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Primary 3 Science Semestral Assessment 1 (Mid-Year) Paper 4
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Questions
Primary 3 Science SA1 Examination 2026
TuitionGoWhere Practice Paper - Version 4
Duration: 75 minutes
Total Marks: 100
Name: _________________________ Class: _______ Date: _________
Section A: Multiple Choice Questions (25 marks)
Choose the correct answer and write the letter (A, B, C, or D) in the brackets provided. Each question is worth 1 mark.
1. Which of the following needs food, water and air to survive?
(A) Robot
(B) Fish
(C) Computer
(D) Car
( )
2. A caterpillar is the __________ stage of a butterfly.
(A) egg
(B) larva
(C) pupa
(D) adult
( )
3. Which material is the MOST suitable for making a cooking pot handle?
(A) Metal
(B) Glass
(C) Plastic
(D) Paper
( )
4. Which of the following statements about roots is TRUE?
(A) Roots make food for the plant
(B) Roots absorb water and minerals from the soil
(C) Roots produce seeds
(D) Roots attract insects
( )
5. Silk is a natural material that comes from __________.
(A) plants
(B) rocks
(C) animals
(D) factories
( )
6. Which of the following is a characteristic of ALL living things?
(A) Can fly
(B) Have legs
(C) Need water
(D) Can make sound
( )
7. The life cycle of a beetle has how many stages?
(A) 2
(B) 3
(C) 4
(D) 5
( )
8. Which part of a plant is usually colourful to attract pollinators?
(A) Root
(B) Stem
(C) Leaf
(D) Flower
( )
9. Styrofoam is a __________ material.
(A) natural
(B) man-made
(C) living
(D) once-living
( )
10. During the pupa stage, a caterpillar __________.
(A) eats a lot of leaves
(B) transforms into a butterfly
(C) lays eggs
(D) flies around
( )
11. Which of the following groups contains items made from once-living things?
(A) Plastic chair, metal fork, glass cup
(B) Wooden table, cotton shirt, leather bag
(C) Rubber tyre, ceramic bowl, nylon rope
(D) Stone statue, iron gate, steel scissors
( )
12. A froglet is a __________.
(A) young frog with a tail
(B) type of fish
(C) baby tadpole
(D) frog's egg
( )
13. Why do plant stems grow upwards?
(A) To escape from insects
(B) To reach sunlight for making food
(C) To absorb more water
(D) To hide from animals
( )
14. Which property makes aluminium foil useful for wrapping food?
(A) Transparency
(B) Ability to block light and air
(C) Absorbency
(D) Flexibility only
( )
15. Which animal's young can survive on land immediately after hatching?
(A) Frog
(B) Fish
(C) Chicken
(D) Mosquito
( )
16. The Venus flytrap is special because it __________.
(A) does not need sunlight
(B) can trap and digest insects
(C) does not have roots
(D) can move from place to place
( )
17. Which of the following is a good electrical conductor?
(A) Wood
(B) Rubber
(C) Copper
(D) Plastic
( )
18. How is incomplete metamorphosis different from complete metamorphosis?
(A) It has more stages
(B) It does not have a pupa stage
(C) The young lives in water
(D) It takes longer
( )
19. What happens to seeds that do not receive water?
(A) They will germinate faster
(B) They will not germinate
(C) They will grow into stronger plants
(D) They will produce flowers
( )
20. Ceramics are made from __________.
(A) metals
(B) clay
(C) plastic
(D) wood
( )
21. Which stage is missing from this life cycle: Egg → ? → Adult grasshopper
(A) Caterpillar
(B) Tadpole
(C) Pupa
(D) Nymph
( )
22. Which part of the plant transports water from roots to leaves?
(A) Flower
(B) Stem
(C) Fruit
(D) Seed
( )
23. Why are plastic bags a concern for the environment?
(A) They are too expensive
(B) They take a very long time to break down
(C) They are too heavy
(D) They dissolve in water
( )
24. A mosquito larva is also called a __________.
(A) nymph
(B) wriggler
(C) caterpillar
(D) maggot
( )
25. Plants release __________ into the air during the day.
(A) carbon dioxide
(B) oxygen
(C) nitrogen
(D) smoke
( )
Section B: Short Answer Questions (45 marks)
Answer all questions in the spaces provided.
