.
4.
The pollen grain grows a pollen tube.
5.
The male nucleus is released from the pollen tube.
In which order do these processes occur?
first
A
B
C
D
2
2
3
4
last
3
4
5
2
4
3
1
5
5
5
4
3
1
1
2
1
29 New plants can be produced from adult plants in a variety of ways. The diagram
shows three of these ways.
2
1
3
Which is correct?
A
B
C
D
1
asexual
sexual
asexual
sexual
2
asexual
asexual
sexual
sexual
3
sexual
sexual
asexual
asexual
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30 The diagram shows a fetus developing in a uterus.
Which part produces amniotic fluid?
B
A
C
D
31 Which method of birth control (contraception) does not normally prevent
fertilisation (conception)?
A
condom
B
diaphragm
C
IUD
D
vasectomy
32 Individuals with HIV/AIDS are more vulnerable to and sometimes contract
tuberculosis (TB) that is rare in the rest of the population.
Which reason explains this?
A
People with HIV/AIDS are more often exposed to these TB-causing pathogens.
B
People with HIV/AIDS are unable to fight these TB-causing pathogens.
C
People with HIV/AIDS release substances that attract the TB-causing pathogens.
D
People with HIV/AIDS release substances that increase the strength of the TBcausing pathogens.
33 In a certain breed of dog, deafness is due to a recessive allele d of a particular
gene, and normal hearing is due to its dominant allele D.
What percentage of the offspring of a normal heterozygous Dd dog and a deaf
dog dd would be expected to have normal hearing?
A
0%
B
25 %
C
50 %
D
75 %
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34 What is the idea that plants and animals have changed over millions of years, called?
A
adaptation
B
evolution
C
mutation
D
selection
35 The following four organisms are found at the Avis dam near Windhoek.
•
the primary producer is a green alga, Spirogyra;
•
the primary consumer is the crustacean, Daphnia;
•
the secondary consumer is a small fish, the blue gill;
•
the tertiary consumer is a larger fish, the smallmouth bass.
Which can be expected in the dam if fishermen catch and remove most of the
smallmouth bass?
A
The blue gill population will probably increase.
B
The Daphnia population will increase.
C
The Spirogyra population will probably decrease.
D
There will be no change in the populations.
36 The diagram shows an ecological pyramid.
lynx
bird
locust
acacia
What is illustrated by this pyramid?
A
height of the living organisms
B
number of the living organisms
C
size of the living organisms
D
weight of the living organisms
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37 The diagram shows part of the carbon cycle.
Which letter represents respiration?
carbon dioxide in
the atmosphere
A
D
plants
dead plants
and animals
B
animals
C
microorganisms
38 The graph illustrates the population growth curve (sigmoid growth curve) of a
group of springbok.
During which stage will the springbok acclimatise and adapt to the environment?
B
A
C
D
population size
time
39 What makes nuclear fall-out dangerous to living organisms?
A
it causes acid rain
B
it causes global warming
C
it damages genetic material
D
it damages water sources
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40 The over-use of fertilisers by farmers can harm the environment.
What will be the effect of nitrates from the fertilisers on rivers?
A
an increase in the growth of algae leading to lack of oxygen
B
an increase in the growth of bacteria causing a decrease in algae growth
C
a decrease in the growth of algae causing an increase in bacteria
D
a decrease in the growth of bacteria leading to a lack of oxygen
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