sc form2 paper2

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)

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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)

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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.

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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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