PSLE Science 2027: 30 I–II–III MCQs with Answers

A “Which statements are correct?” Science question asks pupils to judge each claim separately before selecting the option that lists the correct combination. A child can understand two true facts and still choose the wrong answer after overlooking a third statement containing only, always or a reversed scientific process. The reliable method is to mark Statement I, II and III as true or false from evidence, then select the option matching that exact pattern.

This guide contains 30 original multiple-statement MCQ exercises for Primary 6 Standard Science revision in 2027: fifteen problems containing Statements I and II, followed by fifteen with I, II and III. Every practice question has four possible answer combinations, and the article explains why each stated idea is correct or incorrect. This style trains careful reading and connected reasoning; it does not claim that SEAB will use a particular combination format in the confidential 2027 examination.

The verified revised Standard Science 0009 format from examinations in 2026 has 30 four-option MCQs in Booklet A worth 60 marks, along with 10–11 structured questions worth 40 marks in a single 105-minute paper. Foundation Science 0039 instead uses three-option MCQs with a separate format. This article is designed principally for Standard pupils, with the scientific concepts linked to the MOE P3–P6 syllabus and any Standard-only extensions clearly identified.

Step 1: read the context and identify the mechanism or measurement being tested.
Step 2: mark each statement true, false or uncertain before looking at the answer combinations.
Step 3: verify direction and conditions: evaporation versus condensation, food arrows, open paths and controlled tests.
Step 4: inspect strong words such as only, every, must, definitely and always.
Step 5: find the one answer combination matching the supported truth pattern.
Step 6: explain why one tempting wrong combination contains a false or omitted statement.
Step 7: practise the same logic with a changed diagram or scenario.
Exam caution: these are independent four-option training examples, not reproductions or predictions of official PSLE items.

Official references: MOE 2023 Primary Science Syllabus (updated May 2024), SEAB PSLE revised 2026 formats. Complementary practice: Booklet A: thirty ordinary four-option MCQs and answer elimination.

1. Decide each statement before looking at the choices

A multiple-statement question can feel more complicated than a conventional one-idea MCQ because it includes several claims. But the solution can be simpler if the pupil temporarily ignores the answer letters. Read Statement I and decide whether it follows from the described Science. Read Statement II independently. Where there is a third statement, evaluate it without being distracted by which combination looks familiar.

Consider an ordinary example: I. Plants respire during day and night. II. Plants photosynthesise in complete darkness. The first is true for living green plants; the second is false because photosynthesis requires light energy. After reaching those judgments, choose “I only”. Do not choose an option including both merely because both statements use plant vocabulary.

The same method works for data. If a cup cools from 80°C to 68°C, then “the temperature decreased by 12°C” is true. “The final temperature was 12°C” is false. A student who memorises the arithmetic without distinguishing a decrease from the ending value may incorrectly treat both as correct.

For a food web, evaluate each arrow and available food path. One statement may correctly identify a producer, another may incorrectly reverse a feeding arrow and a third may claim every predator must die when one prey declines. The student should use the specific diagram rather than a blanket statement about animals.

For circuits, judge whether the described source-to-bulb route is complete. An open switch in a single loop breaks that path. A switch in one branch of a parallel circuit may not break a different branch. Pupils should not mark both statements true merely because they refer to “open switches”.

For fair-test claims, identify all variables that differ. A statement saying the results were consistent across repeats can be true even when the experiment was unfair. A second statement saying the repeated unfair experiment isolated light from watering can be false. Reliability and fairness are different forms of quality.

Using scratch T/F marks is a preparation habit, not a requirement to write on the national answer sheet. A parent or tutor should check actual examination instructions about rough work and answer recording. In home practice, a tiny table with I, II, III and a tick or cross is enough.

The final selection requires matching the truth pattern to an option. Do not select “I and III” when Statement II is also true. Do not select “All three” when one contains a false absolute. The solution is a logical combination of independently evaluated scientific claims.

First decision	Example	Why it matters
Identify topic	Condensation versus evaporation	Avoid superficial keyword recognition
Read statement literally	“Only at night” versus “at night”	A qualifier can reverse truth
Check diagram	Series versus parallel path	Connections govern the prediction
Check data	Initial 80°C, final 68°C	Final value differs from 12°C decrease
Mark pattern	I true, II false	Choose the matching combination only
Explain error	II reverses the change of state	Correct reasoning, not letter memory

2. Five statement traps that often fool careful pupils

The first trap is an absolute word. “All insects have a pupal stage” is wrong, even though butterflies have a pupa. Grasshoppers have egg, nymph and adult stages. The pupil should evaluate the whole category rather than assume a familiar example represents every member.

The second trap is a reversed process. Evaporation and condensation both involve water changing state, but in opposite directions. Pollination and fertilisation are different stages of reproduction. Breathing and cellular respiration are related but not identical. A question can place these close concepts beside each other and ask which is correct.

The third trap is a quantity confusion. A taller graph value may represent a final temperature, a greater distance or a population count, depending on axis labels. A greater final value is not always a larger increase. A higher total water loss over forty minutes is not necessarily a faster rate than a smaller loss over ten minutes.

The fourth trap is missing a condition. In a simple circuit, a bulb can light with a complete conducting path and suitable source. But if a model asks about one branch of a parallel circuit, the pupil must trace the specific path rather than apply an oversimplified rule that any open switch makes everything dark.

The fifth trap is converting possibility to certainty. If a predator has several prey species, the decline of one prey might affect its food supply but does not prove all predators die. If a plant grew more in one setup while both water and light differed, the observations do not establish that light alone was responsible.

Students should also recognise the difference between false and unsupported. A claim might be scientifically possible but not supported by the experiment. When the MCQ says “Which statements are correct according to the information”, unsupported claims should not be included just because they could be true elsewhere.

Correction should explain the smallest difference that matters. “This statement was wrong because the arrow points from the organism eaten to the eater” is specific. “It was tricky” does not help the child answer the next unfamiliar question.

3. Fifteen original I–II Science MCQs

For Questions 1–15, use the same four combination choices: A. I only; B. II only; C. Both I and II; D. Neither I nor II. All statements are original teaching text. Choose before checking the answer key.