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Primary 3 Science Semestral Assessment 1 (Mid-Year) Paper 5
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Questions
Primary 3 Science SA1 Examination 2026
TuitionGoWhere Practice Paper - Version 5
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 correctly classifies the items?
| Living | Non-living |
|---|---|
| (A) Tree, cloud | Rock, water |
| (B) Coral, seaweed | Sand, chair |
| (C) Mushroom, robot | Fish, glass |
| (D) Bird, plastic | Metal, water |
( )
2. What do plants need to make food?
(A) Soil, fertilizer and darkness
(B) Water, carbon dioxide and sunlight
(C) Rocks, sand and air
(D) Food, oxygen and shade
( )
3. Which material is both waterproof AND flexible?
(A) Glass
(B) Wood
(C) Rubber
(D) Paper
( )
4. Which of the following shows the correct life cycle of a cockroach?
(A) Egg → Larva → Pupa → Adult
(B) Egg → Nymph → Adult
(C) Egg → Tadpole → Adult
(D) Egg → Caterpillar → Adult
( )
5. The main function of leaves is to __________.
(A) absorb water from the soil
(B) make food for the plant
(C) hold the plant in the ground
(D) produce seeds
( )
6. Which of the following is an example of an once-living thing?
(A) Plastic bottle
(B) Iron nail
(C) Woollen sweater
(D) Glass window
( )
7. A mango tree, a grasshopper and a frog all __________.
(A) can move from place to place
(B) can make their own food
(C) need water to survive
(D) lay eggs
( )
8. Which of the following materials would be best for making a greenhouse?
(A) Cardboard
(B) Metal sheets
(C) Clear plastic or glass
(D) Wooden planks
( )
9. During which stage of its life cycle is a butterfly unable to move or eat?
(A) Egg
(B) Larva
(C) Pupa
(D) Adult
( )
10. Which plant part stores food in a potato plant?
(A) Leaf
(B) Flower
(C) Stem (underground)
(D) Root
( )
11. Cotton comes from __________ and wool comes from __________.
(A) animals; plants
(B) plants; animals
(C) factories; factories
(D) rocks; trees
( )
12. How is a tadpole different from an adult frog?
(A) A tadpole has four legs
(B) A tadpole breathes with lungs
(C) A tadpole has a tail and gills
(D) A tadpole lives on land
( )
13. Why do some flowers have bright colours and sweet smells?
(A) To scare away predators
(B) To attract insects for pollination
(C) To absorb more sunlight
(D) To store more water
( )
14. Which property of plastic makes it suitable for food containers?
(A) It is heavy
(B) It breaks easily
(C) It is waterproof and lightweight
(D) It conducts heat well
( )
15. A ladybird (ladybug) goes through __________ metamorphosis with __________ stages.
(A) complete; 4
(B) incomplete; 3
(C) complete; 3
(D) incomplete; 4
( )
16. What will happen if a plant's stem is cut?
(A) The plant will grow more leaves
(B) Water cannot reach the leaves
(C) The plant will produce more flowers
(D) The roots will grow faster
( )
17. Which statement about metals is TRUE?
(A) All metals float on water
(B) All metals are transparent
(C) Metals can conduct electricity
(D) Metals are always soft
( )
18. Which animal has young that looks MOST different from its adult form?
(A) Cat
(B) Chicken
(C) Butterfly
(D) Crocodile
( )
19. What does a seed need to germinate?
(A) Sunlight and fertilizer
(B) Water and warmth
(C) Soil and rocks
(D) Air and cold
( )
20. Bamboo is a natural material. Which of the following is NOT made from natural materials?
(A) Wooden chair
(B) Leather shoes
(C) Styrofoam box
(D) Cotton T-shirt
( )
21. Which is the correct order for a mosquito's life cycle?
(A) Egg → Pupa → Larva → Adult
(B) Egg → Adult → Larva → Pupa
(C) Egg → Larva → Pupa → Adult
(D) Larva → Egg → Pupa → Adult
( )
