Life Sciences P1/Grade 12
2
FUNDA
INSTRUCTIONS AND INFORMATION
Read the following instructions carefully before answering the questions.
1.
Answer ALL the questions.
2.
Write ALL the answers in the ANSWER BOOK.
3.
Start the answer to EACH question at the top of a NEW page.
4.
Number the answers correctly according to the numbering system used in this
question paper.
5.
Present your answers according to the instructions of each question.
6.
Do ALL drawings in pencil and label them in blue or black ink.
7.
Draw diagrams, tables or flow charts only when asked to do so.
8.
The diagrams in this question paper are NOT necessarily all drawn to scale.
9.
Do NOT use graph paper.
10.
You must use a non-programmable calculator, protractor and a compass,
where necessary.
11.
Write neatly and legibly.
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Life Sciences P1/Grade 12
3
FUNDA
SECTION A
QUESTION 1
1.1 Various options are provided as possible answers to the following questions.
Choose the correct answer and write only the letter (A to D) next to the question
number (1.1.1 to 1.1.10) in your ANSWER BOOK, for example 1.1.11 D.
1.1.1 The photoreceptors stimulated by dim light:
A Lens and rods
B Rods and cones
C Cones only
D Rods only
1.1.2 The shape of the lens in the human eye may be altered by the contraction or relaxing of
the….
A optic nerve
B muscles of the iris
C muscles of the ciliary body
D pupil
1.1.3 The tough, non-elastic tissue covering the outer portion of the eyeball is the ….
A choroid
B sclera
C conjunctiva
D iris
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Life Sciences P1/Grade 12
4
FUNDA
QUESTIONS 1.1.4 TO 1.1.6 ARE BASED ON THE DIAGRAM OF THE HUMAN EAR
BELOW.
1.1.4 Which part is responsible for amplification of vibrations?
4
A1
B2
C3
D4
1.1.5 When the Eustachian tube is blocked, it is treated by inserting grommets into part …
A1
B2
C3
D4
1.1.6 Which structures in part 1 are stimulated by changes in the
movement?
direction and speed of
A Utriculus
B Cristae
C Sacculus
C Maculae
1.1.7 The function of the pinna is to …
A amplify sound waves.
B keep the tympanic membrane moist.
C direct sound waves to the tympanic membrane.
D convert sound waves into mechanical vibrations
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Life Sciences P1/Grade 12
5
FUNDA
1.1.8 When the tension of the suspensory ligaments in the human eye is slackened, the….
A lens becomes less convex
B eye is focused for distant vision
C pupil enlarges
D lens bulges
1.1.9
1.1.10
1.2 Give the correct biological term for each of the following descriptions. Write only the
term next to the question number (1.2.1 to 1.2.9) in the ANSWER
BOOK.
1.2.1 Specialized structures in the inner ear containing sensory cells
1.2.2 The part of the autonomic nervous system that prepares the body for an
emergency
1.2.3 A disease that is characterized by a loss of the myelin sheath of neurons
in the brain
1.2.4 A change in the internal or external environment that will be detected by a
receptor and converted into an impulse
1.2.5 That part of the nervous system which consists of cranial and spinal
nerves
1.2.6 The use of the natural enemy of a pest to control the population size of that
pest
1.2.7
1.2.8
1.2.9
(9 x 1) (9)
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Life Sciences P1/Grade 12
6
FUNDA
1.3 Indicate whether each of the descriptions in COLUMN I applies to A
ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN II.
Write A only, B only, both A and B or none, next to the question number
(1.3.1 to 1.3.5) in the ANSWER BOOK.
COLUMN I
COLUMN II
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
(5 x 2) (10)
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Life Sciences P1/Grade 12
1.4
7
FUNDA
The diagram below shows a longitudinal section of the human brain.
1.4.1 Give labels for parts A and B.
(2)
1.4.2 Give the LETTER and the NAME of the part that:
(a) Is stimulated when the carbon dioxide level in the blood is too high.(2)
(b) Is responsible for coordination of voluntary actions
(2)
(6)
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Life Sciences P1/Grade 12
1.5
8
FUNDA
The diagrams below represent a part of the human ear and a part of the human central
nervous system
C
B
D
E
F
A
G
Structure of a part of the human ear and a part
of the human central nervous system
1.5.1 Write down the LETTER of the part of the brain / ear that ...
(a) controls breathing.
(b) balances air pressure between the outer and inner ear.
1.5.2
Give ONE function of the parts labelled ...
(a)
(b)
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C.
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Life Sciences P1/Grade 12
1.5.3
(a)
9
FUNDA
Name the endocrine gland found at the base of the brain labelled G.
(b)
Name the hormone that this endocrine gland secretes, mentioned in QUESTION
1.5.3.(a), which changes the empty Graafian follicle to a yellow mass tissue.
1.6 The diagram below represents an action that takes place in the human body.
neuron C
1.6.1
Provide the diagram with a heading.
(1)
1.6.2
Identify neurons A, B and C.
(3)
1.6.3
Name the microscopic gap between neuron A and neuron C.
(1)
(5)
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Life Sciences P1/Grade 12
10
FUNDA
QUESTION 3
3.1
Study the diagram of a longitudinal section through a human eye below.
3.1.1
Label parts A, B and E.
(3)
3.1.2
State ONE function of part D.
(1)
3.1.3
Describe the mechanism that causes part C to become smaller.
(2)
3.1.4
State the significance of the mechanism described in
QUESTION 3.1.3.
(2)
3.1.5
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Describe accommodation in the eye for distant vision.
(4)
(12)
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Life Sciences P1/Grade 12
3.2
11
FUNDA
Study the following diagram of the eye.
A
B
C
D
J
I
H
G
G
F
F
E
3.2.1
3.2.2
3.2.3
3.3
3.3.1
Write the LETTER and the NAME of the region where the clearest image is
formed.
(2)
Name the parts in the correct sequence through which light passes in order
to reach structure H. (Mention the letter from the diagram and the name of
each structure in your answer.)
(3)
Describe the change that occurs in the structures labelled E, G and J when
focusing on a bird that is flying off into the distance.
Define a negative feedback mechanism.
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(7)
(12)
(2)
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Life Sciences P1/Grade 12
3.3.2
12
FUNDA
Describe how the human body restores thyroxin concentration in the blood
when it rises above normal levels.
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(5)
(7)
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