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

Free P3 Science SA1 Paper 1, 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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Answers

Primary 3 Science SA1 Examination 2026

TuitionGoWhere Practice Paper - ANSWER KEY

Duration: 75 minutes
Total Marks: 100

Section A: Multiple Choice Questions (25 marks)

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

Section B: Short Answer Questions (45 marks)

26. (4 marks)

(a) Table completion (2 marks - 0.5 mark each):

OrganismLiving or Non-living?
CoralLiving
SeaweedLiving
Seashell (empty)Non-living
CrabLiving

(b) Reason why coral is classified as a living thing (2 marks):

  • Coral can grow. (1 mark)
  • Coral can reproduce. (1 mark)
  • Accept: Coral needs food/water/air to survive / Coral responds to changes in its surroundings

27. (6 marks)

(a) TWO transparent or translucent items (2 marks):

  • Plastic cup and glass jar

(b) Most flexible item (1 mark):

  • Rubber eraser

(c) Item not to use and reason (3 marks):

  • Should NOT use the metal spoon (1 mark)
  • Metal is a good conductor of heat (1 mark)
  • The spoon will become very hot and may burn her hand (1 mark)

28. (6 marks)

(a) Names of stages (4 marks - 1 mark each):

  • Stage A: Egg
  • Stage B: Caterpillar / Larva
  • Stage C: Pupa / Chrysalis
  • Stage D: Adult butterfly

(b) Stage that eats the most food and reason (2 marks):

  • Stage B / Caterpillar stage (1 mark)
  • The caterpillar needs to eat a lot of food to store energy for the pupa stage when it cannot eat. / It needs nutrients to grow and develop into an adult butterfly. (1 mark)

29. (6 marks)

(a) Names of parts (2 marks - 0.5 mark each):

  • Part W: Flower
  • Part X: Leaves
  • Part Y: Stem
  • Part Z: Roots

(b) Part that makes food (1 mark):

  • Leaves / Part X

(c) How water travels from soil to leaves (3 marks):

  • The roots absorb water from the soil. (1 mark)
  • The water is transported up through the stem. (1 mark)
  • The water reaches the leaves where it is used to make food. (1 mark)

30. (5 marks)

(a) Waterproof materials (1 mark):

  • Plastic bag and raincoat fabric

(b) Importance of waterproof raincoats (2 marks):

  • To keep the person dry when it rains. (1 mark)
  • Water cannot pass through the material, so it protects the person from getting wet. (1 mark)

(c) Why newspaper is not good for umbrella (2 marks):

  • Newspaper absorbs water / is not waterproof. (1 mark)
  • It will become wet and tear easily when it rains. (1 mark)

31. (5 marks)

(a) Difference from butterfly's life cycle (2 marks):

  • The cockroach has 3 stages (egg → nymph → adult) while the butterfly has 4 stages (egg → larva → pupa → adult). (1 mark)
  • The cockroach does not have a pupa stage. (1 mark)

(b) Type of metamorphosis (1 mark):

  • Incomplete metamorphosis

(c) Similarity and difference (2 marks):

  • Similar: The nymph looks like a smaller version of the adult cockroach. / Both have similar body shape. (1 mark)
  • Different: The nymph is smaller and does not have fully developed wings. / The nymph cannot reproduce. (1 mark)

32. (6 marks)

(a) Conditions for germination (2 marks):

  • Water (1 mark)
  • Warmth / suitable temperature (1 mark)
  • Accept: Air/oxygen

(b) What happens when a seed germinates (2 marks):

  • The seed absorbs water and swells. (1 mark)
  • A tiny root grows out of the seed first, followed by a shoot. (1 mark)
  • Accept: The seed coat breaks open / The seedling emerges

(c) Reason for placing pot near window (2 marks):

  • So that the plant can receive sunlight. (1 mark)
  • Sunlight is needed for the plant to make food through photosynthesis. / Sunlight is needed for the plant to grow healthily. (1 mark)

33. (7 marks)

(a) Venn diagram completion (5 marks):