22. A cactus stores water in its __________.
(A) roots
(B) flowers
(C) stem
(D) seeds
( )
23. Why are electrical wires covered with plastic or rubber?
(A) To make them look colourful
(B) To prevent electricity from flowing
(C) To prevent electric shock
(D) To make them heavier
( )
24. Which pair of animals both undergo incomplete metamorphosis?
(A) Butterfly and moth
(B) Grasshopper and cockroach
(C) Frog and mosquito
(D) Beetle and dragonfly
( )
25. A seedling grows towards the light. This is because __________.
(A) the seedling needs light to make food
(B) the seedling is afraid of darkness
(C) the seedling wants to grow taller than other plants
(D) the seedling needs light to absorb water
( )
Section B: Short Answer Questions (45 marks)
Answer all questions in the spaces provided.
26. Study the information about four organisms. (4 marks)
| Organism | Has roots | Has leaves | Can move | Lays eggs |
|---|---|---|---|---|
| Fern | Yes | Yes | No | No |
| Butterfly | No | No | Yes | Yes |
| Moss | Yes | Yes | No | No |
| Earthworm | No | No | Yes | Yes |
(a) Which TWO organisms are plants? How do you know? (2 marks)
(b) Both butterfly and earthworm can move. Give ONE other characteristic they share. (1 mark)
(c) Fern and moss are both plants, but neither lays eggs. How do they reproduce? (1 mark)
27. Look at the materials used in a typical Singapore HDB flat. (6 marks)
| Item | Material | Property |
|---|---|---|
| Window | Glass | ? |
| Door handle | Metal | ? |
| Water pipe | PVC (plastic) | ? |
| Floor mat | Rubber | ? |
(a) Fill in ONE important property for each material. (2 marks)
Window (Glass): _________________________
Door handle (Metal): _________________________
Water pipe (PVC): _________________________
Floor mat (Rubber): _________________________
(b) Why is metal used for door handles instead of plastic? Give ONE reason. (2 marks)
(c) Suggest why rubber is a good material for floor mats. Give TWO reasons. (2 marks)
28. The diagram shows the stages of an insect's life cycle. (6 marks)
Stage A: Many tiny round objects on a leaf
↓
Stage B: Small creature with many legs eating leaves
↓
Stage C: Hard oval case attached to a twig
↓
Stage D: Winged insect flying from flower to flower
(a) What insect is this? What type of metamorphosis does it undergo? (2 marks)
Insect: _________________________
Type of metamorphosis: _________________________
(b) Name each stage (A, B, C, D). (2 marks)
Stage A: _____________ Stage B: _____________
Stage C: _____________ Stage D: _____________
(c) Compare this life cycle to a grasshopper's life cycle. Give TWO differences. (2 marks)
29. Ahmad grew bean plants for a science project. He set up four plants with different conditions. (6 marks)
| Plant | Condition | Result after 3 weeks |
|---|---|---|
| 1 | Placed by sunny window, watered regularly | Green, healthy, 25 cm tall |
| 2 | Placed by sunny window, NOT watered | Brown, dried up, dead |
| 3 | Placed in dark room, watered regularly | Yellow, thin, 35 cm tall |
| 4 | Placed by sunny window, watered, roots covered | Wilted, unhealthy |
(a) Which plant grew the healthiest? What two things did it receive? (2 marks)
(b) Plant 3 grew taller than Plant 1, but was it healthier? Explain. (2 marks)
(c) Plant 4 had sunlight and water but was still unhealthy. What did the covered roots prevent? (2 marks)
30. Siti made a chart comparing three animals' life cycles. (5 marks)
| Feature | Butterfly | Frog | Chicken |
|---|---|---|---|
| Number of stages | 4 | 4 | 3 |
| Has pupa stage | Yes | No | No |
| Young looks like adult | No | No | Yes |
| Lays eggs in water | No | Yes | No |
(a) Why does the frog lay eggs in water? (2 marks)
(b) Both butterfly and frog have young that look different from adults. What is this type of change called? (1 mark)
(c) Why does the chart say the chicken's young looks like the adult? (2 marks)
31. The school canteen uses different materials for various purposes. (5 marks)
| Item | Material | Purpose |
|---|---|---|
| Trays | Plastic | Carrying food |
| Utensils | Stainless steel | Eating |
| Napkins | Paper | Wiping |
| Table covers | Vinyl (plastic-coated cloth) | Protecting tables |
(a) Why is stainless steel used for utensils instead of regular iron? (2 marks)
