Wait, What? A New Diagram Does Not Always Mean a New Experiment
Multi-part PSLE Science questions often reveal a set-up in stages. One diagram may show the starting arrangement. A later diagram may show what happens after time passes. Another may show one component changed. Sometimes the later picture is a completely new set-up. Sometimes it is the same system continuing. Sometimes it is the same system with one deliberate modification.
If you cannot tell which of those jobs the later diagram is doing, conditions and evidence start leaking between states. You may keep a condition that no longer applies, reset an object that is actually the same specimen, or treat a replacement set-up as though it inherited every result from the earlier one.
BEFORE REASONING FROM A LATER DIAGRAM, DECIDE WHAT HAS CONTINUED, WHAT HAS CHANGED AND WHAT HAS BEEN REPLACED.
Quick Answer
Use this route whenever a later diagram appears:
READ THE CAPTION AND CONNECTING TEXT → MATCH OBJECT LABELS → CHECK WHETHER TIME HAS PASSED → CHECK WHETHER THE QUESTION SAYS “NOW”, “THEN”, “NEXT”, “ANOTHER” OR “REPLACED” → IDENTIFY PARTS THAT PERSIST → IDENTIFY DELIBERATE MODIFICATIONS → DROP CONDITIONS THAT NO LONGER APPLY → CARRY FORWARD ONLY VALID HISTORY → REBUILD THE CURRENT SCIENTIFIC STATE → ANSWER THE NEW JOB.
The Exact PSLE Science Learning Job This Guide Owns
This guide owns one learner job: deciding whether a later diagram in a multi-part PSLE Science question represents continuation, modification or replacement, then preserving the correct object identity, conditions and evidence history.
It does not own generic diagram reading, rotated views, photographs, time graphs or the scientific concept shown in the set-up. Those have separate owners. This page is about state continuity across successive diagrams.
Why This Matters for Current PSLE Science
SEAB’s 2026 PSLE Science syllabus states that candidates may apply knowledge and scientific inquiry using words, diagrams, tables and graphs, including interpreting and analysing information and communicating explanations and reasoning. The 2023 Primary Science syllabus likewise treats scientific inquiry as working with evidence and representations, not merely recalling isolated facts.
A diagram is therefore not decoration. It is part of the evidence state. When the diagram changes, the learner must work out whether the scientific system changed, the representation changed, or both.
Three Possible Jobs of a Later Diagram
| Later diagram job | What usually continues? | What must be rebuilt? |
|---|---|---|
| Continuation | Same object/set-up and relevant earlier conditions | Current state after time/process |
| Modification | Most of the original system and history | The changed component or condition and its downstream effects |
| Replacement | Only information explicitly shared between cases | New object identities, starting conditions and evidence state |
Worked Example 1 — Same Set-Up, Later Time
An original diagram shows a container, a specimen and a measuring instrument at the start. A later diagram is labelled “after 20 minutes” and shows the same labels with a changed reading.
The strongest default interpretation is continuation: the same set-up has been observed later. The starting conditions and specimen history remain relevant unless the question states that something was reset or replaced.
The learner should not treat the second diagram as a new trial merely because it is drawn separately on the page.
Worked Example 2 — One Component Is Deliberately Changed
A first diagram shows Set-Up P. The question then says, “The student changed the position of the lamp as shown below,” followed by a second diagram.
This is a modification. The learner should preserve the identity of the specimen and unchanged apparatus, but update the lamp position from the moment the change occurs. If the question later asks about the response, the explanation must connect the modified condition to the relevant mechanism and observed outcome.
Do not erase the earlier history. The specimen may carry a state produced before the modification.
Worked Example 3 — A New Set-Up Replaces the Earlier One
The question says, “In a second investigation, the student used the apparatus shown below.” Even if the new diagram looks similar, the wording signals replacement. The learner must identify which conditions are newly given rather than assuming every starting value and result from the first investigation carries forward.
A similar drawing does not establish shared history.
Worked Example 4 — The Drawing Changes but the Science Does Not
A later diagram may redraw the same circuit, container or organism from a clearer angle. If the labels, connections and stated time show the same scientific state, the representation may have changed without the system changing.
This is why visual movement on the page is not automatically physical movement in the system.
Worked Example 5 — A New Diagram Can Add Information Without Replacing the Old One
Sometimes a second diagram is a zoomed-in view of one part of the first set-up. The learner should preserve the whole-system identity while using the new view to add local evidence about that component. Do not treat the inset as a separate object unless the question says it is.
Build a Continuity Map
In practice, use a small table:
| Feature | Earlier diagram | Later diagram | Status |
|---|---|---|---|
| Specimen | P | P | Continues |
| Container | A | A | Continues |
| Light position | 20 cm | 40 cm | Modified |
| Temperature | Given | Not stated again | Carry forward only if the text says conditions remain the same |
| Measured result | Starting value | Later value | New evidence |
You do not need to draw this table in the examination. It is a practice scaffold for learning how state travels.
Do Not Carry a Condition Forward Just Because It Was True Earlier
A condition can belong to one time state only. If the question says the lid was removed, the later set-up is no longer closed. If a specimen was transferred to a new container, the old container conditions do not automatically remain. If an apparatus was replaced, the measurement method may also have changed.
