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Primary 4 Science Semestral Assessment 2 (End of Year) Paper 4

Free P4 Science SA2 Paper 4, HY3 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Questions

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Answers

Answer Key — SA2 Practice Paper Version 4 (Primary 4 Science: Diversity)

Total Marks: 60

Section A (10 marks)

  1. C — Fern. Teaching note: A fern is a plant and is alive. Rock, cloud, water are non-living.
  2. C — Fungus. Teaching note: Mushrooms are fungi, not plants or animals.
  3. B — Can move by itself. Teaching note: Some living things (e.g. plants) do not move from place to place, but all need food, reproduce, and grow.
  4. B — Fish. Teaching note: Fish use gills to breathe underwater; others use lungs.
  5. B — Soil. Teaching note: Soil is non-living though it holds living organisms.
  6. A — Sunlight. Teaching note: Plants use sunlight to make food (photosynthesis, not required term but concept).
  7. B — Dolphin. Teaching note: Dolphin is a mammal; shark is fish, penguin is bird, crocodile is reptile.
  8. B — It does not grow or die. Teaching note: Non-living things do not show life processes.
  9. B — Water. Teaching note: Water is in living and non-living things but is not alive itself.
  10. A — Insect. Teaching note: Butterfly has 3 body parts and 6 legs = insect.

Section B (12 marks)

  1. [2] Living thing grows / needs food / reproduces (any one correct difference). e.g. “A living thing can grow.”
  2. [2] Any two: plants, animals, fungi, bacteria (e.g. plants and animals). 1 mark each.
  3. [2] Car does not eat, grow, reproduce, or breathe; it is made by humans and is non-living. (2 pts for clear reason)
  4. [2] Any two: moves, eats, breathes, reproduces, has senses. 1 mark each.
  5. [2] Example: mushroom; found on damp wood / soil. 1 mark example, 1 mark location.
  6. [2] Tree is living because it grows, needs water/sunlight, and can make food / reproduce (any 2 linked ideas).

Section C (28 marks)

  1. (a) [2] Living: rose, dog; Non-living: stone, wind. (1 mark living pair, 1 mark non-living pair) (b) [2] Stone is non-living because it does not grow, breathe, or reproduce. (c) [2] Shared characteristic: both need food / grow / reproduce (e.g. both are alive).
  2. (a) [3] Plants, animals, fungi (1 mark each). (b) [3] e.g. rose, cat, mushroom (1 mark each). (c) [3] Plant: makes food; Animal: moves/eats; Fungus: absorbs food / grows on decay (1 mark each).
  3. (a) [2] Lily, fish (or frog). 1 mark each from image labels. (b) [2] Sun, water, rock, air (any two). 1 mark each. (c) [2] Fish is living because it breathes, moves, and eats.
  4. (a) [2] Diversity means the variety of living things in nature. (b) [2] Keeps balance, provides food/oxygen, protects ecosystem (any two). (c) [2] Protect habitats, do not litter, plant trees (any one clear action).

Marking notes: Deduct for wrong group names; accept local synonyms (e.g. “bug” for insect only if clarified). MCQ wrong = 0.