(b) Paper napkins absorb liquids well. What property is this? (1 mark)
(c) Why are table covers made of vinyl instead of plain cloth? Give ONE reason. (2 marks)
32. Mrs Tan's class did an experiment on how light affects plant growth. They grew plants under different coloured light. (6 marks)
| Light colour | Plant height after 2 weeks | Leaf colour |
|---|---|---|
| White (normal) | 20 cm | Dark green |
| Blue | 18 cm | Green |
| Red | 22 cm | Light green |
| Green | 10 cm | Yellow-green |
(a) Which light colour resulted in the tallest plant? The shortest? (2 marks)
Tallest: _________________ Shortest: _________________
(b) The plant under green light grew the least. Suggest why. (2 marks)
(c) Based on the results, what can you conclude about what type of light is best for plant growth? (2 marks)
33. Read about three different habitats and the organisms that live there. (7 marks)
Habitat A - Garden: Rose bushes, butterflies, earthworms, mushrooms growing on dead logs
Habitat B - Pond: Water lilies, tadpoles, mosquito larvae, water snails
Habitat C - Seashore: Seaweed, crabs, barnacles attached to rocks, empty shells
(a) Name ONE living thing and ONE non-living thing from Habitat C. (2 marks)
Living: _________________________ Non-living: _________________________
(b) From Habitat A, name ONE organism that can make its own food and ONE that cannot. (2 marks)
Can make own food: _________________________
Cannot make own food: _________________________
(c) The tadpoles in Habitat B will change as they grow. Describe TWO changes they will go through. (2 marks)
Change 1: _________________________________________________________________
Change 2: _________________________________________________________________
(d) Why are the barnacles in Habitat C attached to rocks instead of swimming freely? (1 mark)
Section C: Word Problems (30 marks)
Answer all questions in the spaces provided. Show your working where necessary.
34. The Green Club at Raffles Girls' Primary School set up a "Butterfly Garden" project. They documented the entire life cycle of the Painted Jezebel butterfly. (8 marks)
Project Timeline:
- Day 1: Female butterfly laid small yellow eggs under leaves
- Day 5: Tiny caterpillars emerged and started eating
- Days 6-20: Caterpillars grew larger, moulting 5 times
- Day 21: Caterpillars stopped eating and formed pupae
- Day 30: Adult butterflies emerged and flew to flowers
(a) List the four stages of the butterfly's life cycle in order. (2 marks)
(b) Why did the caterpillars moult (shed their skin) 5 times? (2 marks)
(c) A student noticed that the adult butterflies visited flowers. Why do butterflies visit flowers? Give TWO reasons. (2 marks)
Reason 1: __________________________________________________________________
Reason 2: __________________________________________________________________
(d) The female butterfly laid eggs under leaves instead of on top. Suggest why. (2 marks)
35. The Science Department at Anglo-Chinese School (Primary) tested different materials for building a model house. They tested each material's properties. (8 marks)
| Material | Waterproof | Strong | Transparent | Cost |
|---|---|---|---|---|
| Cardboard | No | Low | No | Cheap |
| Plastic sheets | Yes | Medium | Yes | Medium |
| Wooden sticks | No | High | No | Cheap |
| Metal sheets | Yes | High | No | Expensive |
(a) Which material would be best for the roof of the model house? Explain your choice. (2 marks)
(b) Which material would be best for windows? Explain your choice. (2 marks)
(c) The students want walls that are strong but cheap. Which material should they use? What is ONE disadvantage of this choice? (2 marks)
Material: ___________________________________________________________________
Disadvantage: ______________________________________________________________
(d) Real houses are not made entirely of one material. Explain why builders use different materials for different parts of a house. (2 marks)
36. Mr Goh teaches Primary 3 students at Pei Hwa Presbyterian Primary School. He set up demonstrations about plant parts and their functions. (8 marks)
Demonstration 1: Red food colouring was added to water. A white flower was placed in the coloured water. After 24 hours, the flower petals turned red.
