1) To make food, they must have sunlight, water, carbon dioxide, chlorophyll.
2) chlorophyll
3) sugar, oxygen
4) starch
5) oxygen, carbon dioxide
6) light
7) energy
8) producers
9) croton , copper leaf plant
10) underside
11) chlorophyll
12) iodine
Friday, October 9, 2009
Revision Notes - circulatory System
1b) transported
c) Blood
2a) tubes
b) Heart
c) i) Arteries : carry blood away from the heart to other parts of the body.
ii) Veins : carry blood from the body back to the heart.
iii) capillaries : connect arteries to veins.
3.
a) pump
b) muscle
c) heartbeat, 70
e) when we exercise, our heart beats faster so that more blood and hence food and oxygen can reach different parts of our body faster.
f) carbon dioxide.
c) Blood
2a) tubes
b) Heart
c) i) Arteries : carry blood away from the heart to other parts of the body.
ii) Veins : carry blood from the body back to the heart.
iii) capillaries : connect arteries to veins.
3.
a) pump
b) muscle
c) heartbeat, 70
e) when we exercise, our heart beats faster so that more blood and hence food and oxygen can reach different parts of our body faster.
f) carbon dioxide.
Science Prelim Practice 3 Answer Key
42a) Note : Vertical axis (Height to which ball bounced (cm)
Horizontal Axis (Height from which ball was dropped (cm)
b) As the height from which the tennis ball was dropped increases, the distance the ball bounced increased.
43a) P - C, Q - D
b) No, they will not be affected by the chemicals. The flow of river water is downwards towards the two factories. OR
Factory A and C are down by the river, so they will not get the polluted water.
44.
A - Blue - There is no change in the amount of carbon dioxide. OR NO respiration / No photosynthesis -> hence no carbon dioxide is produced.
B - Blue - The plants carries out photosynthesis and give out oxygen.
C -Yellow - The fish carries out respiration and produces carbon dioxide.
D - Blue - The plant uses carbon dioxide given by the fish to carry out photosynthesis.
45. b) He must move the torchlight nearer to / further from the pencil and measure the length of the shadow at teach interval.
Compare the results at each interval and determine if the hypothesis is correct or not.
46. a) Electrical energy --> kinetic energy --> sound energy.
b) No, it is a non-magnetic material.
Horizontal Axis (Height from which ball was dropped (cm)
b) As the height from which the tennis ball was dropped increases, the distance the ball bounced increased.
43a) P - C, Q - D
b) No, they will not be affected by the chemicals. The flow of river water is downwards towards the two factories. OR
Factory A and C are down by the river, so they will not get the polluted water.
44.
A - Blue - There is no change in the amount of carbon dioxide. OR NO respiration / No photosynthesis -> hence no carbon dioxide is produced.
B - Blue - The plants carries out photosynthesis and give out oxygen.
C -Yellow - The fish carries out respiration and produces carbon dioxide.
D - Blue - The plant uses carbon dioxide given by the fish to carry out photosynthesis.
45. b) He must move the torchlight nearer to / further from the pencil and measure the length of the shadow at teach interval.
Compare the results at each interval and determine if the hypothesis is correct or not.
46. a) Electrical energy --> kinetic energy --> sound energy.
b) No, it is a non-magnetic material.
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.
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.
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