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Primary 3 Science Weighted Assessment 2 (Term 3) Paper 4

Free P3 Science WA2 Paper 4, 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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Questions

TuitionGoWhere Primary 3 Science WA2 2026 (Version 4)

Name: ______________________ Class: ______ Date: ____________

Duration: 45 minutes
Total Marks: 50

Section A: Multiple Choice Questions (15 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 is a living thing?

(A) Bicycle
(B) Stone
(C) Grass
(D) Plastic bottle

( )

2. What happens when a caterpillar forms a chrysalis?

(A) It becomes an egg
(B) It enters the pupa stage
(C) It becomes a larva
(D) It dies

( )

3. Which animal lays eggs?

(A) Dog
(B) Cat
(C) Whale
(D) Turtle

( )

4. The tongue helps us to detect:

(A) Sounds
(B) Smells
(C) Tastes
(D) Textures

( )

5. Zhi Wei is at the Singapore Zoo. He sees a tiger eating meat. Which group does the tiger belong to?

(A) Reptile
(B) Bird
(C) Mammal
(D) Amphibian

( )

6. Which of the following is NOT a function of the roots?

(A) Absorb water from soil
(B) Absorb minerals from soil
(C) Hold the plant firmly in the ground
(D) Make food for the plant

( )

7. How does an adult frog breathe?

(A) Using gills
(B) Using lungs
(C) Using its skin only
(D) Using fins

( )

8. Which organ is protected by the skull?

(A) Heart
(B) Lungs
(C) Brain
(D) Stomach

( )

9. Which of the following animals has feathers?

(A) Crocodile
(B) Penguin
(C) Shark
(D) Frog

( )

10. Sarah picked up an ice cube. Which sense did she use to know that it was cold?

(A) Sight
(B) Smell
(C) Touch
(D) Taste

( )

11. What is the function of the lungs?

(A) To digest food
(B) To pump blood
(C) To exchange oxygen and carbon dioxide
(D) To control body movements

( )

12. Which stage in the life cycle of a butterfly can eat and grow?

(A) Egg
(B) Larva
(C) Pupa
(D) Adult

( )

13. A healthy breakfast should include:

(A) Only chocolates and sweets
(B) Fruits, vegetables, and whole grains
(C) Only soft drinks
(D) Only chips and cookies

( )

14. Which animal breathes through gills?

(A) Dolphin
(B) Whale
(C) Goldfish
(D) Seal

( )

15. The body covering of reptiles is usually:

(A) Feathers
(B) Fur
(C) Dry scales
(D) Moist skin

( )

Section B: Short Answer Questions (20 marks)

Answer all questions in the spaces provided.

16. Study the diagram of a plant below.

    [Flower] - Part W
        |
    [Leaf] - Part X
        |
    [Stem] - Part Y
        |
    [Roots] - Part Z

(a) Which part (W, X, Y, or Z) makes food for the plant? (1 mark)

(b) How do water and minerals travel from Part Z to Part X? (1 mark)

17. Look at the life cycle of a cockroach below.

[Egg] → [Nymph] → [Adult Cockroach]

(a) How many stages are there in the cockroach's life cycle? (1 mark)

(b) Does the cockroach go through complete or incomplete metamorphosis? (1 mark)

18. Complete the table about sense organs and their functions. (3 marks)

Sense Organ	Sense	What It Helps Us Detect
Eyes	Sight	_________________________
_________	Hearing	Sounds
Nose	_________	Smells

19. Muthu visits the doctor because he has a fever.

(a) The doctor uses a thermometer to measure Muthu's body temperature. What is normal body temperature for a healthy person? (1 mark)

(b) Name ONE thing Muthu should do to get well soon. (1 mark)

20. The table below shows four animals and their characteristics.

Animal	Legs	Body Covering	How Young are Born
Sparrow	2	Feathers	From eggs
Cow	4	Fur	Live birth
Turtle	4	Scales	From eggs
Ant	6	Hard covering	From eggs

(a) Which animal is a mammal? Give ONE reason. (2 marks)

(b) Which animal is a bird? Give ONE reason. (2 marks)

21. Look at the diagram of the human body.

        [Head]
          |
    [Arms]--[Chest]--[Arms]
          |
      [Abdomen]
          |
        [Legs]

(a) Name ONE organ found in the chest. (1 mark)

(b) What is the function of the legs? (1 mark)

Section C: Word Problems (15 marks)

Answer all questions in the spaces provided.

22. Mei Ling's mother asked her to water the plants in their HDB flat balcony.

(a) Why do plants need water? Give TWO reasons. (2 marks)

(b) Mei Ling noticed that the leaves of the plant are facing the window. Why do you think this happens? (1 mark)

23. Uncle Ahmad keeps chickens at his farm.

(a) Describe the life cycle of a chicken. (2 marks)

(b) How is the life cycle of a chicken different from the life cycle of a butterfly? (2 marks)

24. Ravi's family is planning to stay healthy this year.

(a) Name THREE healthy habits that Ravi's family should practise. (3 marks)

(b) Why is drinking enough water important for our body? (1 mark)

25. Study the picture of a frog's life cycle.

[Eggs] → [Tadpole] → [Tadpole with legs] → [Froglet] → [Adult Frog]
          (Lives in water)                    (Can live on land)

