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Primary 3 Science Semestral Assessment 2 (End of Year) Paper 5

Free P3 Science SA2 Paper 5, 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

Questions

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Answers

TuitionGoWhere Practice Paper - Science Primary 3 (SA2, Version 5) — Answer Key

Subject: Science | Level: Primary 3 | Paper: SA2 Version 5 (Diversity) | Total Marks: 45


Section A: Multiple Choice (8 marks)

1. (3) Raincoat 2. (1) The chilli plant needs water to survive. 3. (2) Bird 4. (3) Amphibian 5. (2) Mould is a living thing that is a type of fungus. 6. (4) Glass 7. (3) Plastic 8. (4) yeast — yeast is a living thing (a fungus), so it belongs in the living things group.


Section B: Short Answer (12 marks)

9. [2]

  • Living things: bread mould, chick, fern
  • Non-living things: glass marble, plastic spoon, rubber ball

10. [2]

  • A — S (dog drinks water: needs air, food and water)
  • B — P (kitten's weight increased: grows)
  • C — Q (mimosa leaf closes when touched: responds to changes)
  • D — R (hen's eggs hatched: reproduces)

11. [2]

  • Rabbit — mammal
  • Snake — reptile
  • Frog — amphibian

12. [2] Flowering plants: hibiscus, orchid (fern and moss are non-flowering plants.)

13.

  • (a) [1] Rubber
  • (b) [1] Glass — it breaks easily when bent.

14. [2] Natural materials: cotton, wool, leather (plastic, glass and nylon are man-made materials.)


Section C: Open-Ended Questions (25 marks)

15. [4] No, I do not agree with Ali. The balloon became bigger because air was blown into it, not because it grew on its own. A living thing must show the characteristics of life: it needs air, food and water, it can grow, respond to changes around it, and reproduce. The balloon cannot do any of these things, so it is a non-living thing. Becoming bigger when filled with air is not growth.

16. [4] (Award ½ mark per correct group, ½ mark per matching feature)

AnimalAnimal groupFeature used
WBirdIt has feathers and a beak.
XReptileIt has dry scales on its body.
YAmphibianIt has moist skin and can live in water and on land.
ZInsectIt has six legs, wings and antennae.

17. [4] Siti should stretch each piece of fabric over the same type of cup/jar. She should keep these the same: the size of each fabric piece, the amount (volume) of water used, the height from which the water is poured, and the same container. She should pour the same amount of water onto each fabric from the same height, one fabric at a time. She should then observe and measure the amount of water that collects inside the cup under each fabric. The fabric that lets the least (or no) water pass through is the most waterproof.

18.

  • (a) [1] Metal
  • (b) [2] Metal is strong, hard and stiff, so it can support the weight of a person without bending or breaking. Cardboard is weak and soft, so it bends and tears easily and cannot hold the weight.
  • (c) [1] The seat cushion/padding — a soft material such as foam or fabric makes the chair comfortable to sit on.

19.

  • (a) [1] X represents living things.
  • (b) [1] A — Non-flowering plants
  • (c) [1] B — Mammals; C — Amphibians
  • (d) [1] Any one of: fish, reptiles, insects

20.

  • (a) [2] Property 1: Glass is transparent, so light passes through and the guppies can be seen clearly. Property 2: Glass is waterproof / does not absorb water, so it can hold water without leaking or soaking it up.
  • (b) [2] Metal is strong and hard, so it can support the heavy weight of the glass tank and the water inside without bending or breaking. Cardboard is weak and soft, so it would collapse under the weight.
  • (c) [1] Fabric absorbs water / is not waterproof, so water would leak out or soak through the tank.

Marking totals: Section A: 8 | Section B: 12 | Section C: 25 | Grand Total: 45 marks