Ask: Is this condition still active now?
Do Not Reset a Continuing Object
The opposite error is equally serious. A learner sees a fresh drawing and imagines the specimen has returned to its initial state. But if the same object has already been heated, cooled, exposed, moved, stretched, watered or otherwise changed, that history may matter to the later state.
Same object + later time usually means the object carries its previous state forward unless the question gives a reset.
The PSLE Science Reasoning Chain
READ GIVEN INFORMATION → IDENTIFY THE SCIENTIFIC OBJECT → MAP EARLIER TO LATER REPRESENTATIONS → DISTINGUISH CONTINUATION, MODIFICATION AND REPLACEMENT → SEPARATE OBSERVATION FROM INFERENCE → SELECT THE RELEVANT CONCEPT → EXPLAIN THE CAUSAL MECHANISM → CONNECT TO THE CURRENT CONDITION → STATE THE OUTCOME → CHECK AGAINST THE CURRENT EVIDENCE STATE.
Observable Failure Signatures
| Failure signature | Likely weak link |
|---|---|
| Every new diagram is treated as a new trial | Page layout confused with system identity |
| An earlier condition is used after the diagram explicitly changes it | Condition not updated |
| A continuing specimen is assumed to return to its starting state | History reset without evidence |
| A second investigation inherits the first investigation’s results | Replacement treated as continuation |
| A zoomed-in inset is counted as another object | Representation mistaken for new identity |
| The learner explains the later result before identifying what changed | Mechanism selected before state reconstruction |
Find the Earliest Weak Link
- What does the connecting sentence say happened?
- Is this the same investigation or a second one?
- Which labels identify the same object or component?
- Has time passed?
- Was anything deliberately changed, moved, removed, added or replaced?
- Which earlier conditions still apply?
- Which earlier results belong to the same object history?
- What new evidence appears in the later diagram?
- What is the current sub-question asking me to do with this state?
Misconception Repair — “A New Picture Means a New Set-Up”
Not necessarily. Wordings such as “after”, “then”, “next” and “the same set-up” often signal continuity. Read the text before deciding what the page break means.
Misconception Repair — “Same Labels Mean Nothing Changed”
The same object can experience a new condition. Identity and state are different. Preserve the object while updating the changed condition.
Misconception Repair — “If One Part Changes, Everything Else Must Be Re-read as New”
A modification can be local. Keep unchanged parts and conditions unless the change could scientifically affect them. This is why system boundaries and causal pathways matter.
Practice Protocol: Match → Mark → Rebuild
- Match: draw arrows between the same objects in earlier and later diagrams.
- Mark: label each feature SAME, CHANGED, ADDED, REMOVED or UNKNOWN.
- Time-tag: write START, LATER or NEW INVESTIGATION.
- Carry: preserve only conditions that still apply.
- Rebuild: describe the current set-up in one sentence.
- Reason: apply the relevant scientific mechanism.
- Check: make sure the answer uses evidence from the correct state.
Unfamiliar Transfer Challenge
Create three pairs of original diagrams:
- same set-up at a later time;
- same set-up with one component changed;
- a replacement set-up for a second investigation.
Swap the labels and positions so visual similarity does not give away the answer. For each pair, write which facts carry forward and which must be rebuilt.
Delayed Independent Return
Several days later, choose a multi-part Science question with more than one representation. Before solving the final part, explain aloud: “This diagram is a continuation/modification/replacement because…” Then list the current conditions without looking back at your notes.
State-Continuity Receipt
- I identified whether the later diagram continues, modifies or replaces the earlier set-up.
- I matched the scientific objects across diagrams.
- I preserved relevant history for continuing objects.
- I removed conditions that no longer apply.
- I did not invent a reset.
- I did not transfer old results into a genuinely new investigation.
- I separated a new viewpoint from a new scientific state.
- I answered using the current evidence state.
Parent and Tutor Teaching Guide
Before discussing the Science concept, ask the learner to narrate the continuity: “What is the same object? What changed? What happened between the pictures?” If the learner cannot answer those questions, concept explanation will attach to an unstable representation.
Use transparent paper, tracing, or simple arrows on a printed practice sheet to match continuing objects. Then gradually remove the scaffold and ask the learner to perform the mapping mentally.
When the learner carries a condition forward incorrectly, ask, “Where in the later state is that condition still guaranteed?” When the learner resets a specimen, ask, “What evidence says this object returned to its starting state?”
Useful Internal Routes
- PSLE Science Learning Guide
- Keep a starting set-up separate from later results
- Track a specimen when it moves between set-ups
- Tell a different view from a later stage
- Next guide: check whether a method improvement creates a new flaw
Authoritative References
- SEAB — PSLE Science syllabus, for examination from 2026
- MOE — Science Teaching & Learning Syllabus, Primary, 2023
Evidence and Boundary Note
The words continuation, modification and replacement are eduKate learning labels, not official marking phrases. Use them in practice to reconstruct the scientific state. In an examination answer, respond to the actual task and evidence supplied.
The Quiet Return
A later diagram is a new picture. It is not automatically a new world.
Find what survives, find what changed, rebuild the current state—and only then let the Science move forward.
