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Primary 3 Science Semestral Assessment 1 (Mid-Year) Paper 2

Free P3 Science SA1 Paper 2, Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 3 Science From Real Exams Generated by Claude Sonnet 4 Updated 2026-08-17
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Primary 3 Science SA1 Examination 2026

TuitionGoWhere Practice Paper - Version 2 ANSWER KEY

Duration: 75 minutes
Total Marks: 100

Section A: Multiple Choice Questions (25 marks)

QuestionAnswerTopic
1CDiversity of Living and Non-living Things
2CDiversity of Living and Non-living Things
3DDiversity of Materials
4CLife Cycles
5CPlant Systems
6BDiversity of Living and Non-living Things
7BDiversity of Materials
8CLife Cycles
9BPlant Systems
10CDiversity of Living and Non-living Things
11BDiversity of Materials
12BLife Cycles
13CPlant Systems
14CDiversity of Materials
15CLife Cycles
16BPlant Systems
17BDiversity of Materials
18BLife Cycles
19APlant Systems
20CDiversity of Materials
21CLife Cycles
22CPlant Systems
23CDiversity of Materials
24BLife Cycles
25CPlant Systems

Section B: Short Answer Questions (45 marks)

26. (4 marks)

(a) Grouping materials (2 marks):

  • Natural materials: Wooden table, Leather belt, Clay pot (1 mark)
  • Man-made materials: Glass vase, Iron nail, Rubber ball (1 mark)

Note: Accept reasonable variations. Clay is natural, but processed into a pot.

(b) Two items once part of living things (2 marks):

  • Wooden table (wood comes from trees) (1 mark)
  • Leather belt (leather comes from animal skin) (1 mark)

27. (6 marks)

(a) Type and example (2 marks):

  • Type: Insects that undergo incomplete metamorphosis (1 mark)
  • Example: Cockroach / Grasshopper / Cricket (1 mark)

(b) Type of metamorphosis (1 mark):

  • Incomplete metamorphosis

(c) Two differences from butterfly's life cycle (3 marks):

  • Difference 1: This life cycle has 3 stages while the butterfly has 4 stages. (1.5 marks)
  • Difference 2: This life cycle has no pupa stage while the butterfly has a pupa stage. (1.5 marks)
  • Accept: The nymph looks like the adult, but the caterpillar looks different from the butterfly.

28. (6 marks)

(a) Most absorbent material (1 mark):

  • Paper towel

(b) Why plastic sheet absorbed no water (2 marks):

  • Plastic is waterproof / not absorbent. (1 mark)
  • Water cannot pass through or be soaked up by plastic. (1 mark)

(c) Best material for cleaning spills and reason (3 marks):

  • Paper towel (1 mark)
  • It absorbed the most water (45 ml). (1 mark)
  • This means it can soak up spills quickly and effectively. (1 mark)

29. (6 marks)

(a) Matching parts to functions (2 marks):

FunctionPart (A, B, C or D)
Absorbs water and mineralsD
Makes food using sunlightB

(b) What happens if Part C (stem) is damaged (2 marks):

  • Water and minerals cannot be transported from the roots to the leaves. (1 mark)
  • The plant will wilt and may die because it cannot get water or make food. (1 mark)

(c) What Part A attracts and why (2 marks):

  • Insects / Bees / Butterflies (1 mark)
  • To help with pollination so the plant can produce seeds and reproduce. (1 mark)

30. (5 marks)

(a) Process when seed starts to grow (1 mark):

  • Germination

(b) Conditions provided for seed to grow (2 marks):

  • Water (by watering the plant) (1 mark)
  • Warmth (room temperature) (1 mark)
  • Accept: Air, Soil

(c) What flowers will develop into (2 marks):

  • Flowers will develop into fruits. (1 mark)
  • The fruits will contain seeds. (1 mark)

31. (5 marks)

(a) Missing stage for chicken (1 mark):

  • Adult chicken / Hen / Rooster

(b) Animal with incomplete metamorphosis and explanation (2 marks):

  • Chicken undergoes incomplete metamorphosis. (1 mark)
  • The chick looks like a smaller version of the adult chicken and gradually grows into an adult without a pupa stage. (1 mark)

Note: Some may argue frog also fits - accept with valid reasoning about 3 stages.

