Click a label from the bank, then click the correct spot on the diagram. Master every diagram that appears in PSLE Science!
Diagram labelling is a key skill tested in PSLE Science. Students are asked to label parts of biological systems, scientific apparatus and natural processes. Marks are often lost when students confuse similar-sounding terms or cannot recall the exact name required by the marking scheme.
This free interactive diagram labelling tool gives Singapore Primary students hands-on practice labelling the most commonly tested diagrams in PSLE Science. Click on each hotspot and select the correct label from the word bank — just like the labelling tasks that appear in the actual PSLE paper.
These are the most commonly tested diagrams in PSLE Science examinations:
Follow these tips to score full marks on diagram labelling questions:
Select a diagram from the menu above. Each diagram shows interactive hotspots — the numbered or coloured circles — that mark the parts to be labelled. Click on a hotspot, then select the correct label from the word bank at the bottom of the screen.
After completing the diagram, review any incorrect answers and study the correct labels. Repeat each diagram until you can label all parts correctly without any help. Regular practice with this tool will help you achieve full marks on diagram labelling questions in the PSLE Science examination.
Every year, PSLE Science markers report the same pattern: students lose marks on diagram labelling not because they don't know the topic, but because they write the wrong word for a part they actually understand. A student who can explain how the digestive system works in full sentences still writes "food tube" instead of "oesophagus" and loses the mark. This is a vocabulary problem, not a knowledge problem — and it is completely fixable with the right practice.
Diagram labelling questions appear in both Booklet A (as options in multiple-choice questions) and Booklet B (as direct label-the-diagram tasks). In Booklet B, these questions are often worth 2–4 marks and take only seconds to answer correctly — making them some of the highest-value marks-per-minute in the entire paper. Students who drill diagram labels consistently find that these questions become fast, reliable mark-getters on exam day.
Simply reading a diagram in a textbook is one of the least effective ways to memorise labels. Research on how memory works shows that active recall — where you force yourself to produce the answer rather than recognise it — creates far stronger memory traces. This is why this tool works: instead of reading that the trachea connects the throat to the lungs, you must recall and place the word "trachea" yourself.
The most effective study method combines three steps. First, study the diagram with labels visible. Second, cover the labels and attempt to recall each one aloud or in writing. Third, check your answers immediately and note which labels you got wrong. Repeating this cycle — study, cover, recall, check — is far more effective than re-reading the diagram multiple times. This tool automates that cycle for you.
These diagrams have appeared consistently across PSLE papers from 2015 to 2024. Master every label on this list and you will be fully prepared for any diagram question in the examination.
1. The Human Digestive System
The digestive system must be understood as a tube with accessory organs. The tube itself runs: mouth → oesophagus → stomach → small intestine → large intestine → rectum → anus. Students frequently confuse the small intestine and large intestine — remember that "small" and "large" refer to the diameter, not the length. The small intestine is actually much longer (about 6–7 metres) but narrower. The accessory organs — liver, pancreas and gallbladder — are not part of the tube but they produce or store digestive juices that flow into it. The liver is the largest organ on the right side. Many students forget to label the liver at all.
2. The Human Respiratory System
Air enters through the nose (or mouth), passes through the trachea, splits into two bronchi (one for each lung), then divides further into bronchioles, and finally reaches the alveoli where gas exchange occurs. The diaphragm is the dome-shaped muscle below the lungs — it flattens when you breathe in, creating space for the lungs to expand. The most commonly missed label is the diaphragm. Students also confuse bronchus (singular) with bronchi (plural) — the PSLE marking scheme accepts both if the arrow points to the correct structure.
3. Parts of a Flower
The flower has male parts (stamen = anther + filament) and female parts (pistil = stigma + style + ovary + ovule). The petals attract pollinators. The sepals are the green leaf-like parts that protected the flower when it was a bud. A very common mistake: students write "ovule" when the arrow points to "ovary" or vice versa. Remember — the ovary is the whole container; the ovule is the egg inside it. In a cross-section diagram, the ovule is shown as a small oval shape inside the ovary.
4. The Water Cycle
The water cycle has four main processes: evaporation (liquid water becomes water vapour, driven by the sun's heat), condensation (water vapour cools and becomes liquid droplets, forming clouds), precipitation (water falls as rain, hail or snow), and collection (water gathers in rivers, lakes and the sea). A fifth process — transpiration — is the evaporation of water from plant leaves. In PSLE questions, students often confuse condensation and precipitation. Condensation makes clouds; precipitation makes rain fall from clouds.
5. An Electrical Circuit
In a circuit diagram, students must identify: the cell (one short and one long line), the battery (multiple cells in series), the switch (an open or closed gap), the bulb (circle with an X inside), the ammeter (circle with A), and the connecting wires. The most common error is calling a single cell a "battery" — a battery is technically two or more cells. The PSLE marking scheme is strict about this distinction.
The PSLE marking scheme awards marks only for the correct scientific term, spelled correctly. Here are the words that students most commonly misspell, with the correct spelling you must memorise:
Use this structured plan to work through all 10 diagrams systematically:
Q: Will the exact same diagram appear in the PSLE every year?
Not the same diagram, but the same body parts and systems are tested repeatedly. The angle of the diagram or which specific parts are labelled may change, but the underlying structures — trachea, bronchi, alveoli, oesophagus, etc. — remain constant. Mastering the full label list for each system means you will be prepared for any variation.
Q: Can I use common names like "food pipe" or "windpipe" in my answer?
No. The PSLE marking scheme requires the correct scientific term. "Food pipe" is not accepted for "oesophagus", and "windpipe" is not accepted for "trachea". Always use the scientific name.
Q: How many marks are diagram labelling questions worth in PSLE?
In Booklet B, diagram labelling questions are typically 1 mark per label, with 3–6 labels per question. This makes them worth 3–6 marks per question set. In Booklet A, diagrams appear as part of multiple-choice questions where you must identify a labelled part — worth 2 marks per question. Together, diagram-based questions can account for 15–20 marks across the full paper.
Q: My child keeps confusing the same labels. What should we do?
Confusion between similar-sounding parts (such as bronchi and bronchioles, or stigma and stamen) is extremely common. The best fix is to create a simple contrast statement: "Bronchi are the big branches; bronchioles are the little branches." For stigma vs stamen: "Stamen = male (S for seed-producing); Stigma = sticky top of female part." Creating your own memory triggers for the pairs you confuse is more effective than re-reading definitions.