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SECTION A
(40 marks)
Answer all questions.
1. a) Match the following.
i) Mammals • • Internal fertilisations
ii) Fish • • Warm blooded
iii) Birds • • Slimy scales
b) Identify the invertebrates by putting a tick(√) in the appropriate boxes.
i. Ant
ii. Crab
iii. Shark
iv. Earthworm
v. Frog
(8 marks)
2. Match the organic solvents and the substances they can dissolve.
i) Alcohol • • Cosmetic substances
ii) Chloroform • • Varnish, ink
iii) Acetone • • Paint, grease
iv) Kerosene • • Plastic
(4 marks)
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3. a) Name the types of stimuli responded by the four plants below.
P : _______________________________________
Q : _______________________________________
R : _______________________________________
S : _______________________________________
b) The following figure shows a cross section of human ear. Name the labeled parts.
(9 marks)
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Fototropism Seismonasty Thigmotropism hydrotropism
Cochlea Ossicles NerveEar canal Semicircular canals
P
4. The diagram below shows a food web in a paddy field.
a) In the diagram, label the organism using the following words.
i. W : ___________________________________
ii. X : ___________________________________
iii. Y : ___________________________________
iv. Z : ___________________________________
b) Give two food chains which form the food web.
i. ___________________________________________________________________
ii. ___________________________________________________________________
c) What is the effect on population of rats, when paddy is harvest?
_______________________________________________________________________
(7 marks)
3
GrasshopperW
Paddy plantZ
Eagle X
SnakeY
Chicken
Rat
Producer Secondary consumerPrimary consumer Tertiary consumer
5. a) Classify the following devices shown below.
i) _________________________________ ii) _________________________________
iii) _______________________________ iv)________________________________
(4 marks)
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First class lever Second class lever Third class lever
b) Label the position of load, fulcrum and force for the device shown below.
i. X : ______________________________
ii. Y : ______________________________
iii. Z : ______________________________
(3 marks)
6. The diagram below show an insecticide spray pump.
a) Mark with the letter ‘P’ the region of low pressure.
b) Show by drawing arrow, the direction in which air pressure is acting on.
c) State two examples of appliances using the principle of air pressure.
i. ______________________________________________
ii. ______________________________________________
(5 marks)
5
Force Load Fulcrum
X
ZY
SECTION B
(20 marks)
7. The figure shows five types of support systems found in plants.
a) Based on your observations, state one characteristic of any four of the support systems
R, S, T, U and V.
i. R : ___________________________________________________________
ii. S : ___________________________________________________________
iii. T : ___________________________________________________________
iv. U : ___________________________________________________________
v. V : ___________________________________________________________
(4 marks)
b) Classify the support systems R, S, T, U and V into two groups based on common
characteristics. Name the support system belonging to each group.
(4 marks)
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R, S, T, U and V
(i) (ii)
(iv)(iii)
Common characteristic
Support system
8 a) The above apparatus is set up to study the effect of contact surface on frictional force.
(i) State two factors that influence frictional force.
a) ___________________________________________________________
b) ___________________________________________________________
(ii) Does contact surface area influence frictional force?
_______________________________________________________________
(3 marks)
b) A student carried out an experiment to investigate the situation encountered by the
worker.
The following figure shows an experiment to determine how the force applied to
turn an object about a pivot depends on distance of the force from the pivot.
7
The following figure shows the readings of the spring balance for three values of L.
Based on the figure, record the force needed to balance the plank for the three different
values of L in the table.
L(cm) Force(N)
i) 50.0
ii) 22.7
iii) 14.7
(3 marks)
c) Based on the data on the table, draw a bar chart to show the force applied by the spring
balance for the different values of L.
(2 marks)
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d) Identify the variables in the experiment.
(i) Manipulated variable:
___________________________________________________________
(ii) Variable that is kept constant:
___________________________________________________________
(iii) Responding variable:
___________________________________________________________
(3 marks)
e) State the class lever for this system.
________________________________________________________________________
(1 mark)
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