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

Free P3 Science SA2 Paper 1, HY3 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 3 Science From Real Exams Generated by Tencent HY3 Free Updated 2026-08-17
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Questions

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Answers

Answer Key - SA2 Practice Paper Version 1 (Primary 3 Science: Diversity)

Total Marks: 40

Section A (10 marks)

  1. B
    Teaching note: A cactus plant is living (needs air, water, food; grows). Toys, wood, plastic are non-living. Common mistake: choosing toy robot because it moves – movement by battery is not living.

  2. B
    Teaching note: Reproduction is a characteristic of living things. Softness, colour, size are not proof of life.

  3. C
    Teaching note: Insects have wings and six legs (3 body parts). Fish have fins/scales, birds have feathers, mammals have fur.

  4. B
    Teaching note: Mushroom is a fungus. Fern, grass, rose are plants.

  5. B
    Teaching note: Cotton is natural (from cotton plant). Plastic, glass, nylon are man-made.

  6. C
    Teaching note: Waterproof means water cannot pass through, keeping person dry.

  7. C
    Teaching note: Goldfish has scales and gills. Frog is amphibian, lizard reptile, sparrow bird.

  8. C
    Teaching note: Bacteria are microorganisms (living but tiny). Not plants, not insects, not non-living.

  9. C
    Teaching note: Glass is transparent (lets light through) for window. Wood/rubber/fabric not clear.

  10. A
    Teaching note: Teddy bear cannot grow by itself; it is non-living though it looks like a bear.

Section B (12 marks)

  1. (2 marks) Any two from: need air / need water / need food / grow / reproduce / respond to changes / move by themselves.
    Marking: 1 mark per correct characteristic.

  2. (2 marks) Living: rose, dog. Non-living: rock, spoon.
    Marking: 1 mark each list correct.

  3. (2 marks) Flexible (bends without breaking) OR waterproof (if treated).
    Teaching note: Rubber bends, good for soles to grip.

  4. (2 marks) Fungi do not make their own food like plants (or: fungi are not green, not plants).
    Marking: 1 mark for stating difference.

  5. (2 marks) Example: wood (from tree), leather (from animal skin), cotton (from plant).
    Marking: 1 mark name, 1 mark source.

  6. (2 marks) Metal is strong and conducts heat well, so it can be heated for cooking.
    Marking: 1 mark property, 1 mark use link.

Section C (18 marks)

  1. (3 marks)
    (a) Sparrow – Bird; Shark – Fish; Frog – Amphibian; Bee – Insect. (2 marks: 0.5 each)
    (b) None. (1 mark)
    Teaching note: Mammals have fur/hair and lungs; none in table.

  2. (4 marks)
    (a) Wooden desk, cotton towel. (1 mark)
    (b) Glass jar. (1 mark)
    (c) Plastic is waterproof / light / does not break easily, good for holding water. (2 marks: property + reason)

  3. (5 marks) Based on image_placeholder Q19-fig1: fish, water lily labelled living; stone, rubber duck non-living.
    (a) Fish, water lily. (2 marks)
    (b) Rubber duck cannot grow / not alive. (1 mark)
    (c) Has leaves/flowers, grows in water, makes food (any plant characteristic). (2 marks)

  4. (6 marks)
    (a) Steel. (1 mark: absorbs no water)
    (b) Steel is not flexible, heavy, not waterproof? Actually steel not waterproof? It does not absorb but is hard; answer: steel does not bend, is heavy, not suitable for clothing. (2 marks: property + reason)
    (c) Cloth for clothes / towel. (1 mark)
    (d) Paper absorbs ink / bends / light to carry. (2 marks: property + writing link)