(a) Where does a frog lay its eggs? Why? (2 marks)

(b) How does a tadpole change as it becomes a frog? State TWO changes. (2 marks)

End of Paper

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Answers

TuitionGoWhere Primary 3 Science WA2 2026 (Version 4) - Answer Key

Total Marks: 50

Section A: Multiple Choice Questions (15 marks)

Question	Answer	Explanation
1	C	Grass is a living thing (plant). Bicycles, stones, and plastic bottles are non-living.
2	B	When a caterpillar forms a chrysalis, it enters the pupa stage.
3	D	Turtles lay eggs. Dogs, cats, and whales are mammals that give birth to live young.
4	C	The tongue is the sense organ for taste.
5	C	Tigers are mammals (have fur, give birth to live young, feed young with milk).
6	D	Roots do not make food. Leaves make food through photosynthesis.
7	B	Adult frogs breathe using lungs. Tadpoles breathe using gills.
8	C	The brain is protected by the skull.
9	B	Penguins are birds and have feathers.
10	C	Touch sense (skin) is used to detect temperature (cold).
11	C	Lungs are for gas exchange - taking in oxygen and releasing carbon dioxide.
12	B	The larva (caterpillar) stage eats and grows. Pupa does not eat.
13	B	A healthy breakfast includes fruits, vegetables, and whole grains.
14	C	Goldfish breathe through gills. Dolphins, whales, and seals are mammals with lungs.
15	C	Reptiles have dry scales covering their body.

Section B: Short Answer Questions (20 marks)

16. (a) Part X (Leaf) makes food for the plant. (1 mark)

(b) Water and minerals travel from Part Z to Part X through Part Y / through the stem. (1 mark)

17. (a) There are 3 stages in the cockroach's life cycle. (1 mark)

(b) The cockroach goes through incomplete metamorphosis. (1 mark)

The nymph is smaller than the adult
The nymph does not have fully developed wings
The nymph cannot reproduce (1 mark)

18. (3 marks - 1 mark each)

Sense Organ	Sense	What It Helps Us Detect
Eyes	Sight	Light / Colours / Objects / Images
Ears	Hearing	Sounds
Nose	Smell	Smells

19. (a) Normal body temperature is about 37°C / 37 degrees Celsius. (1 mark)

(b) Accept any ONE:

Rest / sleep more
Drink plenty of water / fluids
Take medicine as prescribed
Eat nutritious food
See a doctor (1 mark)

To prevent spreading germs to others
To prevent the illness from getting worse
To remove germs from his hands (1 mark)

20. (a) Cow is a mammal. (1 mark) Accept any ONE reason:

It has fur
It gives birth to live young
It feeds its young with milk (1 mark)

(b) Sparrow is a bird. (1 mark) Accept any ONE reason:

It has feathers
It has 2 legs
It has a beak
It lays eggs (though this alone is not sufficient - must be combined with other features) (1 mark)

21. (a) Accept any ONE: Heart / Lungs (1 mark)

(b) The legs help us to walk / run / move / stand / kick. (1 mark)

Section C: Word Problems (15 marks)

22. (a) Accept any TWO: (2 marks - 1 mark each)

Water helps the plant make food
Water helps transport minerals from the soil to other parts of the plant
Water keeps the plant upright and healthy
Water helps the plant carry out photosynthesis

(b) The leaves are facing the window to get more sunlight. / Plants grow towards the light. (1 mark)

The plant will not be able to make enough food
The plant may wilt and die
The leaves may turn yellow
The plant will not grow well (1 mark)

23. (a) The life cycle of a chicken is: (2 marks) Egg → Chick → Adult Chicken (or described in sentences) The chicken hatches from an egg as a chick. The chick grows into an adult chicken.

(b) Accept any of these differences: (2 marks - 1 mark each)

Chicken has 3 stages; butterfly has 4 stages
Chicken does not go through metamorphosis; butterfly goes through complete metamorphosis
The young chicken (chick) looks similar to the adult; the young butterfly (caterpillar) looks very different from the adult
Chicken does not have a pupa stage; butterfly has a pupa stage

24. (a) Accept any THREE: (3 marks - 1 mark each)

Exercise regularly
Eat a balanced diet / healthy food
Get enough sleep (9-12 hours for children)
Drink 6-8 glasses of water daily
Wash hands before eating
Brush teeth twice a day
Take a bath daily
Avoid junk food

(b) Accept any ONE:

Water helps our body function properly
Water helps transport nutrients in our body
Water helps remove waste from our body
Water keeps us hydrated
Water helps regulate body temperature (1 mark)

25. (a) A frog lays its eggs in water. (1 mark) Accept any ONE reason:

The eggs need to stay moist / will dry out on land
Tadpoles live in water
Tadpoles breathe using gills and need water (1 mark)

(b) Accept any TWO changes: (2 marks - 1 mark each)

Legs grow
Tail disappears / gets shorter
Gills disappear and lungs develop
Body shape changes
Can live on land instead of only in water
Starts eating insects instead of plants

End of Answer Key

Marking Scheme Summary

Section	Questions	Marks
A	MCQ (1-15)	15
B	Short Answer (16-21)	20
C	Word Problems (22-25)	15
Total		50