Demonstration 2: A leaf was covered with petroleum jelly on both sides. After a few days, the leaf turned brown.
Demonstration 3: A plant was placed with its roots in water but no soil. It continued to grow for several weeks.
(a) What does Demonstration 1 tell us about how water moves in a plant? (2 marks)
(b) In Demonstration 2, why did the covered leaf turn brown? (2 marks)
(c) What does Demonstration 3 tell us about whether plants need soil to grow? (2 marks)
(d) Based on all three demonstrations, explain what plants really need to survive. (2 marks)
37. Mei Ling's family visited the Singapore Zoo. She observed different animals and their young. (6 marks)
Her observations:
- The baby elephant stayed close to its mother and looked like a smaller elephant
- In the reptile house, she saw crocodile eggs in a nest
- At the butterfly enclosure, she saw eggs, caterpillars, and pupae at different stations
- The chicks in the farm area had fluffy feathers and followed the mother hen
(a) Compare the life cycles of the elephant and the butterfly. Give ONE similarity and ONE difference. (2 marks)
Similarity: _________________________________________________________________
Difference: _________________________________________________________________
(b) Both crocodiles and butterflies lay eggs. However, their life cycles are different. Explain ONE difference. (2 marks)
(c) Mei Ling wondered why some animals' young (like chicks) can walk soon after hatching, while others (like human babies) cannot. Suggest ONE reason why this might be. (2 marks)
End of Paper
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Answers
Primary 3 Science SA1 Examination 2026
TuitionGoWhere Practice Paper - Version 5 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 | Plant Systems |
| 3 | C | Diversity of Materials |
| 4 | B | Life Cycles |
| 5 | B | Plant Systems |
| 6 | C | Diversity of Living and Non-living Things |
| 7 | C | Diversity of Living and Non-living Things |
| 8 | C | Diversity of Materials |
| 9 | C | Life Cycles |
| 10 | C | Plant Systems |
| 11 | B | Diversity of Materials |
| 12 | C | Life Cycles |
| 13 | B | Plant Systems |
| 14 | C | Diversity of Materials |
| 15 | A | Life Cycles |
| 16 | B | Plant Systems |
| 17 | C | Diversity of Materials |
| 18 | C | Life Cycles |
| 19 | B | Plant Systems |
| 20 | C | Diversity of Materials |
| 21 | C | Life Cycles |
| 22 | C | Plant Systems |
| 23 | C | Diversity of Materials |
| 24 | B | Life Cycles |
| 25 | A | Plant Systems |
Section B: Short Answer Questions (45 marks)
26. (4 marks)
(a) Two organisms that are plants and how (2 marks):
- Fern and Moss are plants. (1 mark)
- They both have roots and leaves. / They cannot move from place to place. (1 mark)
(b) Other characteristic butterfly and earthworm share (1 mark):
- Both lay eggs. / Both need food, water and air to survive. / Both are living things.
(c) How fern and moss reproduce (1 mark):
- They reproduce using spores (not seeds or eggs).