26. Look at the living things below and answer the questions. (4 marks)
| Living Thing | Can make own food? | Can move from place to place? |
|---|---|---|
| Rose plant | Yes | No |
| Butterfly | No | Yes |
| Mushroom | No | No |
| Fish | No | Yes |
(a) Which living thing can make its own food? How does it do this? (2 marks)
(b) Both mushroom and rose plant cannot move from place to place. Give ONE way they are different. (1 mark)
(c) What do all four living things have in common? (1 mark)
27. The table shows properties of four materials. (6 marks)
| Material | Floats on water | Conducts heat | Transparent |
|---|---|---|---|
| Wood | Yes | No | No |
| Iron | No | Yes | No |
| Glass | No | No | Yes |
| Cork | Yes | No | No |
(a) Which TWO materials would float if dropped into a pond? (1 mark)
(b) A chef wants a spoon to stir hot soup. Based on the table, which material should NOT be used? Why? (2 marks)
(c) Which material would be best for a submarine window? Explain using information from the table. (2 marks)
(d) Why does cork float on water while iron sinks? (1 mark)
28. Study the life cycle of an insect below. (6 marks)
Stage 1: Small white eggs laid on leaves
↓
Stage 2: Small worm-like creature eating leaves
↓
Stage 3: Hard brown case hanging from branch
↓
Stage 4: Insect with colourful wings
(a) What insect is this? (1 mark)
(b) Name each stage of the life cycle. (2 marks)
Stage 1: _____________ Stage 2: _____________
Stage 3: _____________ Stage 4: _____________
(c) During which stage does the insect change its body structure completely? (1 mark)
(d) Why does the insect eat a lot during Stage 2? (2 marks)
29. The diagram shows a plant with its parts labelled A, B, C, and D. (6 marks)
[A] - Colourful part at top
|
[B] - Green flat parts
|
[C] - Long upright part
|
[D] - Underground branching parts
(a) Name each labelled part. (2 marks)
A: _____________ B: _____________
C: _____________ D: _____________
(b) Which part (A, B, C, or D) would you NOT find on a fern? Why? (2 marks)
(c) A farmer wants to grow more plants. Which part should he plant in the soil? Why? (2 marks)
30. Aisha observed a pond for a school project. She recorded the animals she found. (5 marks)
| Animal | Where found | Stage of life cycle |
|---|---|---|
| Mosquito larva | In the water | Larva |
| Dragonfly nymph | In the water | Nymph |
| Adult frog | On a lily pad | Adult |
| Tadpole | In the water | Tadpole |
(a) Which TWO animals undergo complete metamorphosis? (1 mark)
(b) Why are mosquito larvae found in water? (2 marks)
(c) Compare the dragonfly and mosquito life cycles. How are they different? (2 marks)
31. Kumar tested different materials to see which ones conduct electricity. He used a battery, bulb, and wires. (5 marks)
| Material | Did the bulb light up? |
|---|---|
| Copper wire | Yes |
| Wooden stick | No |
| Iron nail | Yes |
| Plastic straw | No |
| Aluminium foil | Yes |
(a) Which materials are electrical conductors? (1 mark)
(b) Why did the bulb not light up when Kumar used the wooden stick? (1 mark)
(c) Based on the results, would rubber be an electrical conductor? Explain your reasoning. (2 marks)
(d) Give ONE example of where an electrical conductor and a non-conductor are used together. (1 mark)
32. Mrs Lee's class grew plants in different coloured pots to see if it affects plant growth. (6 marks)
| Pot Colour | Plant Height after 2 weeks |
|---|---|
| Black | 15 cm |
| White | 12 cm |
| Clear (transparent) | 8 cm |
| Red | 13 cm |
All pots received the same amount of water, sunlight, and soil.
