Primary 3 Science Systems Quiz

Primary 3 Science Quiz - Systems: Answer Key

Total Marks: 20
Topic: Systems (Living/Non-living, Materials, Magnets as systems)

Section A: Living and Non-Living Systems (Q1–10)

Q1. (b) cat [1 mark]
Teaching note: A cat is an animal that is living. Rocks, spoons and books are non-living. Living things need air, food and water.

Q2. rose ✓, dog ✓ [1 mark total; 0.5 each if split]
Teaching note: Rose is a plant (living). Dog is an animal (living). Table and cloud are non-living.

Q3. No. [1 mark]
Teaching note: A teddy bear is moved by a child, not by itself. Living things move by themselves. The teddy bear is non-living.

Q4. (b) it grows taller [1 mark]
Teaching note: Growth is a characteristic of living things. Green colour or softness can also be in non-living things.

Q5. Living: apple, fish, bird | Non-living: chair, pencil [1 mark]
Teaching note: Apple is from a plant (living), fish and bird are animals (living). Chair and pencil are made by people (non-living).

Q6. False [1 mark]
Teaching note: A balloon gets bigger because air is blown in, not because it grows like a living thing. Growth in living things happens from inside.

Q7. (b) boy [1 mark]
Teaching note: A boy is living and needs air, food and water. Cup, shoe and bag are non-living.

Q8. (b) fungus [1 mark]
Teaching note: Mushroom is a fungus, not a plant. Fungi are a different group of living things.

Q9. (b) living [1 mark]
Teaching note: Bacteria are tiny living things. They are not toys or rocks.

Q10. has feathers and wings → bird; has scales and lives in water → fish [1 mark]
Teaching note: Birds have feathers and wings. Fish have scales and breathe in water.

Section B: Materials in Systems (Q11–15)

Q11. (b) plastic [1 mark]
Teaching note: Plastic is waterproof, so rain cannot pass through. Good for raincoat.

Q12. wood ✓, cotton ✓ [1 mark total]
Teaching note: Wood comes from trees, cotton from plants (natural). Plastic and glass are man-made.

Q13. (b) light can pass through [1 mark]
Teaching note: Glass lets light pass, so we can see outside. That is why windows use glass.

Q14. (b) strong [1 mark]
Teaching note: Metal is strong and does not break easily, good for cups that hold hot drinks.

Q15. (c) nylon [1 mark]
Teaching note: Nylon is made by people (man-made). Wool, leather, tree rubber are natural.

Section C: Magnets and Forces in Systems (Q16–20)

Q16. (a) attract [1 mark]
Teaching note: Magnet pulls magnetic things towards it = attract. Push away = repel.

Q17. (b) iron and steel [1 mark]
Teaching note: Magnets attract iron and steel. They do not attract wood, plastic, paper, cloth, rubber, glass.

Q18. (b) repel [1 mark]
Teaching note: Like poles (N–N or S–S) repel. Unlike poles (N–S) attract.

Q19. (b) north–south [1 mark]
Teaching note: A freely hanging magnet always points north–south because of Earth’s magnetic field.

Q20. (b) refrigerator door [1 mark]
Teaching note: Many refrigerator doors use magnets to close tightly. Spoon, chair, book usually do not.