27. (6 marks)
(a) Important property for each material (2 marks - 0.5 each):
- Window (Glass): Transparent / Allows light through
- Door handle (Metal): Strong / Durable / Hard
- Water pipe (PVC): Waterproof / Does not rust
- Floor mat (Rubber): Flexible / Non-slip / Soft
(b) Why metal instead of plastic for door handles (2 marks):
- Metal is stronger and more durable than plastic. (1 mark)
- Metal can withstand more force and does not break easily with regular use. (1 mark)
(c) Why rubber is good for floor mats (2 marks):
- Rubber is flexible and soft, making it comfortable to stand on. (1 mark)
- Rubber provides good grip and prevents slipping. / Rubber is waterproof and easy to clean. (1 mark)
28. (6 marks)
(a) Insect and type of metamorphosis (2 marks):
- Insect: Butterfly / Moth (1 mark)
- Type of metamorphosis: Complete metamorphosis (1 mark)
(b) Names of each stage (2 marks - 0.5 each):
- Stage A: Egg
- Stage B: Larva / Caterpillar
- Stage C: Pupa / Chrysalis
- Stage D: Adult butterfly
(c) Two differences from grasshopper's life cycle (2 marks):
- Butterfly has 4 stages while grasshopper has 3 stages. (1 mark)
- Butterfly has a pupa stage while grasshopper does not. / Butterfly caterpillar looks very different from adult, while grasshopper nymph looks like a small adult. (1 mark)
29. (6 marks)
(a) Healthiest plant and what it received (2 marks):
- Plant 1 grew the healthiest. (1 mark)
- It received sunlight and water. (1 mark)
(b) Was Plant 3 healthier and explanation (2 marks):
- No, Plant 3 was not healthier. (1 mark)
- It grew taller because it was reaching for light (etiolation), but it was yellow and thin because it could not make food without sunlight. (1 mark)
(c) What covered roots prevented (2 marks):
- The covered roots could not get air/oxygen. (1 mark)
- Plant roots need air to function properly and absorb water and nutrients. (1 mark)
30. (5 marks)
(a) Why frog lays eggs in water (2 marks):
- Frog eggs do not have hard shells and would dry out on land. (1 mark)
- Tadpoles that hatch from the eggs need water to survive and breathe with gills. (1 mark)
(b) What this type of change is called (1 mark):
- Metamorphosis
(c) Why chicken's young looks like adult (2 marks):
- The chick has the same body shape as the adult chicken. (1 mark)
- The chick just grows bigger without major changes to its form (no metamorphosis). (1 mark)
31. (5 marks)
(a) Why stainless steel instead of regular iron (2 marks):
- Stainless steel does not rust easily. (1 mark)
- Regular iron would rust when exposed to water and food, which is unhygienic. (1 mark)
(b) Property of absorbing liquids (1 mark):
- Absorbency
(c) Why vinyl instead of plain cloth (2 marks):
- Vinyl is waterproof / has a plastic coating. (1 mark)
- This makes it easy to wipe clean and prevents liquids from soaking through. (1 mark)
32. (6 marks)
(a) Tallest and shortest plants (2 marks):
- Tallest: Red light (1 mark)
- Shortest: Green light (1 mark)
(b) Why plant under green light grew least (2 marks):
- Plants appear green because they reflect green light instead of absorbing it. (1 mark)
- Since the plant cannot use green light well for making food, it grew poorly. (1 mark)
(c) Conclusion about best light for plant growth (2 marks):
- White light (which contains all colours) is best for healthy plant growth. (1 mark)
- Red and blue light are useful for plants, while green light is not used efficiently. (1 mark)
33. (7 marks)
(a) Living and non-living from Habitat C (2 marks):
- Living: Seaweed / Crabs / Barnacles (any one) (1 mark)
- Non-living: Empty shells / Rocks / Sand / Water (any one) (1 mark)
(b) Organism that can make food and one that cannot from Habitat A (2 marks):
- Can make own food: Rose bushes (1 mark)
- Cannot make own food: Butterflies / Earthworms / Mushrooms (any one) (1 mark)
(c) Two changes tadpoles will go through (2 marks):
- Change 1: They will grow legs. (1 mark)
- Change 2: Their tails will become shorter and disappear. / They will develop lungs to breathe air. (1 mark)
(d) Why barnacles are attached to rocks (1 mark):
- Barnacles cannot swim; they attach to rocks to stay in place and filter food from the water. / It is how they live and survive in their habitat.