(a) Which plant grew the tallest? Which grew the shortest? (2 marks)
Tallest: _________________ Shortest: _________________
(b) Suggest ONE reason why the plant in the clear pot was the shortest. (2 marks)
(c) What was kept the same in this experiment? Why is this important? (2 marks)
33. Read the description of three organisms and answer the questions. (7 marks)
Organism A: Has roots, stem, leaves and flowers. Cannot move from place to place. Green in colour.
Organism B: Has wings, antennae, and six legs. Can fly. Goes through four stages in its life cycle.
Organism C: Grows on dead wood. Has no leaves, roots, or flowers. Not green in colour.
(a) Identify what each organism might be. (3 marks)
Organism A: ________________________________
Organism B: ________________________________
Organism C: ________________________________
(b) How does Organism A get its food? (1 mark)
(c) How does Organism C get its food? (1 mark)
(d) Give ONE similarity and ONE difference between Organism A and Organism C. (2 marks)
Similarity: _________________________________________________________________
Difference: _________________________________________________________________
Section C: Word Problems (30 marks)
Answer all questions in the spaces provided. Show your working where necessary.
34. The students of Ai Tong School set up a butterfly garden. They recorded their observations over 8 weeks. (8 marks)
Observation Journal:
- Week 1: Found tiny eggs on the leaves of citrus plants
- Week 2: Small caterpillars hatched and started eating leaves
- Week 4: Caterpillars grew much larger after shedding skin several times
- Week 5: Caterpillars attached themselves to branches and formed chrysalises
- Week 7: Beautiful swallowtail butterflies emerged from chrysalises
- Week 8: Butterflies were seen laying eggs on citrus plants
(a) Name the FOUR stages of the butterfly's life cycle in order. (2 marks)
(b) Why did the caterpillars eat so much during weeks 2-4? (2 marks)
(c) Why did the caterpillars shed their skin several times? (1 mark)
(d) What type of metamorphosis does the butterfly undergo? Give ONE reason. (2 marks)
(e) Why do butterflies lay eggs on citrus plants? (1 mark)
35. The Science department at Nanyang Primary School tested different materials for a bridge-building competition. Students had to build bridges that could hold the most weight. (8 marks)
| Material | Weight held before breaking |
|---|---|
| Paper straws | 50 g |
| Wooden sticks | 200 g |
| Plastic straws | 100 g |
| Metal wire | 500 g |
(a) Which material is the strongest? Which is the weakest? (2 marks)
Strongest: _______________________ Weakest: _______________________
(b) Despite being the strongest, metal wire may not be the best choice for a student bridge-building project. Give TWO reasons why. (2 marks)
Reason 1: __________________________________________________________________
Reason 2: __________________________________________________________________
(c) Engineers consider many properties when choosing materials for real bridges. Besides strength, name TWO other properties they might consider. (2 marks)
Property 1: ________________________________________________________________
Property 2: ________________________________________________________________
(d) The school wants to replace some wooden benches. Suggest a material that would last longer and explain why. (2 marks)
36. Mr Wong teaches at Punggol Primary School. He set up an experiment to help students understand plant needs. (8 marks)
Experiment Setup:
- 4 identical bean plants in identical pots
- Plant A: Normal watering, placed by window
- Plant B: Normal watering, placed in dark cupboard
- Plant C: No water, placed by window
- Plant D: Normal watering, roots wrapped in plastic to block air
Results after 2 weeks:
| Plant | Height | Leaf colour | Health |
|---|---|---|---|
| A | 20 cm | Green | Healthy |
| B | 25 cm | Yellow | Weak |
