Sa1 revision 1 2012 answer notes
Transcript of Sa1 revision 1 2012 answer notes
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SA1 REVISION 2 2012
P6 Science
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Booklet A
What to do
Understand the concept for each
question.
Underline the key words (question).
Understand the explanations for each
question.
Write down the correct answer as
correction.
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Question 1 – Answer (2)
Concept:
Food web
Key words (Question)
removed, most negative impact
Explanation
Plants provide food for all living thing, thus they
will have the most negative impact when
removed.
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Question 2 – Answer (4)
Concept:
Food chain
Key words (Question)
NOT true
Explanation
1. True – grass gets energy from Sun to make food
2. True – Mynah gets energy from grasshopper when the mynah eats the grasshopper
3. True – Energy is passed from one organism to another in the food chain
4. NOT true – grasshopper does not make food
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Question 3 – Answer (1)
Concept:
Energy forms and Uses
Key words (Question)
incorrect
Explanation
1. Incorrect – energy is not created
2. Correct – solar means light
3. Correct – fossil fuels are organisms that was once
alive
4. Correct – Every organism gets its energy directly or
indrectly from the Sun.
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Question 4 – Answer (1)
Concept:
Friction
Key words (Question)
surface, distance travelled, true
Explanation
The greater the friction, the lesser the distance
travelled by the box.
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Question 5 – Answer (3)
Concept:
Force
Key words (Question)
NOT
Explanation
Mass is the amount of matter in an object. Weight
is the force acting on an object due to gravity.
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Question 6 – Answer (2)
Concept:
Photosynthesis
Key words (Question)
Successful production of oxygen
Explanation
Photosynthesis occurs only in the presence of
light.
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Question 7 – Answer (1)
Concept:
Energy conversion
Key words (Question)
Temperature rises considerably at point Z
Explanation
The kinetic energy (when the wire is bending
back and forth) is converted to heat energy.
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Question 8 – Answer (4)
Concept:
Elastic potential energy
Key words (Question)
5 turns, 10 turns, 15 turns, 20 turns
Explanation
The only variable that is changed is the number of
turns.
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Question 9 – Answer (3)
Concept:
Elastic spring force
Key words (Question)
Forces acting on the spring
Explanation
When you stretch a spring, the spring will exert a
force to try and pull it back to its original length.
When you compress a spring, the spring will
exert a force to try and push it back to its original
length.
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Question 10 – Answer (1)
Concept:
Volume and weight (matter)
Key words (Question)
Equal volume, different weights
Explanation
Volume is the amount of space an object takes
up.
Mass is the amount of matter in an object.
Therefore, although all 4 cubes have the same
volume, it does not mean they have the same
mass.
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Question 11 – Answer (2)
Concept:
Environment
Key words (Question)
Fungi
Explanation
Fungi grow in damp and warm places.
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Question 12 – Answer (1)
Concept:
Food web
Key words (Question)
Increase,
mynah population
Explanation
When mynah’s population increase, they will eat more ladybird and spider. Therefore if ladybird and spider’s population decreases, their prey (which are aphid and whitefly) will have less predator and thus increase in number.
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Question 13 – Answer (1)
Concept:
Adaptation
Key words (Question)
Function, drip tip
Explanation
The drip tip allows raindrops to run off quickly so
that it doesn’t collect on the leaves which will
block the stomata.
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Question 14 – Answer (4)
Concept:
Forces
Key words (Question)
Correct forces
Explanation
A – gravity acts from a distance and is always a pull
B – magnetic force acts from a distance and can be a pull (attraction) or a push (replusion)
C – friction acts only on contact and opposes the motion
D – push only acts when you are touching the object and it follows the motion
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Question 15 – Answer (2)
Concept:
Elastic potential energy
Key words (Question)
Number of turns, distance moved
Explanation
1 – true, based on graph
2 – false, 120 turns is needed to move 8 cm
3 – true, more number of turns, more energy stored, thus greater distance moved
4 – true, based on graph
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Question 16 – Answer (2)
Concept:
friction
Key words (Question)
Coated with liquid D, lubricating
Explanation
The aim of lubricating the moving parts of a
machine is to reduce friction to prevent wear and
tear. Thus, the liquid used must be able to reduce
friction the best.