Section C: Word Problems (30 marks)
34. (8 marks)
(a) Four stages in order (2 marks):
- Egg → Caterpillar (Larva) → Pupa → Adult butterfly (0.5 each)
(b) Why caterpillars moulted 5 times (2 marks):
- Caterpillars' skin cannot stretch as they grow. (1 mark)
- They need to shed their old skin to allow their body to grow larger. (1 mark)
(c) Two reasons butterflies visit flowers (2 marks):
- Reason 1: To drink nectar from flowers for food/energy. (1 mark)
- Reason 2: To help with pollination. / To lay eggs on plants. (1 mark)
(d) Why eggs laid under leaves (2 marks):
- Under the leaf provides protection from rain, sun and predators. (1 mark)
- It also hides the eggs from birds and other animals that might eat them. (1 mark)
35. (8 marks)
(a) Best material for roof and explanation (2 marks):
- Metal sheets or Plastic sheets (1 mark)
- They are waterproof, which is important for a roof to keep rain out. Metal is also strong. (1 mark)
(b) Best material for windows and explanation (2 marks):
- Plastic sheets (1 mark)
- Plastic is transparent so light can enter, and it is waterproof. / Glass would be ideal but plastic is the transparent option in the table. (1 mark)
(c) Material for strong but cheap walls and disadvantage (2 marks):
- Material: Wooden sticks (1 mark)
- Disadvantage: Wood is not waterproof, so it may rot if it gets wet. (1 mark)
(d) Why builders use different materials (2 marks):
- Different parts of a house have different needs. (1 mark)
- For example, roofs need to be waterproof, windows need to be transparent, and walls need to be strong. No single material has all properties. (1 mark)
36. (8 marks)
(a) What Demonstration 1 tells us (2 marks):
- Water travels up through the stem to all parts of the plant. (1 mark)
- The stem transports water from the roots to the leaves and flowers. (1 mark)
(b) Why covered leaf turned brown (2 marks):
- The petroleum jelly blocked the tiny holes (stomata) on the leaf. (1 mark)
- The leaf could not exchange gases (take in carbon dioxide, release oxygen) needed for making food and breathing, so it died. (1 mark)
(c) What Demonstration 3 tells us (2 marks):
- Plants do not need soil to grow. (1 mark)
- As long as they have water (and nutrients), they can survive. Soil is just one way to provide support and nutrients. (1 mark)
(d) What plants really need to survive (2 marks):
- Plants need water, air (carbon dioxide), sunlight, and nutrients. (1 mark)
- They also need a way to transport water (through the stem) and to exchange gases (through leaves). (1 mark)
37. (6 marks)
(a) Similarity and difference between elephant and butterfly life cycles (2 marks):
- Similarity: Both start life from their mothers / Both are living things that grow and develop. (1 mark)
- Difference: Baby elephant looks like a small adult (no metamorphosis), but butterfly goes through complete metamorphosis with 4 different-looking stages. (1 mark)
(b) One difference between crocodile and butterfly life cycles (2 marks):
- Baby crocodile looks like a small adult when it hatches (no metamorphosis). (1 mark)
- Butterfly goes through 4 stages (egg → caterpillar → pupa → adult) with complete metamorphosis where the young looks completely different from the adult. (1 mark)
(c) Why some young animals can walk immediately and others cannot (2 marks):
- Different animals have different survival needs. (1 mark)
- Chicks need to walk quickly to follow their mother and find food, while human babies are cared for by parents for a longer time and develop more slowly. / It depends on how the animal survives in its environment. (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