Butterfly OnlyBothChicken Only
Goes through 4 stagesLays eggsHas feathers
Undergoes complete metamorphosisHas wingsGoes through 3 stages
Young looks like adult

(1 mark for each correctly placed characteristic - up to 5 marks)

(b) Another similarity (2 marks):

  • Both need air, water and food to survive. (1 mark)
  • Both can reproduce / Both are living things / Both can grow. (1 mark)
  • Accept: Both have wings

Section C: Word Problems (30 marks)

34. (8 marks)

(a) Strongest and weakest materials (2 marks):

  • Strongest: Rubber strip (1 mark)
  • Weakest: Paper strip (1 mark)

(b) Best material for shopping bag and explanation (3 marks):

  • Rubber strip or Plastic strip (1 mark)
  • Rubber/Plastic can hold more weights without breaking. (1 mark)
  • This means it is strong enough to carry heavy items without tearing. (1 mark)

(c) Property of rubber (1 mark):

  • Flexibility / Elasticity / Stretchability

(d) Two reasons why paper bags are still used (2 marks):

  • Paper is biodegradable / better for the environment. (1 mark)
  • Paper bags are cheaper to produce. / Paper bags can be recycled easily. / Paper bags are made from natural materials. (1 mark)

35. (8 marks)

(a) Name of creature that hatches from frog's egg (1 mark):

  • Tadpole

(b) Why frog eggs need to be in water (2 marks):

  • Frog eggs do not have hard shells and will dry out if not in water. (1 mark)
  • The tadpoles that hatch breathe through gills and need water to survive. (1 mark)

(c) Two changes during development (2 marks):

  • Change 1: The tadpole develops legs. / Legs grow. (1 mark)
  • Change 2: The tail becomes shorter and disappears. / Gills are replaced by lungs. / It develops lungs to breathe air. (1 mark)

(d) Similarity and difference with chicken's life cycle (3 marks):

  • Similarity: Both frog and chicken lay eggs. / Both go through 3 stages. (1 mark)
  • Difference: The young frog (tadpole) looks different from the adult frog, but the young chicken (chick) looks similar to the adult chicken. (2 marks)
  • Accept: Frog eggs are laid in water while chicken eggs are laid on land. / Tadpoles live in water while chicks live on land.

36. (8 marks)

(a) Part of carrot we eat and its function (2 marks):

  • Part we eat: Root (1 mark)
  • Function: To absorb water and minerals from the soil. / To anchor the plant in the ground. / To store food. (1 mark)

(b) Reason for yellow leaves (2 marks):

  • The plant may not be getting enough sunlight. (1 mark)
  • Without enough sunlight, the plant cannot make food properly and the leaves turn yellow. (1 mark)
  • Accept: Lack of nutrients in soil / Overwatering / Disease

(c) Prediction for seedlings in dark storeroom (2 marks):

  • The seedlings will become weak, pale/yellow, and may die. (1 mark)
  • This is because they cannot get sunlight to make food. (1 mark)
  • Accept: The seedlings will grow tall and thin trying to reach light / etiolation

(d) Another way to grow new tomato plants (2 marks):

  • He can cut a healthy stem from the tomato plant. (1 mark)
  • Plant the stem cutting in soil and it will grow roots and become a new plant. (1 mark)
  • Accept: Using runners / Using grafting / Vegetative propagation

37. (6 marks)

(a) Classification table (3 marks - 0.5 mark each):

ItemClassification
Wooden deskOnce-living
Potted plantLiving
Metal chairNon-living
Cotton curtainsOnce-living
Class pet hamsterLiving
Leather shoeOnce-living

(b) Why wooden desk is "once-living" (2 marks):

  • Wood comes from trees, which were once living things. (1 mark)
  • The wood was part of a living tree before it was cut down and made into a desk. (1 mark)

(c) Example of something never alive (1 mark):

  • Accept any valid answer: Metal chair / Glass window / Plastic ruler / Metal scissors / Ceramic tiles / Rock paperweight / Whiteboard marker (metal/plastic parts)

Marking Summary

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

End of Answer Key