PSLE Final Revision
Life Science + Physical Science · every topic that came up in 2023, 2024 and 2025, in one document
Created by Miss Clarissa Ng · www.clartutors.com
Sheet 1 of 2 — Life Science · 8 topics, 17 points to know
PSLE Science — Final Revision
Life Science · the topics that came up in every paper, and how they were asked
Most-tested life topics, 2023–2025: plant reproduction 11 questions, plant water and food 9, cells and classification 6 each.
All of them appeared in 2023, 2024 and 2025 — expect them again on Tuesday.
Booklet A Q1–14 and Booklet B Q29–34 are Life Science. "Explain why": give the cause, not a restatement.
Plants — Reproduction (11)
Pollination to fertilisationPollen joins the ovule on the stigma to form a seed; the ovary becomes the fruit.
DispersalWind, water, animals or explosive — the seed's own feature does it: wing-like, floats, hooks, splits.
GerminationWater, air and warmth — not soil, not light. Stored food feeds the seedling until leaves grow.
Plants — Water & Food (9)
Roots, stem, leavesRoots take in water and minerals; water-carrying tubes carry them up to the leaves.
PhotosynthesisWater + carbon dioxide, with light and chlorophyll, make glucose (stored as starch) + oxygen.
Food tubes and stomataFood-carrying tubes carry food to the growing parts; water is lost as vapour through the stomata.
Life Cycles & Classification (10)
Three-stage or four-stageMosquito and butterfly: egg, larva, pupa, adult. Cockroach, grasshopper and frog: three stages.
Group by featuresInsects: six legs, three body parts. Vertebrates have a backbone — classify by what you can see.
Why we classifyAll living things grow, reproduce, respond to changes and need food, water and air.
Cells & Microorganisms (6)
Cell partsA root cell has a cell wall but no chloroplasts (no light underground); an animal cell has neither.
MicroorganismsBacteria, fungi and yeast: useful (bread, yoghurt, decay) or harmful (spoil food, disease).
Human — Breathing & Blood (4)
Breathing and the heartAir passes down the windpipe to the lungs, where gas exchange with the blood happens; exercise raises the heart rate.
Human — Digestion (4)
The path and absorptionMouth, gullet, stomach, small intestine, large intestine; digested food is absorbed in the small intestine.
Food Chains & Populations (6)
Chains and websGreen plants are the producers — the direct energy source for animals. Arrows show energy flow.
Populations and communitiesOne kind = a population; different populations = a community. Extra fertiliser shifts the numbers.
Adaptations & Man’s Impact (5)
Two kinds of adaptationStructural: fur, blubber, camouflage. Behavioural: migration, hibernation.
Man’s impactDeforestation raises carbon dioxide; pollution and habitat loss leave animals endangered or extinct.
Sheet 2 of 2 — Physical Science · 8 topics, 18 points to know
PSLE Science — Final Revision
Physical Science · the topics that came up in every paper, and how they were asked
Most-tested physical topics, 2023–2025: states and the water cycle 10, electricity 8, heat 7, magnets 6, light 6, springs 5.
Light, forces and energy came up only as MCQs — the long answers landed on states, springs, magnets and heat.
Booklet A Q15–28 and Booklet B Q35–40 are Physical Science. From 2026: 30 MCQs (60 marks) + open-ended (40 marks), 1 h 45 min.
States & the Water Cycle (10)
Heat in, heat outMelting, boiling and evaporation gain heat; condensation and freezing lose it. Temperature holds during the change.
Boiling, evaporation and dewBoiling: bubbles form throughout at a fixed temperature. Evaporation: surface only, any temperature. Dew: vapour condensing on a cold surface.
Electricity (8)
A closed circuitBattery, wires, bulb, switch — an open switch breaks the circuit and the bulb goes out.
BrightnessMore batteries or fewer bulbs in the loop makes the bulb brighter; identical bulbs share the current.
Why a bulb blowsToo much current: too many batteries, or too few bulbs, in the circuit.
Heat (7)
Conduction and insulationHeat travels through solids, particle to particle, best in metals; a double wall with air between slows it down.
ExpansionHeating expands, cooling contracts — a hot wheel shrinks to fit the rim; a heated wire lengthens.
Magnets & Electromagnets (6)
PolesLike poles repel, unlike poles attract; the force acts at a distance, strongest at the poles.
What they attractIron and steel only. Steel bars attract each other only where they are magnetised.
ElectromagnetA current in a coil around an iron bar makes a magnet that switches off with the current.
Light & Shadow (6)
Shadow sizeLight travels in straight lines; move the object or the light closer to the screen and the shadow grows.
How much light passesTransparent almost all (a diamond or jelly is seen clearly), translucent some, opaque none.
Springs & Elastic Force (5)
Stretch and pushA spring stretches when pulled and pushes back when squeezed; it stores elastic potential energy.
Using springsThe greater the stretch or squeeze, the greater the force — springs launch, hold and cushion.
Matter, Floating & Measuring (7)
Properties decide the materialStrength, flexibility, waterproofing and transparency — choose the material that suits the job.
Floating and measuringFind a floating object's volume by displacement; read a tape or ruler from the correct mark.
Forces & Energy (8)
Gravity and frictionGravity pulls things down; friction opposes movement — helpful for grip and braking, harmful as wear.
Energy conversionsLamp: electrical to light + heat. Spring: elastic to kinetic. Some energy always escapes as heat.
How to use these two sheets: read both the night before, then cover the answer line on each flashcard and test yourself out loud.Self-test cards for both sheets: clartutors-materials.pages.dev/PSLE-Science-Revision/psle-final-revision-flashcards