What topics appear most in PSLE Science?

The most tested topics in PSLE Science are: Forces & Simple Machines, Electrical Systems, Plants (Photosynthesis & Transport), Reproduction, Living & Non-Living Things, and the Water Cycle.

How many questions are in the PSLE Science paper?

The PSLE Science paper has two sections: Section A with 28 MCQ questions (2 marks each = 56 marks) and Section B with open-ended questions (44 marks), totalling 100 marks.

PSLE Science Questions with Answers 2026

PSLE Science Questions with Answers PDF

Comprehensive PSLE Science questions with full worked answers and explanations — covering all 15 examinable topics. Practise exactly how you'll be tested. No sign-up. Completely free.

✅ 200+ Questions 📖 Full Explanations 🎯 Section A & B Format 🇸🇬 MOE 2026 Aligned

PSLE Science Paper Structure

Before practising, understand exactly how the real paper is marked. This helps you allocate time and effort correctly.

Section	Question Type	No. of Questions	Marks	Time Tip
Section A	Multiple-Choice Questions (MCQ)	28 questions	56 marks	~30 mins — 1 min per question
Section B	Open-Ended (OEA) — short & structured answers	~12–15 sub-questions	44 marks	~55 mins — read carefully
Total	100 marks	1 hour 45 minutes

Section

Question Type

No. of Questions

Marks

Time Tip

Section A

Multiple-Choice Questions (MCQ)

28 questions

56 marks

~30 mins — 1 min per question

Section B

Open-Ended (OEA) — short & structured answers

~12–15 sub-questions

44 marks

~55 mins — read carefully

Total

100 marks

1 hour 45 minutes

💡 Exam Tip: Section B OEA questions require complete sentences with keywords. Examiners look for specific scientific terms — vague answers lose marks even if the idea is correct. Use our PSLE topic pages to learn the exact key phrases.

📝 Sample Questions

PSLE Science Questions with Model Answers

Click each question to reveal the model answer and examiner tips. These are written to match the actual PSLE marking standards.

Q1 MCQ A student sets up a circuit with a battery, two bulbs connected in series, and a switch. When the switch is opened, what happens to the bulbs? +

📋 Answer Choices

A) Both bulbs remain lit
B) Only one bulb goes off
C) Both bulbs go off
D) The brighter bulb stays on

✅ Correct Answer: C — Both bulbs go off

🧠 Explanation: In a series circuit, there is only ONE path for current to flow. When the switch is opened, the circuit is broken and no current can flow at all. Therefore, ALL components (both bulbs) stop working. This is different from a parallel circuit where other branches continue to work.

Q2 OEA A plant was placed in a dark room for 48 hours. An iodine solution test was then done on a leaf. State the result and explain why. (2 marks) +

✏️ Model Answer

The leaf will turn brown/orange when iodine is added. This is because in the dark, the plant cannot carry out photosynthesis (as light is a necessary condition). Without photosynthesis, no new starch is produced. The existing starch in the leaf is broken down and used up during respiration over the 48 hours.

✅ Key marks: Result stated (1) + Reason with keyword "photosynthesis"/"light" (1)

⚠️ Common mistake: Many students say "the plant has no food" — this is too vague. Always use the keyword photosynthesis and state that light is needed as a condition.

Q3 MCQ Which of the following is an example of a non-contact force? +

📋 Answer Choices

A) Friction between a car's tyre and road
B) Gravitational force on a falling apple
C) Push of a hand on a door
D) Pull of a rope on a bucket

✅ Correct Answer: B — Gravitational force on a falling apple

🧠 Explanation: Non-contact forces act at a distance without physical touch. The three non-contact forces in the PSLE syllabus are: Gravitational force, Magnetic force, and Electrostatic force. Friction, push, and pull all require physical contact.

Q4 OEA Describe how water moves from the roots of a plant to its leaves. Name the structure involved. (3 marks) +

✏️ Model Answer

Water is absorbed by the root hair cells from the soil (1 mark). The water then moves upward through the xylem vessels — tube-like structures found in the stem and leaves (1 mark). Water is eventually lost through tiny pores called stomata on the leaves by the process of transpiration, which creates a "pull" that draws more water up from the roots (1 mark).

✅ Keywords needed: root hair cells, xylem, stomata/transpiration

💡 Remember: Xylem carries water and minerals (upward). Phloem carries food/sugar (up and down). Don't mix them up!

Q5 MCQ In a food chain: Grass → Grasshopper → Frog → Snake. The grasshopper is best described as a: +

📋 Answer Choices

A) Producer
B) Primary consumer
C) Secondary consumer
D) Decomposer

✅ Correct Answer: B — Primary consumer

🧠 Explanation: In a food chain, the producer makes its own food (grass). The organism that eats the producer directly is the primary consumer (grasshopper). The one that eats the primary consumer is the secondary consumer (frog), and so on.

Q6 OEA A scientist wants to test whether fertiliser affects the growth of a plant. Describe how a fair test can be set up. (3 marks) +

✏️ Model Answer

Set up two identical plants of the same species and age in identical pots with the same type and amount of soil (1 mark). Give Plant A a fixed amount of fertiliser and Plant B no fertiliser (the variable being tested) (1 mark). Keep all other conditions the same: same amount of water, same amount of sunlight, same temperature and location (1 mark). Measure and compare the growth (e.g., height) after a fixed period.

✅ Key marks: Control variable stated + changed variable + measured outcome

💡 Fair Test Formula: Change ONE variable → Keep everything else the SAME → Measure the result. Practice more at our Fair Test builder.

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PSLE Science Questions with Answers PDF

PSLE Science Paper Structure

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