Primary 3 Science Weighted Assessment 1 (Term 1) Paper 4

TUITIONGOWHERE PRIMARY SCHOOL (AI)

WEIGHTED ASSESSMENT 1 EXAMINATION 2026

PRIMARY 3 SCIENCE (VERSION 4)

Duration: 45 minutes
Total Marks: 50

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INSTRUCTIONS TO STUDENTS

1. Do not turn over this page until you are told to do so.
2. Answer all questions.
3. Write your answers clearly in the spaces provided.

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Name: _________________________ ( )
Class: Primary 3 ( )
Date: _________________________

Section	Marks
A (MCQ)	/20
B (Short Answer)	/18
C (Application)	/12
Total	/50

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Section A: Multiple Choice Questions (20 marks)

Choose the best answer and write 1, 2, 3 or 4 in the brackets. Each question carries 2 marks.

1. Which of these can grow, reproduce and respond to changes? (2 marks)

1. Cloud
2. Mushroom
3. Fire
4. River

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2. Plants are living things. How do we know this? (2 marks)

1. They are green
2. They are found outdoors
3. They grow and need water
4. They cannot move from place to place

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3. Which animal lays eggs and has feathers? (2 marks)

1. Bat
2. Platypus
3. Ostrich
4. Dolphin

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4. A tadpole breathes using gills. When it becomes a frog, it breathes using: (2 marks)

1. Gills
2. Lungs
3. Skin only
4. Fins

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5. Frosted glass in bathrooms is used because it is: (2 marks)

1. Transparent - lets you see through clearly
2. Opaque - blocks all light
3. Translucent - lets light through but not clear images
4. Reflective - bounces light back

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6. A spring can be pressed down and returns to shape. This shows the property of: (2 marks)

1. Hardness
2. Flexibility
3. Elasticity
4. Brittleness

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7. Which pair contains ONLY natural materials? (2 marks)

1. Silk and nylon
2. Cotton and wool
3. Rubber and plastic
4. Wood and glass

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8. Why do we use rubber to make erasers? (2 marks)

1. Rubber is transparent
2. Rubber is hard
3. Rubber is flexible and can rub off pencil marks
4. Rubber is absorbent

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9. The life cycle of a chicken is: Egg → Chick → Young chicken → Adult chicken. This shows: (2 marks)

1. Complete metamorphosis
2. Incomplete metamorphosis
3. No metamorphosis
4. Partial metamorphosis

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10. Which animal has a life cycle with a PUPA stage? (2 marks)

1. Frog
2. Cockroach
3. Ladybird
4. Chicken

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Section B: Short Answer Questions (18 marks)

Answer the questions clearly.

11. Look at this list: [Car, Bacteria, Sunflower, Robot, Mushroom, Cloud] (4 marks)

Sort them into living and non-living things.

Living things: _____________________________________________

Non-living things: _____________________________________________

Give ONE reason why bacteria is a living thing even though we cannot see it:

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12. Match each animal to its correct body covering: (4 marks)

Animals: Penguin, Goldfish, Elephant, Iguana

Animal	Body Covering
_____________	Feathers
_____________	Wet scales
_____________	Fur/Hair
_____________	Dry scales

13. Read the descriptions and identify the property: (3 marks)

a) Water cannot pass through this raincoat material. Property: _____________

b) This mirror shows my reflection clearly. Property: _____________

c) This clay can be shaped into different forms. Property: _____________

14. For each item, state if the material is natural or man-made, and name the source: (4 marks)

Item	Natural or Man-made?	Source
Silk scarf	_____________	_____________
Paper	_____________	_____________

15. Fill in the missing stages of the dragonfly life cycle: (3 marks)

_____________ → Nymph → _____________

This is called _____________ metamorphosis because there are only ___ stages.

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Section C: Application Questions (12 marks)

Use your knowledge to answer these questions.

16. Raj saw these in his garden pond: (4 marks)

[Tadpole, Fallen leaf, Water snail, Floating stick]

a) Which are living things? Give ONE characteristic they share. (2 marks)

Living things: _____________________________________________

Shared characteristic: _____________________________________________

b) The tadpole will change as it grows. Describe TWO changes that will happen. (2 marks)

Change 1: _____________________________________________

Change 2: _____________________________________________

17. Mrs. Wong needs to choose materials for a new bag. She wants it to be light, waterproof and strong. (4 marks)

Available materials: Leather, Canvas, Plastic, Cardboard

a) Which TWO materials would be BEST? Explain your choice for each. (2 marks)

Material 1: _____________________________________________

Reason: _____________________________________________

Material 2: _____________________________________________

Reason: _____________________________________________

b) Which material is NOT suitable? Why? (2 marks)

Material: _____________________________________________

Reason: _____________________________________________

18. Study this incomplete life cycle of a housefly: (4 marks)

A → Larva (Maggot) → B → Adult Fly

a) What is A? _____________

b) What is B? _____________

c) A maggot looks very different from an adult fly. What is this type of change called? (1 mark)

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d) Name ONE way the maggot is different from the adult fly. (1 mark)

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~ End of Paper ~

TUITIONGOWHERE PRIMARY SCHOOL (AI)

WEIGHTED ASSESSMENT 1 EXAMINATION 2026

PRIMARY 3 SCIENCE (VERSION 4) - ANSWER KEY

Duration: 45 minutes
Total Marks: 50

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Section A: Multiple Choice Questions (20 marks)

Each question carries 2 marks.