The greater the distance moved by the wooden
block, the lesser the friction (or reduce the friction
the best).
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Question 17 – Answer (4)
Concept:
Environment – conditions for survival
Key words (Question)
Kill, more quickly
Explanation
Fair test – only the variable tested must change.
In this case, the variable that is changed is the
type of pesticide. All other variables must be kept
the same.
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Question 18 – Answer (2)
Concept:
Environment – interaction of organisms
Key words (Question)
Effectively remove the caterpillars
Explanation
Bird Q eats the most caterpillars (as number of
caterpillars left is the least) thus the most effective
to remove the caterpillars.
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Question 19 – Answer (4)
Concept:
Decomposers
Key words (Question)
decomposers
Explanation
Decomposers (e.g. bacteria) act on dead
organisms and animal waste to break them down
into simpler substances (e.g. nutrients) which is
absorbed by the plants.
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Question 20 – Answer (3)
Concept:
Environment – factors affecting survival
Key words (Question)
disease
Explanation
A disease will cause the drop in the number of
rabbits.
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Question 21 – Answer (2)
Concept: Environment – factors affecting survival
Key words (Question) Supported by the above data
Explanation1. Wrong – The presence of some earthworms indicate
earthworms can still survive in clayey soil.
2. Correct – The number of earthworms in garden soil is the greatest.
3. Wrong – there is not much moisture in sand and clayey soil.
4. Wrong – Since the numbers are all different, the earthworms do not thrive equally well.
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Question 22 – Answer (2)
Concept:
Matter – good conductor of heat and electricity
Key words (Question)
Good conductor, heat, electricity
Explanation
1. Book is a poor conductor of heat and electricity
2. Iron nail and key are made of metal which are good conductors of heat and electricity
3. Plastic comb is a poor conductor of heat and electricity
4. Rubber phone cover is a poor conductor of heat and electricity
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Question 23 – Answer (1)
Concept:
Water - Condensation
Key words (Question)
Cold room, tiny droplets
Explanation
Warm water vapour from the surrounding air
touches the cooler surface of the window, loses
heat and changes to water droplets.
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Question 24 – Answer (4)
Concept:
Cells
Key words (Question)
Does not belong
Explanation
Option 1 – 3 are animal cells, option 4 is a plant
cell since only plant cells have cell wall.
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Question 25 – Answer (3)
Concept:
Materials
Key words (Question)
Different materials
Explanation
Foam is the worst conductor of heat thus heat
from the cup will take the longest to escape to the
surrounding air, thus will contain the highest water
temperature after 1 hour.
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Question 26 – Answer (2)
Concept:
Human digestive system
Key words (Question)
Produce digestive juices
Explanation
Mouth, stomach and small intestines contains
digestive juices. Large intestines only absorbs
water, so no digestion takes place there.
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Question 27 – Answer (1)
Concept:
Plant parts
Key words (Question)
Plant parts
Explanation
They are all stems that store food.
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Question 28 – Answer (4)
Concept:
Electricity
Key words (Question)
Diagram 1, only bulb B lit up
Diagram 2, bulb A lit up but bulb B did not
Explanation
Since only the right bulb lights up, Y is the
conductor of electricity but X is not.
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Question 29 – Answer (3)
Concept:
Seed dispersal
Key words (Question)
hooks
Explanation
Seeds / fruits with hooks will be dispersed by
clinging onto the fur of animals.
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Question 30 – Answer (2)
Concept:
Reproduction
Key words (Question)
Reproduction, plants, animals
Explanation
1. Not true for animals
2. True for both
3. Not true for both
4. Animals does not have pollen grains
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Booklet B
What to do
Understand the concept for each
question.
Underline the key words (question).
Write down the key words (answer) for
each question (that you did not get full
marks) as correction.
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Question 31
Key Concept:
Living things need air, food and water to survive.
