sc f2 - answers

7/30/2019 Sc F2 - Answers

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ANSWERS

Chapter 1 The World through Our Senses

Paper 1

1 C 2 D 3 B 4 A 5 A 6 D 7 C 8 B 9 B 10 A

11 C 12 C 13 C 14 D 15 D 16 B 17 B 18 A 19 B 20 D

21 B 22 A 23 A 24 C 25 B

Paper 2

1 (a) (i) Helps us to hear(ii) Helps us in balancing our bodies

(b)

(c) (i) He does not hear very well.

(ii) As a person ages, his ossicles fuse together and his eardrum becomes lesselastic.(iii) A hearing aid

2 (a) Light stimulus

(b)

(c) (i) The pupil is big in dark places and becomes smaller in bright places.

(ii) The ciliary muscles relax to make the lens thin to look at distant objects. Fornear objects, the ciliary muscles contract and the lens become thick.

Pearson Malaysia Sdn Bhd 2007 Super Score Science Form 2


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3 (a) The sense of touch

(b) To determine the sensitivity of the skin on different parts of the body

(c) The fewer guesses needed, the easier it was to identify the objects.

(d) No, only the sense of touch

(e) It was the easiest to identify the objects when the fingertip were used, ascompared to the forearm and back of hand.

(f) (i) There are more receptors in the fingertip

(ii) The fingertip has thinner epidermis

(g) (i) Heat receptors

(ii) Pain receptors

4 (a) The aim of the activity was to determine the response of plants to light and waterstimuli.

(b) Visking tubing material

(c)

(d) (i) shoots

(ii) positive phototropism

(e) (i) roots

(ii) positive hydrotropism

(f) Tropism responses enable a plant to obtain the resources needed to sustain its life.



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Chapter 2 Nutrition

Paper 1

1 A 2 C 3 B 4 D 5 B 6 D 7 C 8 B 9 C 10 A

11 B 12 C 13 B 14 D 15 C 16 B 17 C 18 B 19 B 20 D21 A 22 A 23 C 24 C 25 A

Paper 2

1 (a) (i) To grow

(ii) For energy to carry out our daily activities

(b) (i) Vitamin K

(ii) Broccoli

(c) (i) Glucose(ii) Benedicts reagent

(iii) Orange-red precipitate

2 (a)

(b) (i) Food is broken into smaller bits by the teeth

(ii) Starch is converted to maltose

(c) Peptones

(d) Our stomach secretes acid. If we skip a meal, our stomach will become too acidic

and we may develop ulcers.

3 (a) (i) They are both part of the human digestive system

(ii) Food moves along the organs by peristalsis

(b) (i) To absorb digested food

(ii) To reabsorb water and form faeces



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(c) The small intestine,P

(d) Nutrients need to be absorbed through the villi of the small intestine

(e) Digested food will not be absorbed properly and he will feel weak

(f) Very watery faeces will be produced

4 (a) (i) Carbohydrate, proteins, fats, mineral salts and water

(ii) Carbohydrate, proteins, fats, mineral salts, vitamins, dietary fibre and water

(b) Dietary fibre and vitamins

(c) (i) Age(ii) Gender

(iii) Physical activity(iv) Body size

(d) 8 000 kJ



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Bodytemperature(oC)

Surrounding temperature (oC)

J

K

Chapter 3 Variety of Living Things

Paper 1

1 D 2 A 3 C 4 B 5 A 6 C 7 D 8 D 9 B 10 D

11 A 12 D 13 B 14 D 15 D

Paper 2

1 (a) There are so many organisms, so putting them into smaller groups makes it easier

to study them.

(b) (i) Plants

(ii) Animals

(c) (i) They have different finger prints

(ii) They have different likes and dislikes(accept any other reasonable answers)

2 (a) (i) Animals (vi) gorillas

(ii) Vertebrates (vii) mosquitoes

(iii) Invertebrates (viii) scorpions

(iv) bears (ix) clams(v) giraffes

(b) Warm-blooded animals have constant body temperatures. The body temperaturesof cold-blooded animals vary according to the temperature of the surroundings.