| C | 10 cm | Brown, crispy | Dead |
| D | 12 cm | Pale green | Unhealthy |
(a) Which plant was the control in this experiment? Why? (2 marks)
(b) Why did Plant B grow taller than Plant A even though it was in the dark? (2 marks)
(c) What does the result of Plant D tell us about what plants need? (2 marks)
(d) A student said "Plants only need water and sunlight to survive." Based on this experiment, is this statement correct? Explain. (2 marks)
37. Mei Mei visited Jurong Bird Park with her family. She learned about how birds and insects are different. (6 marks)
Information Board at Bird Park:
| Feature | Birds | Insects |
|---|---|---|
| Body covering | Feathers | Hard outer shell |
| Number of legs | 2 | 6 |
| Wings | 2 (covered with feathers) | Usually 2 or 4 (thin and delicate) |
| Life cycle | Egg → Chick → Adult (3 stages) | Varies (3 or 4 stages) |
(a) Both birds and butterflies have wings and can fly. Give TWO differences between bird wings and butterfly wings. (2 marks)
Difference 1: ________________________________________________________________
Difference 2: ________________________________________________________________
(b) A chicken and a butterfly both lay eggs. Compare their life cycles by giving ONE similarity and ONE difference. (2 marks)
Similarity: _________________________________________________________________
Difference: _________________________________________________________________
(c) The chick looks like a smaller version of an adult chicken. Why is this different from how a caterpillar becomes a butterfly? (2 marks)
End of Paper
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Answers
Primary 3 Science SA1 Examination 2026
TuitionGoWhere Practice Paper - Version 4 ANSWER KEY
Duration: 75 minutes
Total Marks: 100
Section A: Multiple Choice Questions (25 marks)
| Question | Answer | Topic |
|---|---|---|
| 1 | B | Diversity of Living and Non-living Things |
| 2 | B | Life Cycles |
| 3 | C | Diversity of Materials |
| 4 | B | Plant Systems |
| 5 | C | Diversity of Materials |
| 6 | C | Diversity of Living and Non-living Things |
| 7 | C | Life Cycles |
| 8 | D | Plant Systems |
| 9 | B | Diversity of Materials |
| 10 | B | Life Cycles |
| 11 | B | Diversity of Living and Non-living Things |
| 12 | A | Life Cycles |
| 13 | B | Plant Systems |
| 14 | B | Diversity of Materials |
| 15 | C | Life Cycles |
| 16 | B | Plant Systems |
| 17 | C | Diversity of Materials |
| 18 | B | Life Cycles |
| 19 | B | Plant Systems |
| 20 | B | Diversity of Materials |
| 21 | D | Life Cycles |
| 22 | B | Plant Systems |
| 23 | B | Diversity of Materials |
| 24 | B | Life Cycles |
| 25 | B | Plant Systems |
Section B: Short Answer Questions (45 marks)
26. (4 marks)
(a) Which can make own food and how (2 marks):
- Rose plant can make its own food. (1 mark)
- It uses sunlight, water and air (carbon dioxide) to make food in its leaves through photosynthesis. (1 mark)
(b) One difference between mushroom and rose plant (1 mark):
- Rose plant can make its own food, but mushroom cannot. / Rose plant has leaves and roots, but mushroom does not. / Rose plant is green, but mushroom is not.
(c) What all four living things have in common (1 mark):
- They all need water/air/food to survive. / They can all grow and reproduce. / They are all living things.
27. (6 marks)
(a) Two materials that float (1 mark):
- Wood and Cork
(b) Material not to use and why (2 marks):
- Iron should not be used. (1 mark)
- Iron conducts heat, so the handle would become very hot and burn the chef's hand. (1 mark)
(c) Best material for submarine window and reason (2 marks):
- Glass would be best. (1 mark)
- Glass is transparent so people can see through it, and it does not conduct heat (helps with insulation). (1 mark)
(d) Why cork floats and iron sinks (1 mark):
- Cork is less dense than water so it floats, while iron is denser than water so it sinks. / Cork is lighter than water for the same volume.
