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NATIONAL
SENIOR CERTIFICATE
GRADE 11
LIFE SCIENCES P1
EXEMPLAR 2013
MARKS: 150
TIME: 2½ hours
This question paper consists of 16 pages
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Copyright reserved
Please turn over
Life Sciences/P1
3
NSC – Grade 11 Exemplar
DBE/2013
SECTION A
QUESTION 1
1
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Choose the correct answer and write only the letter (A to D) next to the question
number (1
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1 to 1
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10) in the ANSWER BOOK, for example 1
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11 D
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1
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1
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A
B
C
D
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3
constricted bronchioles
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a larger surface area
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Which ONE of the following statements is TRUE about the
relationship between a predator and its prey?
A
B
C
D
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4
contains less carbon dioxide
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is drier
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There is interspecific competition
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An increased number of predators leads to an increased
number of prey
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The following are involved in the process of cellular respiration:
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3
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5
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1
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A
B
C
D
Krebs cycle
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light-independent phase
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QUESTIONS 1
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6 and 1
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7 are based on the diagram below showing the
human thorax
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1
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1
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During inhalation it relaxes and during exhalation it contracts
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During inhalation it contracts and during exhalation it is
flattened
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1
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1
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Has cartilage rings that are C-shaped to allow the oesophagus
to stretch during swallowing
3
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1
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1
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3
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Large surface area
Thin surface
Moist surface
Many capillaries
Which of the above are features of an efficient gaseous exchange
surface?
A
B
C
D
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10
1, 2, 3 and 4
1, 2 and 4
1, 3 and 4
2, 3 and 4
Test tubes A and B below were placed in bright light
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O 2 and CO 2 will be produced in test tube B
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CO 2 will be used in test tubes A and B
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2
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NSC – Grade 11 Exemplar
DBE/2013
Give the correct biological term for each of the following descriptions
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2
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1
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1
1
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2
A protective membrane surrounding the lungs
1
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3
The process in plants during which radiant energy is converted into
chemical energy
1
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The inherent ability of a population to increase in size
1
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5
The process of filtering the accumulated waste products of
metabolism from the blood of a patient whose kidneys are not
functioning properly
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6
1
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Write A only, B only, both A and B or none next to the question number
(1
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1 to 1
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6) in the ANSWER BOOK, for example 1
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7 B only
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3
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3
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3
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3
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3
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3
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4
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NSC – Grade 11 Exemplar
DBE/2013
The diagram below represents an alveolus and its blood capillary
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Write only the letter (A to G) next to the question number (1
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1 to 1
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5) in
the ANSWER BOOK, for example 1
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6 H
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4
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4
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4
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4
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4
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5
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NSC – Grade 11 Exemplar
DBE/2013
Choose a term from the list below that matches each of the following
examples of social behaviour
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5
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5
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5
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A
B
C
D
E
F
Resource partitioning
Intraspecific competition
Commensalism
Mutualism
Interspecific competition
Parasitism
1
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1
Peacocks display the large, brightly-coloured feathers of their tails
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5
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1
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3
Vultures and crows feed on the same carcass
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1
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5
Bees visit flowers to get nectar whilst pollen attaches to their
bodies
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1
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Mosquitoes bite and deposit the malaria-causing organism into the
blood of a human
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1
Study the diagram below which shows the human digestive system
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2
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2
(4)
Write the LETTER only of the part:
(a) That stores bile
(b) Where chemical digestion of protein begins
(1)
(c) Where most water and mineral salts are absorbed
Copyright reserved
(1)
(1)
(7)
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Life Sciences/P1
2
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The
rate at which bubbles of gas are produced can be used to measure the rate of
photosynthesis
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• The pondweed was exposed to one colour of light and left for 5 minutes
before measurements were taken
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• The procedure was repeated using light of a different colour of equal
intensity
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Bubbles
of gas
Pondweed
The results are shown in the table below
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2
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2
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2
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2
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Show all working
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(2)
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Life Sciences/P1
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5
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NSC – Grade 11 Exemplar
DBE/2013
Explain why the apparatus is left for 5 minutes under each colour of
light before taking measurements
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(2)
Draw a bar graph of the results shown in the table
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Tabulate THREE differences between aerobic and anaerobic respiration
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Study the diagram below and answer the questions that follow
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(1)
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2
Identify region A and parts B and D
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A
B
C
D
Malpighian body of a human nephron
3
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1
In which region of the kidney would you find this structure?
(1)
3
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2
Name the process in urine formation that occurs in this structure
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2
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(1)
3
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4
Describe TWO structural adaptations of part C for the process in
QUESTION 3
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2 above
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What is the importance of this?
(2)
3
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Name the hormone secreted when there is a shortage of water
in A
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2
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Life Sciences/P1
3
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GRAPH B shows changes in the human population size over a
period of time
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Growth of the human
population
Human population (millions)
A
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3
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1
3
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2
During which period (A, B or C) did natality exceed mortality for
many hours?
(1)
Account for the pattern of growth during Period B
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3
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5
Copyright reserved
In what way is the growth of the human population similar to that of
the bacterial population?
(1)
Explain why it may take the human population longer to reach the
type of growth shown by the bacteria population in Period B
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(2)
(11)
Life Sciences/P1
3
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Age groups in years
8
6
4
2
% females
0
0
2
4
% males
Age Pyramid A
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3
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3
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3
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3
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Age groups in years
6
8
4
2
0
0
2
4
% males
% females
Age Pyramid B
What percentage of the female population is aged between 5 and 9
years in Pyramid A?
(1)
Which age group makes up exactly 5% percent of the male
population in Pyramid A?
(1)
What percentage of the female population are aged 65 to 69 years
in Pyramid B?
(1)
Which group (male or female) has the larger percentage reaching
old age in Pyramid B?
(1)
Which pyramid represents the population distribution of a
developed country?
(1)
Give TWO reasons for your answer to QUESTION 3
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Content:
Synthesis:
(17)
(3)
NOTE: No marks will be awarded for answers in the form of flow charts or diagrams