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Primary 6 PSLE Science Weighted Assessment 1 (Term 1) Paper 1

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TuitionGoWhere P6 Science - WA1 2026

School: TuitionGoWhere
Subject: Science
Level: Primary 6
Assessment: Weighted Assessment 1 (WA1)
Duration: 1 hour 45 minutes
Total Marks: 100 marks
Date: March 2026

INSTRUCTIONS TO CANDIDATES

Write your name and class in the spaces provided.
This paper consists of TWO sections.
Answer ALL questions.
Write your answers in the spaces provided in this booklet.
You may use a calculator for calculations.
All working must be shown clearly.

SECTION A: Multiple Choice Questions (56 marks)

For each question, choose the best answer and write the letter (A, B, C, or D) in the brackets provided.

1. Which process allows plants to make their own food? (2 marks)

A) Respiration
B) Photosynthesis
C) Digestion
D) Reproduction

Answer: [ ]

2. What is required for photosynthesis to take place? (2 marks)

A) Oxygen, water, and light
B) Carbon dioxide, water, and light
C) Nitrogen, water, and heat
D) Carbon dioxide, oxygen, and light

Answer: [ ]

3. A force is best described as: (2 marks)

A) Energy in motion
B) A push or a pull
C) The weight of an object
D) The speed of movement

Answer: [ ]

4. Which type of force causes objects to fall to the ground? (2 marks)

A) Magnetic force
B) Frictional force
C) Gravitational force
D) Elastic spring force

Answer: [ ]

5. What is weight? (2 marks)

A) The amount of space an object takes up
B) The amount of matter in an object
C) The gravitational force acting on an object
D) The temperature of an object

Answer: [ ]

6. A population consists of: (2 marks)

A) All different species in an area
B) Organisms of the same species living together
C) Only plants in a habitat
D) The physical environment

Answer: [ ]

7. Which organisms are producers in an ecosystem? (2 marks)

A) Animals that eat plants
B) Animals that eat other animals
C) Organisms that make their own food
D) Organisms that break down dead matter

Answer: [ ]

8. During photosynthesis, oxygen is: (2 marks)

A) Used up by the plant
B) Converted to carbon dioxide
C) Released as a waste product
D) Stored in the roots

Answer: [ ]

9. Friction is a force that: (2 marks)

A) Always helps motion
B) Always opposes motion
C) Only acts on liquids
D) Only acts in space

Answer: [ ]

10. When you stretch a rubber band, it stores: (2 marks)

A) Kinetic energy
B) Heat energy
C) Elastic potential energy
D) Chemical energy

Answer: [ ]

11. Which factor does NOT affect plant growth? (2 marks)

A) Light intensity
B) Water availability
C) Color of the pot
D) Carbon dioxide concentration

Answer: [ ]

12. In a food chain, energy flows from: (2 marks)

A) Consumers to producers
B) Decomposers to consumers
C) Producers to consumers
D) Predators to prey

Answer: [ ]

13. A community in ecology refers to: (2 marks)

A) A single organism
B) One species population
C) Many populations living together
D) The physical environment only

Answer: [ ]

14. Which statement about forces is correct? (2 marks)

A) Forces always cause movement
B) Forces can change motion, direction, or shape
C) Forces only act on large objects
D) Forces cannot be measured

Answer: [ ]

15-28. [Additional MCQ questions continuing the pattern...]

SECTION B: Open-Ended Questions (44 marks)

Question 1 (15 marks)

Sarah investigates whether plants need light for photosynthesis. She sets up an experiment with two identical plants.

Plant A: Placed in bright sunlight
Plant B: Placed in a dark cupboard

Both plants receive the same amount of water daily.

(a) State the factor being investigated in this experiment. (1 mark)

(b) Identify TWO factors that Sarah kept the same to make this a fair test. (2 marks)

(c) Predict the results Sarah would observe after one week. (4 marks)

Plant A: _________________________________________________

Reason: _________________________________________________

Plant B: _________________________________________________

Reason: _________________________________________________

(d) Sarah wants to test the leaves for starch. Describe the method she should use. (4 marks)

Step 1: _________________________________________________

Step 2: _________________________________________________

Step 3: _________________________________________________

Step 4: _________________________________________________

(e) Explain why testing for starch shows whether photosynthesis has occurred. (2 marks)

(f) Suggest one improvement Sarah could make to increase the reliability of her results. (2 marks)

Question 2 (14 marks)

The diagram shows organisms in a pond ecosystem:

[Diagram shows: Water plants → Small fish → Large fish → Bird
                       ↘ Water insects ↗
                Bacteria and algae at bottom]

(a) Identify the producers in this ecosystem. (2 marks)

(b) Name two consumers from the diagram. (2 marks)

(c) What role do bacteria play in this ecosystem? (2 marks)

(d) Construct a food chain from the organisms shown, starting with a producer. (3 marks)

_________________________________________________ → _________________ → _________________ → _________________

(e) Explain what would happen to the small fish population if all the large fish were removed from the pond. (3 marks)

(f) Describe two physical factors that could affect the survival of organisms in this pond. (2 marks)

Question 3 (15 marks)

The table shows data from an experiment investigating elastic spring force:

Weight Added (N)	Extension of Spring (cm)
1	2
2	4
3	6
4	8

(a) Describe the pattern shown in the results. (2 marks)

(b) Predict the extension if a 5 N weight was added. (2 marks)

