PSLE Science keywords: the exact words the marker wants in 2026 (with model answers)

The PSLE Science paper has a Booklet A of multiple-choice questions and a Booklet B of open-ended ones. Most families spend revision time on facts — and most of the dropped marks happen in Booklet B, where a child who clearly understands the topic still loses marks because of how they wrote the answer. The marker is not reading for effort or length. They are reading for the exact words the marking scheme expects, tied to the scenario in the question. This guide is about those words.

It pairs with the PSLE 2026 memorisation guide, which covers exam dates, AL scoring and what to revise across every subject. Here we go deep on one high-leverage corner: the phrasing of Science open-ended answers.

What changed in PSLE Science for 2026 — and why phrasing matters more

Two changes are worth knowing. The topic on Cells has been removed from the examinable syllabus, and MOE has fixed a standard sequence of topics across all schools so progression is consistent nationally. The official syllabus and exam format are set by MOE and SEAB, and those pages are the source to confirm against.

The change that matters most for revision is the shift in emphasis. The 2026 paper leans harder on scientific inquiry and applying concepts to a situation, and away from pure factual recall. That sounds like it should make memorising less useful. It does the opposite for phrasing. When the question stops asking "what is condensation?" and starts asking "explain why water droplets formed on the outside of the cold glass," the mark no longer sits on a definition you can recognise — it sits on a cause-and-effect sentence you have to produce, in the right words, about this glass. Recall of the definition is the floor. The scoring happens one level up, in the wording.

Why open-ended answers lose marks even when the child understands

The frustrating pattern for parents: your child explains the concept perfectly out loud, then writes something that earns half the marks. A few specific things cause it, and all of them are about language rather than understanding.

• Everyday words instead of the scientific term. "The water disappeared" instead of "the water evaporated and changed into water vapour." "Heat goes through it" instead of "it is a good conductor of heat."
• A fact with no link to the scenario. Writing "metal is a good conductor of heat" can score zero on its own. The mark needs the consequence in this situation: "...so heat is transferred from the hot soup to the spoon, and the spoon gains heat."
• Answering only one part. "Explain why and state what happens" is two marks. Many answers give one and stop.
• Length mistaken for correctness. A long, intelligent-sounding answer that never contains the required keyword still scores zero. Markers reward scientific precision, not word count.

None of these are knowledge problems. They are phrasing habits, which is exactly why they respond so well to drilling a fixed set of model phrases.

The "keyword = mark" framework — and the keyword myth

It is tempting to tell a child "just put in the magic word." That is the keyword myth, and it fails, because a keyword dropped into a vague sentence earns nothing. A scoring answer joins three things:

1. The correct scientific keyword — evaporation, condensation, conductor, gravitational force, photosynthesis.
2. A cause-and-effect link — because, so, therefore, as a result, this causes. These words force the answer from stating a fact into explaining a relationship.
3. The link tied to the actual scenario, often with a comparative — faster, slower, more, less, larger, smaller.

Teachers package this into frameworks like PSC (Process the question → State the Science → Conclude by answering what was asked) or Claim–Evidence–Reasoning. The framework matters less than the habit underneath it: keyword + cause-and-effect + scenario, and answer every part the question asks for.

Say this, not that

The same science, scored and unscored, side by side:

"Why did the ice cube get smaller on the table?"

• ✗ Weak: "The ice melted / disappeared."
• ✓ Scoring: "The ice gained heat from the surroundings and melted, changing state from solid to liquid."

"Why did the metal spoon in hot soup become hot?"

• ✗ Weak: "Metal lets the heat go through it."
• ✓ Scoring: "Metal is a good conductor of heat, so heat is transferred from the hot soup to the cooler spoon and the spoon gains heat."

"Why did water droplets form on the outside of a cold glass?"

• ✗ Weak: "The water came out of the glass."
• ✓ Scoring: "Water vapour in the surrounding air lost heat to the cold glass and condensed into water droplets."

"Why does a cup of hot water cool down faster in a metal cup than a plastic one?"

• ✗ Weak: "Metal is colder."
• ✓ Scoring: "Metal is a better conductor of heat than plastic, so heat is transferred away from the water faster, and it cools down more quickly."

"Why do green plants need sunlight?"

• ✗ Weak: "To grow / to stay alive."
• ✓ Scoring: "Plants need light energy to make food (glucose) by photosynthesis."

The pattern repeats across every topic: a precise term, a causal connector, and the consequence applied to the scenario in front of the child.

Command words: when one word is enough, and when it isn't

Half of phrasing is reading the question's command word and giving it exactly what it asks — no more, no less.

• State, Name, List, Give — a word or short phrase. No explanation needed, and adding a wrong one can cost the mark.
• Explain, Why, How, Describe, Suggest — a cause-and-effect answer. This is where the keyword-plus-link sentence is required, and where most marks are won or lost.

A child who writes a full explanation for a "state" question wastes time; a child who writes one line for an "explain" question loses marks. Knowing the difference is itself a revisable skill.

Turn it into a 10-minute daily review

The phrasing is a finite set. There are only so many ways the syllabus asks about heat gain, conductors, evaporation, condensation, photosynthesis, digestion, forces and circuits. That finiteness is what makes it perfect for flashcards and spaced repetition: the cue scenario on the front, the model-answer phrase on the back, reviewed in small daily batches so the wording is automatic by September.

This is also active recall in its purest form — the child produces the sentence from memory rather than rereading a worked example and feeling like they know it. The struggle to retrieve the exact phrase is what makes it stick.

A simple plan that fits a Primary 6 week:

1. Now through the holidays: build the deck from the topics already covered, plus every open-ended answer your child got marked down on. A wrong answer from a practice paper is the best possible card.
2. Daily: ten minutes of review. The system resurfaces the phrases your child is about to forget, so the time goes to weak cards, not ones already solid.
3. Before the paper: the heavy lifting is already done, so the final weeks are timed past-paper practice rather than cramming vocabulary.

How Memor More fits PSLE Science prep

Memor More is a flashcard app built on active recall and spaced-repetition scheduling, which is exactly what a finite set of model phrases needs. Two ready-made, free decks cover the two layers of PSLE Science:

• The PSLE Science: Key Terms & Concepts deck — 50 definitions and concepts for the recall floor.
• The PSLE Science: Model-Answer Keywords deck — 125 "say this, not that" cards that pair a real exam cue with the scoring phrase, across all six high-frequency 2026 topics: heat and energy transfer, plants and photosynthesis, the human digestive system, forces, electrical circuits, and matter and the water cycle. It includes command-word cards and "improve this answer" prompts so a child practises rewriting weak phrasing into the version that scores.

A few app features fit this use case in particular:

• Shared decks let a parent or tutor build the set once and share it to the child, or to a whole tuition group — build once, study many.
• AI-assisted card creation turns a page of marked-up answers or a list of keywords into cards quickly, so making the deck doesn't become its own chore.
• Images let a child attach a diagram to a concept, giving the memory a second hook.

None of this replaces understanding the science or doing past papers. It takes the part of PSLE Science that is pure phrasing — the part that quietly loses the most marks — and drills it with the methods the research actually supports.

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Further reading

• PSLE 2026: how to help your child memorise Science, 听写 and English vocab
• Spaced repetition for Singapore students: PSLE to A-Level
• Memorising Chinese 听写 and Mother Tongue vocabulary
• What is active recall? A science-backed explanation
• Spaced repetition: what 130+ years of research actually shows