28. (6 marks)
(a) What insect is this (1 mark):
- Butterfly (or Moth)
(b) Names of each stage (2 marks):
- Stage 1: Egg (0.5 mark)
- Stage 2: Larva / Caterpillar (0.5 mark)
- Stage 3: Pupa / Chrysalis (0.5 mark)
- Stage 4: Adult butterfly (0.5 mark)
(c) Stage where body structure changes completely (1 mark):
- Stage 3 / Pupa stage
(d) Why insect eats a lot during Stage 2 (2 marks):
- The larva needs to store energy for the pupa stage when it cannot eat. (1 mark)
- It needs nutrients to grow and develop into an adult butterfly. (1 mark)
29. (6 marks)
(a) Names of labelled parts (2 marks):
- A: Flower (0.5 mark)
- B: Leaves (0.5 mark)
- C: Stem (0.5 mark)
- D: Roots (0.5 mark)
(b) Part not found on a fern and why (2 marks):
- Part A / Flower (1 mark)
- Ferns do not produce flowers; they reproduce using spores instead of seeds. (1 mark)
(c) Part to plant in soil and why (2 marks):
- Seeds (from Part A / Flower / Fruit) should be planted. (1 mark)
- Seeds contain the embryo that will grow into a new plant when given water and warmth. (1 mark)
- Accept: Roots/stem cuttings for vegetative propagation
30. (5 marks)
(a) Two animals that undergo complete metamorphosis (1 mark):
- Mosquito and Frog
(b) Why mosquito larvae found in water (2 marks):
- Mosquito eggs are laid in water and larvae live in water. (1 mark)
- Mosquito larvae breathe through special tubes and need water to survive until they become adults. (1 mark)
(c) Difference between dragonfly and mosquito life cycles (2 marks):
- Dragonfly undergoes incomplete metamorphosis (3 stages: egg → nymph → adult). (1 mark)
- Mosquito undergoes complete metamorphosis (4 stages: egg → larva → pupa → adult). (1 mark)
31. (5 marks)
(a) Electrical conductors (1 mark):
- Copper wire, Iron nail, Aluminium foil
(b) Why bulb didn't light up with wooden stick (1 mark):
- Wood is an electrical insulator/non-conductor, so electricity cannot flow through it.
(c) Would rubber be an electrical conductor (2 marks):
- No, rubber would not be an electrical conductor. (1 mark)
- Rubber is similar to plastic and wood, which are non-conductors. / Rubber is used to insulate electrical wires, which shows it does not conduct electricity. (1 mark)
(d) Example of conductor and non-conductor used together (1 mark):
- Electrical wires have a metal (conductor) core covered by rubber or plastic (non-conductor) coating. / Power plug has metal pins (conductor) and plastic body (non-conductor).
32. (6 marks)
(a) Tallest and shortest plants (2 marks):
- Tallest: Black pot (1 mark)
- Shortest: Clear (transparent) pot (1 mark)
(b) Why plant in clear pot was shortest (2 marks):
- Light could reach the roots through the clear pot. (1 mark)
- Roots normally grow in darkness, and light may have damaged them or caused algae growth in the soil. (1 mark)
(c) What was kept the same and why important (2 marks):
- Water, sunlight, and soil were kept the same. (1 mark)
- This is important to ensure a fair test so we know any differences are caused by the pot colour only. (1 mark)
33. (7 marks)
(a) Identification of organisms (3 marks):
- Organism A: Flowering plant (e.g., rose, hibiscus, any flowering plant) (1 mark)
- Organism B: Butterfly / Beetle / Any insect with complete metamorphosis (1 mark)
- Organism C: Mushroom / Fungus (1 mark)
(b) How Organism A gets food (1 mark):
- It makes its own food using sunlight, water, and air (carbon dioxide) in its leaves.
(c) How Organism C gets food (1 mark):
- It absorbs nutrients from dead or decaying matter / It breaks down dead wood to get food.