(c) Similarity and difference (2 marks):

  • Similarity: Both butterfly and chicken lay eggs. / Both start life as eggs. (1 mark)
  • Difference: Butterfly goes through 4 stages with complete metamorphosis, while chicken goes through 3 stages without major body changes. / Butterfly has a pupa stage but chicken does not. (1 mark)

32. (6 marks)

(a) Most flexible material (1 mark):

  • Rubber tube

(b) Two reasons rubber is used for tyres (2 marks):

  • Reason 1: Rubber is flexible and can bend without breaking. (1 mark)
  • Reason 2: Rubber can absorb shock from bumps on the road. / Rubber provides good grip on the road. (1 mark)

(c) Why glass is not good for children's water bottles (2 marks):

  • Glass is not flexible and will break easily if dropped. (1 mark)
  • Broken glass is sharp and can hurt children. (1 mark)

(d) One useful property of metal (1 mark):

  • Strong / Hard / Durable / Conducts heat / Conducts electricity

33. (7 marks)

(a) Organism that can make its own food and how (2 marks):

  • Mango tree can make its own food. (1 mark)
  • It uses sunlight, water and air to make food in its leaves (photosynthesis). (1 mark)

(b) One other thing living things need to survive (1 mark):

  • Air / Food / Shelter / Suitable temperature

(c) How mushroom gets food (2 marks):

  • Mushroom absorbs nutrients from dead or decaying matter. (1 mark)
  • It breaks down dead plants or animals to get food. (1 mark)

(d) Are mushrooms plants or animals (2 marks):

  • Mushrooms are neither plants nor animals (they are fungi). (1 mark)
  • Unlike plants, they cannot make their own food. Unlike animals, they cannot move from place to place. (1 mark)

Section C: Word Problems (30 marks)

34. (8 marks)

(a) Four stages of mealworm life cycle (2 marks):

  • Stage 1: Egg (0.5 mark)
  • Stage 2: Larva / Mealworm (0.5 mark)
  • Stage 3: Pupa (0.5 mark)
  • Stage 4: Adult beetle (0.5 mark)

(b) Type of metamorphosis (1 mark):

  • Complete metamorphosis

(c) Weeks in pupa stage and what happened (2 marks):

  • Weeks 5-6 (1 mark)
  • The mealworm's body changed inside the hard shell/pupa, transforming into an adult beetle. (1 mark)

(d) Why mealworm shed skin several times (2 marks):

  • The mealworm was growing larger. (1 mark)
  • The old skin could not stretch, so it had to shed it to continue growing. / This process is called moulting. (1 mark)

(e) Similarity to butterfly's life cycle (1 mark):

  • Both have 4 stages. / Both go through complete metamorphosis. / Both have egg, larva, pupa, and adult stages.

35. (8 marks)

(a) Grouping animals by young appearance (2 marks):

  • Young looks like adult: Elephant, Chicken (1 mark)
  • Young looks different from adult: Frog, Butterfly (1 mark)

(b) Why some animals go through metamorphosis (2 marks):

  • Different animals have different ways of growing and developing. (1 mark)
  • Metamorphosis allows the young to live in different environments or eat different food from adults. / It is how these animals adapt to survive. (1 mark)

(c) Changes visitors will see (3 marks):

  • First, tadpoles will hatch from the eggs. (1 mark)
  • The tadpoles will grow legs and their tails will get shorter. (1 mark)
  • Eventually, the tadpoles will become adult frogs that can live on land. (1 mark)

(d) Advantage of caterpillar looking different from adult butterfly (1 mark):

  • The caterpillar and butterfly can eat different food, so they do not compete with each other. / The caterpillar can hide from predators more easily on leaves.

36. (8 marks)

(a) What Mrs Wong was trying to find out (2 marks):

  • She wanted to find out what plants need to grow healthily. (1 mark)
  • Specifically, whether plants need light and water. (1 mark)

(b) Why Plant C had pale yellow leaves (2 marks):

  • Plant C did not receive sunlight. (1 mark)
  • Without sunlight, the plant could not make food properly and the leaves lost their green colour. / The plant could not produce chlorophyll. (1 mark)

(c) Comparison of Plant A and B (2 marks):

  • Plant A was healthy but Plant B wilted. (1 mark)
  • This shows that plants need water to survive. / Without water, plants will wilt and become unhealthy. (1 mark)

(d) How to test if plants need air (2 marks):

  • She should set up a plant with light and water but cover it with an airtight container to remove air. (1 mark)
  • Compare it with a plant that has light, water, and air to see the difference. (1 mark)

37. (6 marks)

(a) Grouping items by material (3 marks):

  • Paper/Cardboard: Old newspaper, Cardboard box (0.75 mark)
  • Metal: Empty drink can, Aluminium foil tray (0.75 mark)
  • Plastic: Plastic yogurt container (0.75 mark)
  • Glass: Glass jam jar (0.75 mark)

(b) Two reasons recycling is important (2 marks):

  • Reason 1: Recycling reduces waste in landfills / keeps the environment clean. (1 mark)
  • Reason 2: Recycling saves natural resources / We do not need to use as many new raw materials. (1 mark)
  • Accept: Reduces pollution / Saves energy

(c) Why wet paper cannot be recycled (1 mark):

  • Wet paper has damaged fibres that break apart easily. / Wet paper cannot be processed properly in recycling machines. / Wet paper can become mouldy.

Marking Summary

SectionMaximum Marks
Section A: MCQ25
Section B: Short Answer45
Section C: Word Problems30
Total100

End of Answer Key