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Primary 6 PSLE Science Systems Quiz

Free P6 PSLE Science Systems quiz, HY3 AI version, with questions, answers, and PSLE-focused practice for Singapore students.

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Primary 6 PSLE Science AI Generated Generated by Tencent HY3 Free Updated 2026-08-17

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Questions

Primary 6 PSLE Science Quiz - Systems

Name: ___________________________
Class: ___________________________
Date: ___________________________
Score: ___________________________

Duration: 45 minutes
Total Marks: 40

Instructions:

This quiz focuses on the theme of Systems in Primary 6 Science (forces, interactions in environment, and energy systems including photosynthesis).
Answer all 20 questions.
Section A: 10 multiple-choice questions (1 mark each).
Section B: 6 short-answer questions (2 marks each).
Section C: 4 structured questions with subparts (total 10 marks).
Write your answers clearly in the spaces provided.

Section A (1 mark each, Q1–Q10)

A force is best described as a __________.
A) type of energy
B) push or a pull
C) form of matter
D) living thing
Which of the following is an example of elastic spring force?
A) A book falling to the floor
B) A stretched rubber band pulling back
C) A magnet attracting a pin
D) A shoe rubbing on the ground
Frictional force always acts __________.
A) in the same direction as motion
B) opposite to the direction of motion
C) downwards only
D) upwards only
In a food chain, a plant is a __________.
A) consumer
B) decomposer
C) producer
D) predator
Which organism breaks down dead plants and animals?
A) Producer
B) Decomposer
C) Prey
D) Predator
Photosynthesis takes place mainly in the __________ of a plant.
A) roots
B) leaves
C) flowers
D) stem
Which of the following is NOT needed for photosynthesis?
A) Light energy
B) Water
C) Carbon dioxide
D) Oxygen
A group of the same kind of organisms living together is called a __________.
A) community
B) population
C) habitat
D) ecosystem
Which of the following is a useful effect of friction?
A) Wearing out of shoe soles
B) Tyres gripping the road
C) Heat in a machine
D) Slowing a sliding box
The Sun is the primary source of energy for __________.
A) only animals
B) only plants
C) all living things on Earth
D) only decomposers

Section B (2 marks each, Q11–Q16)

State two effects a force can have on an object.
Explain why a stretched spring can push or pull an object.
Draw a simple food chain with three organisms found in a pond.
Name two negative impacts of man on the environment.
State two requirements for photosynthesis and one product.
Describe one structural adaptation of a fish and explain how it helps the fish survive.

Section C (Q17–Q20, total 10 marks)

(a) What is gravitational force? (1 mark)

(b) How does gravitational force give an object weight? (1 mark)
A student sets up an experiment to show that light is needed for photosynthesis.
(a) State one variable the student must keep the same. (1 mark)

(b) What result would show photosynthesis happened? (1 mark)
The diagram shows a simple system of a ball on a slope.

Diagram for Q19 (P6 Science)

Generated diagram for Q19.

(a) Name the force that pulls the ball down the slope. (1 mark)  
_______________________________________________________  
(b) Name the force that slows the ball. (1 mark)  
_______________________________________________________

20. A garden has grass, grasshoppers, frogs, and snakes.
(a) Draw a food web linking these organisms. (1 mark)
_______________________________________________________
(b) What happens to the frog population if snakes are removed? Explain. (2 marks)
_______________________________________________________
_______________________________________________________

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Answers

Primary 6 PSLE Science Quiz - Systems (Answer Key)

Total Marks: 40
Topic: Systems (forces, environmental interactions, energy/photosynthesis)

Section A (1 mark each)

B) push or a pull
Teaching note: A force is any interaction that, when unopposed, changes the motion of an object. It is not energy or matter.
B) A stretched rubber band pulling back
Teaching note: Elastic spring force is exerted by elastic materials when stretched or compressed.
B) opposite to the direction of motion
Teaching note: Friction opposes relative motion between two surfaces in contact.
C) producer
Teaching note: Producers (e.g., plants) make their own food using sunlight.
B) Decomposer
Teaching note: Decomposers break down dead matter, returning nutrients to the soil.
B) leaves
Teaching note: Leaves contain chlorophyll and are the main site of photosynthesis.
D) Oxygen
Teaching note: Oxygen is a product, not a requirement. Requirements: light, water, CO₂.
B) population
Teaching note: Population = same species in one place. Community = many populations.
B) Tyres gripping the road
Teaching note: Grip is useful friction; wear and heat are usually unwanted.
C) all living things on Earth
Teaching note: Sun’s energy flows to plants then animals via food chains.

Section B (2 marks each)

Any two of: move a stationary object; speed up/slow down/change direction of moving object; stop a moving object; change shape. (1 mark each)
Teaching note: These are the four standard effects of forces from syllabus.
A stretched spring exerts elastic spring force because elastic materials return to original shape and pull/push objects as they recover. (2 marks: 1 for stretched elastic material, 1 for force on object)
Example: algae → tadpole → fish (2 marks: 3 organisms in correct arrow direction = 2)
Common mistake: Arrows must show energy flow (producer to consumer).
Any two: deforestation, pollution (land/water/air), depletion of resources, global warming. (1 mark each)
Requirements: water, light energy, carbon dioxide (any two = 1 mark); Product: sugar and oxygen (1 mark for one product).
Example: Streamlined body (1 mark) reduces water resistance and helps fish swim faster (1 mark).
Marking: Structural feature + linked survival benefit.

Section C

(a) Gravitational force is the pull of the Earth on objects. (1 mark)
(b) Weight is the gravitational force acting on an object (1 mark: links gravity to weight).
(a) Keep same: water, CO₂, plant type, temperature (1 mark for any one controlled variable).
(b) Leaf tested for starch turns blue-black with iodine (1 mark: starch = proof of photosynthesis).
(a) Gravitational force (1 mark)
(b) Frictional force (1 mark)
Image note: Diagram must show downward arrow (gravity) and up-slope arrow (friction).
(a) Food web: grass → grasshopper → frog → snake; grass → grasshopper → frog (1 mark for linking all four correctly).
(b) Frog population increases (1 mark) because fewer frogs are eaten by snakes (1 mark for explanation).
Teaching note: Removal of predator causes prey population rise (top-down effect).