Science Prelim Exam Practice 11

Answer Key

1)4
2)1
3)1
4)1
5)2

6)3
7)2
8)4
9)2
10)1

11)2
12)2
13)4
14)3
15)3

16)4
17)1
18)1
19)3
20)2

21)1
22)4
23)3
24)3
25)4

26)2
27)2
28)3
29)1
30)4


(BOOKLET B)

31 a) The coloured oil droplet would move towards the left.
b) The germinating seeds would be absorbing oxygen and the oil droplet would take up this space.

32. a) System A – Digestive System
System B – Circulatory System
b) Gas D – Carbon Dioxide
Process E – Repiration.
c) Cytoplasm

33. a) Method of Reproduction – By Runners (1m).
The young has the same quality as the parent plant. OR
It takes a shorter time to grow.

34. a) Duckweed – A
Amoeba – D
Water hyacinth – B
Mould – E
b) Organism C is a land plant that can make food, bears flows.

35 a) Set-up B. Decomposers are not killed by heat unlike Set up A,
b) The purpose of the limewater is to test for the presence of carbon dioxide which is released when decomposition takes place.
c) Conditions necessary for decomposition:
- Oxygen
- Water
- Suitable temperature,
- Suitable nutrients

36 a) Washington moth
b) It can camouflage itself better against the dark coloured trunks and would not be spotted by predators.

37 a) The further the distance from the town, more types of lichen will be found.
b) 60 mg
c) It kills organisms in lakes. OR
It corrodes metal / wear down statues.


38a) True
b) False
c) Not possible to tell
d) True

39 a) It will move towards Setup B
b) The batteries in Setup B are connected in series so the electromagnet is stronger than Setup A.

40 a) The amount of water must be the same.
b) -
c) Heat is transferred from hot to cold. OR
Heat transfer is faster when the temperature difference is greater.

41 a) Wheel and Axle
b) The wheel of hand drill A is smaller than that of hand drill B, so drill A takes more effort than drill B.

42 a) Gravitational potential energy  Kinetic energy  electrical energy
b) It does not pollute the environment OR
It does not use up fossil fuels which are non-renewable. OR
Water is a renewable resource.

43. a) Gravity / Friction
b) Kinetic energy of the ball was converted by friction and gravity to heat energy, causing it to slow down and come to a rest.

c) Ball’s position - to the right of the original

44 b) The bulb will light up.

45. a) To find out which material is the most absorbent.
b) Cardboard

c) It absorbs the least water as compared to the rest

46 a) Food Y
b) The increase in temperature was the greatest when Food Y was burnt , so it provide the most energy.