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Primary 3 Science Weighted Assessment 1 (Term 1) Paper 4
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TUITIONGOWHERE PRIMARY SCHOOL (AI)
WEIGHTED ASSESSMENT 1 EXAMINATION 2026
PRIMARY 3 SCIENCE (VERSION 4) - ANSWER KEY
Duration: 45 minutes
Total Marks: 50
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
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)
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)
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)
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)
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)
Section B Total: /18
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)
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)
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
Section C Total: /12
Marking Summary
| Section | Maximum Marks | Marks Obtained |
|---|---|---|
| A (MCQ) | 20 | |
| B (Short Answer) | 18 | |
| C (Application) | 12 | |
| Total | 50 |
~ End of Answer Key ~