(c)

(d) (i) dry scales(ii) wet scales

(iii) feathers

(iv) fur

(e) (i) Body covering

(ii) It is a visible feature that is easily and accurately determined



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Chapter 4 Interdependence among Living Organisms and the Environment

Paper 1

1 C 2 C 3 B 4 D 5 A 6 B 7 C 8 C 9 D 10 B

11 C 12 C 13 B 14 B 15 A 16 D 17 B 18 C 19 D 20 C

21 A 22 B 23 A 24 C 25 D

Paper 2

1 (a) 5

(b) (i) Paddy rat owl

(ii) Paddy rat snake eagle(iii) Paddy rat eagle

(iv) Paddy grasshopper frog owl(v) Paddy grasshopper frog snake eagle

(c) (i) All the food chains start with paddy(ii) Energy is transferred at each stage of a food chain

(d) (i) The grasshopper population will increase because there are no frogs to eat

them(ii) The rat population will decrease because the owls and the snakes will be

eating them

2 (a) A rainforest

(b) (i) A group of similar organisms that breed among themselves to produce

offspring

(ii) The number of organisms of the same species that live together in a habitat

(iii) Populations of different organisms in a habitat that interact with each other(iv) All organisms in an area that interact with each other and also with the non-

living components of that area

(c) (i) Monkeys eat fruits and leaves

(ii) Lizards eat insects

(iii) Plants use sunlight to carry out photosynthesis(accept students answers)



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3 (a)

(b) (i) The type of plant(ii) The absence or presence of carbon dioxide

(iii) Whether starch is present in the leaves

(c) (i) Iodine

(ii) Alcohol

(d) (i) Place the plants in a dark cupboard for two days and water them sufficiently.(ii) To ensure that the plants use up all its stored starch.

(e) (i) To soften the cells and burst the cells(ii) To remove chlorophyll

(f) (i) It releases oxygen which is needed by all organisms to respire.(ii) It produces food for green plants. Green plants in turn, are food for animals,

either directly or indirectly.

4 (a) Predator-prey

(b) (i) Negatively affected, eaten by organismN(ii) Positively affected, eats organismM

(c)


Time

Number

OrganismM

OrganismN


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(d) (i) Herbivorous

(ii) Carnivorous

(e) (i) The initial number of organisms

(ii) The length of time of the experiment

(f) For biological control use to control the pest population

(g) (i) It does not pollute the environment

(ii) It targets the specific pest organism



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Chapter 5 Water and Solution

Paper 1

1 D 2 B 3 C 4 C 5 A 6 D 7 D 8 B 9 C 10 B

11 C 12 A 13 C 14 B 15 D 16 C 17 A 18 C 19 B 20 B

21 B 22 D 23 A 24 C 25 B

Paper 2

1 (a) The water is polluted

(b) (i) Oil spills from ships

(ii) Illegal or improper desludging of ships

(c) The fish and shell fish caught would be contaminated and unsafe for humanconsumption

(d) (i) Enforce anti-pollution laws strictly(ii) Fine those who do not obey the laws

2 (a) (i) Coagulation(ii) Coagulation enables small particles to coagulate and become big particles

(iii) Alum and slaked lime

(b)

(c) (i) To kill microorganisms(ii) To reduce tooth decay

(d) Using ozone

3 (a) (i) The volume of non-aqueous solvent



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Chapter 6 Air Pressure

Paper 1

1 C 2 B 3 B 4 C 5 C 6 C 7 A 8 B 9 B 10 B

11 C 12 A 13 D 14 C 15 C

Paper 2

1 (a) The fluid in our bodies exerts an equal and opposite pressure

(b) As the aeroplane climbed higher, the air pressure dropped. The air pressure inside

his ears was higher than the air pressure outside. This imbalance in pressure

caused the pain.

(c) The Eustachian tube

2 (a) A siphon

(b) To transfer water from a high position to a lower position

(c) To find out if the length of the tube affects the transfer of water

(d) (i) Amount of water, difference in heights of the tanks

(ii) Length of tube(iii) Whether water flows into the lower tank or not

(e) Suck on the end of the tube to lower the air pressure in the tube

(f) Changing the dirty water in an aquarium

(g) (i) Water would not flow(ii) There is no difference in atmospheric pressure between the two tanks



