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PSLE Science Practice Questions & AI Tutoring
Practise PSLE Science multiple-choice questions aligned to the Primary School Leaving Examination (PSLE). WeloScholars covers all 10 topics — including Diversity, Cycles, Systems, Interactions — with curriculum-aligned MCQs, an AI tutor that explains every concept step by step, and analytics that show exactly where to focus next. Every question includes a clear explanation of the correct answer and why each distractor is wrong, building real conceptual understanding. Start free: no credit card needed, and your first practice session takes under a minute to set up.
All 10 PSLE Science topics
Diversity
- DiversityIdentify and classify organisms as producers, primary consumers, secondary consumers, or decomposers based on their roles in an…
Cycles
- CyclesDescribe the life cycles of animals, distinguishing between complete metamorphosis (e.g., butterfly, mosquito) with stages like…
- Water and Changes of StateDescribe the processes of evaporation, condensation, melting, freezing, and boiling as changes of state of water.
Systems
- SystemsIdentify the mouth, oesophagus, stomach, small intestine, and large intestine as key organs of the digestive system and describ…
- Plant Parts and FunctionsIdentify the main parts of a plant (roots, stem, leaves, flowers, fruits, seeds) and state their functions.
- Human Body SystemsIdentify the main parts of the digestive system (mouth, gullet, stomach, small intestine, large intestine) and state their func…
- Electrical SystemsIdentify and draw standard circuit symbols for cell/battery, bulb, switch, and wire.
Interactions
- InteractionsDescribe friction as a contact force that opposes motion between two surfaces in contact.
- MagnetsIdentify magnetic and non-magnetic materials.
Energy
- EnergyIdentify and name the different forms of energy: light, heat, sound, electrical, kinetic, chemical potential, gravitational pot…
Try 5 real PSLE Science practice questions
Which of the following is correct for both the cockroach and mosquito?
- A. (1) Both their young look like the adults.
- B. (2) Both their life cycles start with an egg.
- C. (3) The life cycle of cockroach has three stages while mosquito has four stages.
- D. (4) The young of cockroach lives in water while the young of mosquito lives on land.
✅ Answer: C
1. A cockroach undergoes incomplete metamorphosis, progressing through three stages: egg, nymph, and adult.
2. A mosquito undergoes complete metamorphosis, passing through four stages: egg, larva, pupa, and adult.
3. Therefore, the statement "The life cycle of cockroach has three stages while mosquito has four stages" is correct.
A is incorrect because the young (larva and pupa) of a mosquito do not resemble the adult mosquito.
B is incorrect because while both life cycles start with an egg, this is a general characteristic of most insects and does not highlight the specific details of their differing metamorphoses.
D is incorrect because the young of a cockroach lives on land, while the young of a mosquito lives in water.
Which of the following describes adaptations of animals that prevent their predators from spotting them? A Changing body colour to green when on a green leaf B Changing fur colour from brown to white during snowy winter C A non-poisonous animal having the appearance of a poisonous animal D Having body shapes and colour that look like branches on the plant that they live on (1) A only (2) B and C only (3) A, B and D only (4) A, C and D only
- A. A only
- B. B and C only
- C. A, B and D only
- D. A, C and D only
✅ Answer: C
1. Adaptations such as changing body colour to green (A) or white during winter (B), and having body shapes and colours resembling branches (D), are forms of camouflage.
2. Camouflage makes an animal blend seamlessly with its environment.
3. This directly prevents predators from visually detecting or spotting the animal.
4. Therefore, A, B, and D are all correct adaptations that prevent predators from spotting them.
A (1) is incorrect because B and D also describe adaptations that prevent predators from spotting animals.
B (2) is incorrect because statement C describes mimicry, which deters predators *after* they are spotted, not by preventing them from being spotted; additionally, A and D are also correct.
D (4) is incorrect because statement C does not prevent spotting, and B is also a correct adaptation for preventing spotting.
Which of the following is not a renewable source of energy?
- A. sun
- B. wind
- C. water
- D. candle
✅ Answer: D
1. Renewable energy sources are natural resources that replenish themselves over a relatively short period. Non-renewable sources are finite and take millions of years to form.
2. The sun, wind, and water (through hydrological cycles) are constantly replenished, making them renewable energy sources. A candle burns wax, which is derived from petroleum (a fossil fuel) or plant/animal fats, both of which are finite or take time to produce, making it a non-renewable source of energy.
A is incorrect because the sun provides solar energy, which is a renewable source as it is continuously available.
B is incorrect because wind energy is renewable, generated by the natural movement of air currents.
C is incorrect because water, used in hydroelectric power, is a renewable resource continually replenished by the water cycle.
Which of the following organ systems are involved when we walk and run? A Skeletal system B Respiratory system C Circulatory system D Muscular system
- A. A and C only
- B. B and D only
- C. B, C and D only
- D. A, B, C and D
✅ Answer: D
1. The muscular system contracts to pull on the skeletal system, enabling movement like walking and running. These activities require more energy, so the respiratory system works harder to take in oxygen. The circulatory system then transports this oxygen and nutrients to the muscles, and removes waste products like carbon dioxide.
2. A is incorrect because the respiratory and muscular systems are also crucial for facilitating movement and providing necessary oxygen.
B is incorrect because the skeletal system provides the framework for movement and the circulatory system transports vital substances.
C is incorrect because the skeletal system provides the essential support and levers for movement.
Nora saw bird X in a garden. Thirty minutes later, she concluded that bird X forms a population in the garden community. Which of the following observations allowed her to make the conclusion? A Bird X eating earthworms B Bird X feeding two of its young C Bird X preyed on by its predator D Bird X building its nest with its mate
- A. A and B only
- B. A and C only
- C. B and D only
- D. A, B, C and D
✅ Answer: C
1. A population is defined as a group of organisms of the same species living in the same area and capable of interbreeding.
2. Observing bird X feeding its young (B) or building a nest with a mate (D) indicates the presence of multiple individuals of the same species and reproductive activity, which are key characteristics of a population.
A is incorrect because bird X eating earthworms shows a feeding relationship with another species, not evidence of a population of bird X.
B is incorrect because it includes A, which does not provide evidence of a population.
D is incorrect because it includes A and C, which do not provide evidence of a population.
Free PSLE Science study notes
Revise the theory first — interactive, exam-focused notes for PSLE Science topics, free to read.
How WeloScholars helps with PSLE Science
- Concept-first explanations — diagrams, misconception traps and “why the other options are wrong” for every question.
- Ask Mr Tan, the AI tutor — stuck on a Science concept? Get a patient, step-by-step explanation, any time.
- Snap & Solve homework help — photograph a tricky question and get a clear worked solution in seconds.
Frequently asked questions
Is this aligned to the current Singapore MOE syllabus?
Yes. WeloScholars maps every PSLE Science question to the official syllabus, topic by topic, and updates when the syllabus changes. Off-syllabus content is excluded.
How many PSLE Science topics are covered?
All 10 topics in the PSLE Science curriculum, each with its own question pool, learning objectives and AI tutor support.
Can my child practise PSLE Science for free?
Yes. The free plan includes practice questions every month plus a demo you can try without creating an account. Premium unlocks unlimited practice and full explanations.
Related practice
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