Question	Answer	Explanation
1	(2)	Mushroom is a living thing (fungus) that can grow, reproduce, and respond to changes. Clouds, fire, and rivers are non-living natural phenomena.
2	(3)	Plants grow and need water - these are characteristics of living things. Being green or found outdoors does not determine if something is living.
3	(3)	Ostrich is a bird - it lays eggs and has feathers. Bats are mammals (fur), platypus lays eggs but has fur (mammal), dolphins are mammals.
4	(2)	Adult frogs breathe using lungs. Tadpoles have gills but as they undergo metamorphosis, they develop lungs for breathing air.
5	(3)	Frosted glass is translucent - it lets light pass through but you cannot see clear images. This provides privacy while allowing light in.
6	(3)	Elasticity is the ability to be compressed/stretched and return to original shape. Flexibility is the ability to bend without breaking.
7	(2)	Cotton (from cotton plant) and wool (from sheep) are both natural materials. Nylon, plastic, and glass are man-made.
8	(3)	Rubber is flexible and has the right texture to rub off pencil marks without damaging paper. It's not hard, transparent, or absorbent.
9	(3)	Chickens show no metamorphosis - the chick looks like a smaller version of the adult and just grows bigger. No major body changes occur.
10	(3)	Ladybird (beetle) has complete metamorphosis with a pupa stage: Egg → Larva → Pupa → Adult. Frogs, cockroaches, and chickens don't have pupa stages.

Section A Total: /20

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Section B: Short Answer Questions (18 marks)

11. Look at this list: [Car, Bacteria, Sunflower, Robot, Mushroom, Cloud] (4 marks)

Living things: Bacteria, Sunflower, Mushroom (1.5 marks)

Non-living things: Car, Robot, Cloud (1.5 marks)

Give ONE reason why bacteria is a living thing even though we cannot see it:

Answer: Bacteria can grow, reproduce, need food/nutrients, and respond to their environment. (1 mark)

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12. Match each animal to its correct body covering: (4 marks)

Animal	Body Covering
Penguin	Feathers
Goldfish	Wet scales
Elephant	Fur/Hair
Iguana	Dry scales

(1 mark for each correct match)

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13. Read the descriptions and identify the property: (3 marks)

a) Water cannot pass through this raincoat material. Property: Waterproof (1 mark)

b) This mirror shows my reflection clearly. Property: Reflective (1 mark)

c) This clay can be shaped into different forms. Property: Flexible / Malleable (1 mark)

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14. For each item, state if the material is natural or man-made, and name the source: (4 marks)

Item	Natural or Man-made?	Source
Silk scarf	Natural	Silkworm / Silk moth cocoon
Paper	Natural	Trees / Wood pulp

(1 mark for each correct cell)

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15. Fill in the missing stages of the dragonfly life cycle: (3 marks)

Egg → Nymph → Adult dragonfly (1 mark)

This is called incomplete metamorphosis because there are only 3 stages. (2 marks)

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Section B Total: /18

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Section C: Application Questions (12 marks)

16. Raj saw these in his garden pond: (4 marks)

a) Which are living things? Give ONE characteristic they share. (2 marks)

Living things: Tadpole, Water snail (1 mark)

Shared characteristic: They need food/water/air, they can grow, they can reproduce, they respond to changes (1 mark)

Accept any valid characteristic of living things

b) The tadpole will change as it grows. Describe TWO changes that will happen. (2 marks)

Change 1: It will grow legs (back legs first, then front legs) (1 mark)

Change 2: Its tail will shrink/disappear OR It will develop lungs to breathe air OR Its gills will disappear (1 mark)

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17. Mrs. Wong needs to choose materials for a new bag. (4 marks)

a) Which TWO materials would be BEST? Explain your choice for each. (2 marks)

Material 1: Leather (0.5 mark)

Reason: Leather is strong and durable / waterproof / long-lasting (0.5 mark)

Material 2: Plastic (0.5 mark)

Reason: Plastic is light, waterproof, and can be made strong (0.5 mark)

Accept Canvas with explanation that it is strong and can be made waterproof

b) Which material is NOT suitable? Why? (2 marks)

Material: Cardboard (1 mark)

Reason: Cardboard absorbs water and becomes soggy/weak when wet. It is not waterproof and tears easily. (1 mark)

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18. Study this incomplete life cycle of a housefly: (4 marks)

A → Larva (Maggot) → B → Adult Fly

a) What is A? Egg (1 mark)

b) What is B? Pupa (1 mark)

c) A maggot looks very different from an adult fly. What is this type of change called? (1 mark)

Answer: Complete metamorphosis / Metamorphosis

d) Name ONE way the maggot is different from the adult fly. (1 mark)

Answer: Accept any ONE of:

• Maggot has no wings / Adult fly has wings
• Maggot has no legs / Adult fly has 6 legs
• Maggot cannot fly / Adult fly can fly
• Maggot has no eyes / Adult fly has compound eyes
• Maggot is worm-like / Adult fly has distinct body parts

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Section C Total: /12

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Marking Summary

Section	Maximum Marks	Marks Obtained
A (MCQ)	20
B (Short Answer)	18
C (Application)	12
Total	50

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~ End of Answer Key ~