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Chapter 7 Dynamics

Paper 1

1 D 2 C 3 A 4 D 5 C 6 B 7 C 8 D 9 B 10 C

11 C 12 D 13 A 14 C 15 B 16 C 17 B 18 A 19 B 20 B

21 D 22 C 23 A 24 A 25 C

Paper 2

1 (a) (i) Pulling force

(ii) Pushing force

(iii) Magnetic force

(iv) Gravitational force

(b) Newton

2 (a) (i) 500 x 8 = 4000 J

(b) (i) No work was done

(ii) The sack did not move

(c) (65 + 50) x 10 x 3 = 3 450 J

(d) 3 450 J = 11.5 W

(5 x 60) s

3 (a) To measure force using the extension of a spring

(b) (i) 4 cm

(ii) 10 cm

(c) Hookes Law

(d) A spring balance

(e) (i) the diameter of the spring

(ii) length of the spring(iii) the extension of the spring

(f) The shorter spring extends less than the longer spring for the same load



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4 (a) Frictional force

(b) (i) Weight (number of blocks)(ii) The roughness of the surface in contact

(c) (i) The contact area of the aluminium block

(ii) Weight of the blocks/the nature of the contact surface(iii) The magnitude of the force required to move the block or blocks

(d) (i) The heavier the aluminium blocks, the bigger the friction generated and the

bigger the force is required to move the blocks(ii) The rougher the surface, the bigger the friction generated and the bigger the

force required to move the blocks

(e) (i) Friction wears out touching surfaces(ii) Friction produces unwanted heat and wastes energy

(f) (i) Friction between the road and the tyres wears out the treads on the tyres

(ii) Tyres with bald treads must be replaced



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Chapter 8 Support and Movement

Paper 1

1 C 2 D 3 A 4 B 5 C 6 C 7 A 8 B 9 A 10 C

11 C 12 D 13 D 14 C 15 A

Paper 2

1 (a) (i) Hydrostatic skeleton(ii) Endoskeleton

(iii) Exoskeleton

(b) (i) Cell turgidity(ii) Tendrils

(iii) Clasping roots

2 (a) (i) Length and size affects the strength of rods and tubes.

(b) (i) (ii) solid

solid

hollow

(c) (i) Solid bone(ii) Hollow bone

(d) (i) The diameter of the rod and tube and the length of the rod and tube

(ii) Whether the rod was solid or hollow(iii) The total weight which broke the rod or tube

(e) The hollow wooden tube can support heavier weights as compared to the solidwooden rod

(f) A hollow wooden tube is stronger than a solid wooden rod

(g) Most vertebrates have hollow bones instead of solid bones because these bones

are lighter and stronger



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Chapter 9 Stability

Paper 1

1 D 2 B 3 D 4 C 5 B 6 D 7 A 8 D 9 B 10 B

11 B 12 A 13 C 14 B 15 A

Paper 2

1 (a) He is lifting weights

(b) He has to lift the weights above his shoulders. This makes him unsteady.

(c) By spreading his legs wide apart to increase his base area

(d) To have a better grip on the bar of the weights.

2 (a) The heavier the object, the more stable the object is.

(b) (i) The amount of substance in each beaker

(ii) The size of the beakers

(c) (i) The weight of the contents of the beakers

(ii) The stability of the beakers (the angle of the board at which each beaker

topples)

(d) M,N, O

(e) Heavier objects are more stable than lighter objects

(f)

(g) The glass bottle is more stable than the plastic bottle because it is heavier


Weight of object

Stabilityofobject


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Chapter 10 Simple Machines

Paper 1

1 C 2 A 3 A 4 C 5 B 6 B 7 B 8 C 9 A 10 B

11 D 12 C 13 D 14 A 15 C

Paper 2

1 (a)(i) (ii) (iii)

(b) (i) First class lever

(ii) Second class lever(iii) Third class lever

2 (a) Lever J, because the fulcrum is in the middle of the two forces,

(b) (i) 14 x 15 = 5 xM

14 x 15 = M5

M = 42 N

(ii) 14 x 15 = Nx 20

14 x 15 = N

20 N = 10.5 N

(c) (i) Both have a load of 14 N acting 15 cm away from the fulcrum

(ii) Both are 20 cm long

(d) (i) MandNare of different magnitudes

(ii) The positions of the fulcrum in both levers are different

(e) (i) A see-saw

(ii) Pliers (accept any other reasonable answers)

(f) The product of the load with the load distance from the fulcrum is equal to the

product of the effort with the effort distance from the fulcrum when the lever is in

equilibrium.


sc f2 - answers

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