Key Words or Phrases
Question Answer
a) Name, gas Oxygen
b) Explain,
dependent
Plants give out oxygen
during photosynthesis
c) Explain, dark room Lizard die because no
oxygen
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Question 32
Key Concept:
Living things need air, food and water to survive.
Key Words or Phrases
Question Answer
a) Explain, survive Snails give carbon dioxide for
plants to make food
b) Explain, survive Plants give out oxygen during
photosynthesis needed by
snails
c) Explain, amount
of oxygen
Less oxygen as more snails
taking in oxygen
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Question 33
Key Concept:
Photosynthesis requires sunlight, water and
carbon dioxide.
Key Words or Phrases
Question Answer
a) True, False, NPTT F, F, NPTT, NPTT
b) Suggest why,
unfavourable
Plants cannot receive
enough sunlight to make
foodNo sunlight Wrong concept as sheltered areas will still
get sunlight. It’s just not enough.
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Question 34
Key Concept:
Different factors affect the local environment
Key Words or Phrases
Question Answer
a) Explain, Most loss
in massQ. Strong wind, evaporate
faster (Q does not have most exposed
surface area so large exposed surface area is
correct but not larger/largest exposed surface
area)
b) What, P dry faster Bigger (comparison) surfaced area
c) Suggest, dry
faster without
additional tools
Sunny place / less humid
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Question 35
Key Concept:
Adaptations serve to enhance survival
Key Words or Phrases
Question Answer
a) Explain, change
colour, survive
Hide / blend with
surroundings to escape
predators
b) Which feature,
explain
Large ears. Large surface
area to allow animal to cool
down
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Question 36
Key Concept:
A force can move a stationary object
Key Words or Phrases
Question Answer
a) State, change in
energy
GPE KE
b) State, which balls 3, 4, 5
c) Ball 1 heavier,
what change
Ball 5 – move further /
higher
http://www.walter-fendt.de/ph14e/ncradle.htm
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Question 37
Key Concept:
Friction is an opposing force relative to the motion
of objects.
Test is on the size of wheel
Key Words or Phrases
Question Answer
a) Describe,
correct (fair
test)
Same plank
b) List, 2 mistakes Did not change size of wheel
Did not use same number of wooden
blocks
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Question 38
Key Concept:
Forces causes the extension of springs
Compare mass of …
Key Words or Phrases
Question Answer
a) List, 2
variables
Same spring / Same scale pan
b) What,
measure,
greatest mass
Length of spring / Extension of
the spring
c) Explain, different extension / length /
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Question 39
Key Concept:
Environmental conditions affects the habitat of
decomposers
Key Words or Phrases
Question Answer
a) What, min temp 25oC
b) State, conclusion The lower the temperature, the
slower the rate of decomposition
c) Suggest, one way,
Explain
Cold place / refrigerator
slow down the rate of
decomposition.
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Question 40
Key Concept:
Plants, animals, fungi and microorganism forms
the 4 major groups in classification of living things
.
Key Words or PhrasesQuestion Answer
a) Explain, cake P not enough water / little water /
moisture
b) How, mould get
food
break down the cake into simpler
substances and absorb nutrients
c) Another similarity,
fungi, plants
respond to changes OR
grow and reproduce OR
cannot move freely from place to
place
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Question 41
Key Concept:
Use of magnets to separate magnetic objects
Key Words or Phrases
Question Answer
a) Suggest,
separate
Use magnet to attract steel ball
bearings
b) Suggest,
another,
separate
Pour contents slowly into the
bucket of water. Cork pieces
will float
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Question 42
Key Concept:
Temperature is a measurement of how hot or cold
an object is; heat is a form of energy.
Key Words or Phrases
Question Answer
a) Arrange S,Q,R,P
b) Explain, longer Greater volume of water at
100oC
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Question 43
Key Concept:
An electrical system comprises of various
components.
Key Words or Phrases
Question Answer
a) Group Parallel – B, D, E
Series – A, C, F
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Question 44
Key Concept:
Plants reproduce to ensure the suvival of their
own kind.
Key Words or PhrasesQuestion Answer
a) How many
months
5 months
b) Draw, Red
Clover