(d) Similarity and difference between A and C (2 marks):
- Similarity: Both cannot move from place to place / Both are living things / Both can reproduce. (1 mark)
- Difference: Organism A can make its own food (has leaves), but Organism C cannot / A is green but C is not / A has roots but C does not. (1 mark)
Section C: Word Problems (30 marks)
34. (8 marks)
(a) Four stages in order (2 marks):
- Egg → Caterpillar (Larva) → Pupa (Chrysalis) → Adult butterfly (0.5 mark each)
(b) Why caterpillars ate so much (2 marks):
- They needed to store energy for the pupa stage when they cannot eat. (1 mark)
- They needed nutrients to grow larger and develop into adult butterflies. (1 mark)
(c) Why caterpillars shed skin several times (1 mark):
- Their skin cannot stretch, so they shed it to allow their body to grow larger. / This is called moulting.
(d) Type of metamorphosis and reason (2 marks):
- Complete metamorphosis (1 mark)
- Because it has 4 stages with a pupa stage where the caterpillar completely transforms. / The young (caterpillar) looks completely different from the adult (butterfly). (1 mark)
(e) Why butterflies lay eggs on citrus plants (1 mark):
- So that when caterpillars hatch, they have food (citrus leaves) to eat immediately.
35. (8 marks)
(a) Strongest and weakest materials (2 marks):
- Strongest: Metal wire (1 mark)
- Weakest: Paper straws (1 mark)
(b) Two reasons metal wire may not be best choice (2 marks):
- Reason 1: Metal wire is harder to cut and shape for students. (1 mark)
- Reason 2: Metal wire is more expensive than other materials. / Metal wire might be too heavy. (1 mark)
(c) Two other properties engineers consider (2 marks):
- Property 1: Cost / Price (1 mark)
- Property 2: Weight / Durability / Resistance to rusting / Flexibility / Weather resistance (1 mark)
(d) Material to replace wooden benches and reason (2 marks):
- Metal / Concrete / Stone / Plastic (1 mark)
- Metal/concrete/stone does not rot when wet and is more durable. / Plastic is waterproof and does not absorb water like wood. (1 mark)
36. (8 marks)
(a) Control plant and why (2 marks):
- Plant A was the control. (1 mark)
- It had all the normal conditions (water, sunlight, air) that plants need to grow, so it can be compared with the other plants. (1 mark)
(b) Why Plant B grew taller despite being in the dark (2 marks):
- Plant B grew taller trying to reach light (etiolation). (1 mark)
- The plant stretched upward searching for sunlight, but it was weak and yellow because it couldn't make food properly. (1 mark)
(c) What Plant D's result tells us (2 marks):
- Plant D had its roots wrapped, blocking air from the roots. (1 mark)
- This shows that plant roots need air to absorb water and stay healthy. / Plants need air/oxygen at their roots. (1 mark)
(d) Is the statement correct and explanation (2 marks):
- No, the statement is not correct. (1 mark)
- Plant D shows that plants also need air at their roots to survive and grow healthily. (1 mark)
37. (6 marks)
(a) Two differences between bird wings and butterfly wings (2 marks):
- Difference 1: Bird wings are covered with feathers, but butterfly wings are thin and covered with tiny scales. (1 mark)
- Difference 2: Birds have 2 wings, but butterflies usually have 4 wings. / Bird wings are larger and stronger. (1 mark)
(b) Similarity and difference between chicken and butterfly life cycles (2 marks):
- Similarity: Both lay eggs / Both start life as eggs. (1 mark)
- Difference: Chicken has 3 stages with no pupa, while butterfly has 4 stages with a pupa stage. / Chick looks like the adult, but caterpillar looks different from butterfly. (1 mark)
(c) Why chick development is different from caterpillar (2 marks):
- The chick grows gradually larger while keeping the same body form (no metamorphosis). (1 mark)
- The caterpillar completely changes its body structure during the pupa stage to become a butterfly (complete metamorphosis). (1 mark)
Marking Summary
| Section | Maximum Marks |
|---|---|
| Section A: MCQ | 25 |
| Section B: Short Answer | 45 |
| Section C: Word Problems | 30 |
| Total | 100 |
End of Answer Key