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Primary 3 Science Semestral Assessment 2 (End of Year) Paper 1

Free P3 Science SA2 Paper 1, Ox Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 3 Science From Real Exams Generated by Ox Alpha Updated 2026-08-27

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Questions

TuitionGoWhere Practice Paper - Science Primary 3

TuitionGoWhere Exam Practice (AI)

Assessment: SA2 Practice Paper — Theme:

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TuitionGoWhere Practice Paper - Science Primary 3

TuitionGoWhere Exam Practice (AI)

Assessment: SA2 Practice Paper — Theme: Diversity • Cycles • Systems • Interactions • Energy Name: ________ Class: ________ Date: ________ Time Allowed: 1 hour | Total Marks: 25

Instructions

Answer ALL questions.
Section A: Circle the correct option (1–4).
Section B: Write your answers in the spaces provided.
Marks for each question are shown in brackets [ ].

Section A: Multiple-Choice Questions (10 × 1 mark = 10 marks)

1. Which one of the following is a living thing? (1) rock (2) rain (3) fern (4) chair [1]

2. Mei Ling sorted some objects into two groups.

Group A: iron nail, steel spoon
Group B: plastic straw, rubber eraser

She sorted the objects according to whether they ___. (1) can float in water (2) are attracted to magnets (3) allow light to pass through (4) can be bent easily [1]

3. Which part of the plant absorbs water and mineral salts from the soil? (1) leaf (2) stem (3) root (4) flower [1]

4. Which one of the following animals has a three-stage life cycle? (1) butterfly (2) cockroach (3) mosquito (4) housefly [1]

5. Green plants need sunlight to make food. What else do they need to make food? (1) water and air (2) soil and air (3) water and soil (4) fertiliser and air [1]

6. Ravi shone a torch through three sheets of different materials and recorded what he saw on a screen behind each sheet.

Material P: no light reached the screen
Material Q: some light reached the screen
Material R: most light reached the screen

Which material is most suitable for making a car windscreen? (1) Material P (2) Material Q (3) Material R (4) None of the materials [1]

7. In which part of the digestive system does digestion begin? (1) mouth (2) stomach (3) gullet (4) small intestine [1]

8. Which one of the following objects is attracted to a magnet? (1) copper wire (2) aluminium foil (3) steel paper clip (4) plastic button [1]

9. A ball falls to the ground when it is dropped because of ___. (1) friction (2) gravity (3) magnetism (4) elasticity [1]

10. Which one of the following groups contains only non-living things? (1) moss, mushroom, mould (2) ruler, eraser, pencil case (3) fern, moss, hibiscus (4) ant, spider, beetle [1]

Section B: Open-Ended Questions (15 marks)

11. Ali found organism X on a rotting log. Over one week, he observed that X grew bigger, moved away when he touched it, and produced more organisms like itself. (a) State TWO characteristics of living things shown by X. [1] (b) Based on your answer in (a), is X a living thing? Give a reason for your answer. [1] (c) State ONE other characteristic of living things. [1] [3]

12. The life cycle of a mealworm beetle has four stages: egg → larva → pupa → adult. (a) A grasshopper also lays eggs. How many stages are there in the life cycle of a grasshopper? [1] (b) State ONE difference between a young grasshopper and an adult grasshopper. [1] (c) State ONE similarity between the life cycles of the mealworm beetle and the grasshopper. [1] [3]

13. A flowering plant has roots, a stem, leaves and flowers. (a) Name the plant part that holds the plant upright. [1] (b) Name the plant part that makes food for the plant. [1] (c) State the function of the roots. [1] [3]

14. Siti wants to sew a raincoat. (a) State ONE property the material must have to keep her dry. [1] (b) Explain why tissue paper is not suitable for making a raincoat. [1] (c) Give ONE reason why plastic is a suitable material for a raincoat. [1] [3]

15. David hung a bar magnet from a string so that it could swing freely. When it came to rest, he brought the north-seeking pole of another magnet near the north-seeking pole of the hanging magnet. (a) State the direction the hanging magnet pointed when it came to rest. [1] (b) What would David observe when he brought the two like poles together? [1] (c) David placed a sheet of paper between the magnet and a steel pin. The pin was still attracted to the magnet. Explain why. [1] [3]

— End of Paper —

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Answers

TuitionGoWhere Practice Paper - Science Primary 3 — Answer Key

Assessment: SA2 Practice Paper — Theme: Diversity • Cycles • Systems • Interactions • Energy

Section A: Multiple-Choice Questions (10 marks)

Q	Answer	Explanation
1	(3) fern	A fern is alive: it grows, responds to changes and reproduces.
2	(2) are attracted to magnets	Iron and steel are magnetic; plastic and rubber are not.
3	(3) root	Roots anchor the plant and absorb water and mineral salts.
4	(2) cockroach	Cockroach: egg → nymph → adult (3 stages). Butterfly, mosquito and housefly have 4 stages.
5	(1) water and air	Plants need sunlight, water and air (carbon dioxide) to make food.
6	(3) Material R	Most light passes through R, so it is transparent — best for a windscreen.
7	(1) mouth	Digestion begins in the mouth with the help of saliva.
8	(3) steel paper clip	Steel is a magnetic material.
9	(2) gravity	Gravity pulls objects towards the Earth.
10	(2) ruler, eraser, pencil case	They do not grow, reproduce or respond to changes.

Section B: Open-Ended Questions (15 marks)

11. (a) Any two: it grows; it moves/responds to touch; it reproduces. [1] (b) Yes. X shows characteristics of living things such as growth, response to changes and reproduction. [1] (c) Any one: needs food, water and air; respires; excretes; eventually dies. [1]

12. (a) Three stages (egg → nymph → adult). [1] (b) The young grasshopper (nymph) is smaller and has no wings; the adult has fully developed wings. [1] (c) Both life cycles begin with the egg stage / both young resemble their adults. [1]

13. (a) Stem. [1] (b) Leaves. [1] (c) Roots hold the plant firmly in the ground and absorb water and mineral salts from the soil. [1]

14. (a) It must be waterproof (does not allow water to pass through). [1] (b) Tissue paper allows water to pass through it, so Siti would get wet. [1] (c) Plastic is waterproof / flexible / lightweight. [1]

15. (a) It pointed in the north–south direction. [1] (b) The two like poles repelled each other; the hanging magnet swung away. [1] (c) Magnetic force can act through non-magnetic materials such as paper, so the magnet could still attract the steel pin. [1]

Total: 25 marks

Marking note: Award full credit for scientifically equivalent wording and reasonable alternative answers showing the same concept.