Prediction: _________________ cm

Method: _________________________________________________

(c) What type of force tries to return the spring to its original length? (1 mark)

(d) Name the type of energy stored in the stretched spring. (1 mark)

(e) The experiment is repeated with a stiffer spring. Predict how the results would differ. (3 marks)

(f) Give two examples of how elastic spring force is used in everyday life. (2 marks)

(g) Explain what would happen if the spring was stretched beyond its elastic limit. (2 marks)

(h) Design an experiment to compare the stiffness of three different springs. (2 marks)

END OF PAPER

MARKING ALLOCATION

Section A (MCQ): 56 marks
Section B (Open-ended): 44 marks
Total: 100 marks

TIME ALLOCATION GUIDANCE

Section A: 45 minutes
Section B: 55 minutes
Checking: 5 minutes

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Answers

TuitionGoWhere P6 Science - WA1 2026 ANSWER KEY

Assessment: Weighted Assessment 1 (WA1)
Total Marks: 100 marks

SECTION A: Multiple Choice Questions - ANSWERS (56 marks)

(B) Photosynthesis - Plants make their own food through photosynthesis using light energy.
(B) Carbon dioxide, water, and light - These are the three requirements for photosynthesis.
(B) A push or a pull - This is the fundamental definition of force.
(C) Gravitational force - Gravity pulls objects toward Earth's center.
(C) The gravitational force acting on an object - Weight is gravitational force, not mass.
(B) Organisms of the same species living together - Population definition in ecology.
(C) Organisms that make their own food - Producers photosynthesize to create energy.
(C) Released as a waste product - Oxygen is a by-product of photosynthesis.
(B) Always opposes motion - Friction acts opposite to motion direction.
(C) Elastic potential energy - Stretched elastic materials store potential energy.
(C) Color of the pot - This doesn't affect photosynthesis or plant growth.
(C) Producers to consumers - Energy flows from food makers to food consumers.
(C) Many populations living together - Community includes all species in a habitat.
(B) Forces can change motion, direction, or shape - Forces have multiple effects.

[Continue with remaining MCQ answers...]

SECTION B: Open-Ended Questions - ANSWERS (44 marks)

Question 1 (15 marks)

(a) Light/Light energy (1 mark)

Accept: sunlight, light intensity

(b) Two controlled factors: (2 marks - 1 mark each)

Type/species of plant
Amount of water given
Temperature/room conditions
Size/age of plant
Type of soil/pot

(c) Predictions with reasons: (4 marks) Plant A: Will grow well/produce starch/stay healthy (1 mark) Reason: Receives light needed for photosynthesis (1 mark)

Plant B: Will not grow well/turn yellow/wilt (1 mark)
Reason: No light means no photosynthesis, so cannot make food (1 mark)

(d) Starch testing method: (4 marks - 1 mark per step) Step 1: Boil leaf in water to soften it Step 2: Boil in ethanol/alcohol to remove chlorophyll Step 3: Wash in water and flatten the leaf Step 4: Add iodine solution - blue-black color indicates starch

(e) Starch indicates photosynthesis: (2 marks) Sample answer: Starch is a product of photosynthesis. When plants photosynthesize, they convert glucose to starch for storage. Testing positive for starch shows that photosynthesis has occurred.

(f) Reliability improvement: (2 marks) Sample answers:

Use multiple plants of each type
Repeat experiment several times
Use plants of same age/size
Control temperature more precisely

Question 2 (14 marks)

(a) Producers: (2 marks) Water plants and algae

Accept either or both

(b) Two consumers: (2 marks - 1 mark each)

Small fish
Large fish
Water insects
Bird

(c) Role of bacteria: (2 marks) Sample answer: Bacteria are decomposers that break down dead organisms and waste, returning nutrients to the water for plants to use.

(d) Food chain construction: (3 marks) Sample answers:

Water plants → Small fish → Large fish → Bird
Algae → Water insects → Large fish → Bird Marking: 1 mark for correct sequence, 1 mark for correct arrows, 1 mark for appropriate organisms

(e) Effect of removing large fish: (3 marks) Sample answer: The small fish population would likely increase because their main predator is gone. This could lead to overgrazing of water plants and algae, potentially disrupting the balance of the pond ecosystem.

1 mark for small fish population increase
1 mark for explaining loss of predation
1 mark for secondary effect on plants/ecosystem balance

(f) Two physical factors: (2 marks - 1 mark each)

Water temperature
Oxygen levels in water
pH of water
Water depth/light penetration
Pollution levels

Question 3 (15 marks)

(a) Pattern in results: (2 marks) Sample answer: As the weight added doubles, the extension of the spring doubles. There is a direct proportional relationship between weight and extension.

(b) Prediction for 5 N: (2 marks) Prediction: 10 cm (1 mark) Method: Following the pattern, extension = 2 × weight, so 2 × 5 = 10 cm (1 mark)

(c) Force returning spring: (1 mark) Elastic spring force / Elastic force / Restoring force

(d) Energy type: (1 mark) Elastic potential energy

(e) Stiffer spring results: (3 marks) Sample answer: A stiffer spring would extend less for the same weights. The extensions would be smaller numbers, but the proportional relationship would remain. For example, 1 N might only extend it 1 cm instead of 2 cm.

1 mark for less extension
1 mark for maintaining proportional relationship
1 mark for example or explanation

(f) Everyday examples: (2 marks - 1 mark each)

Mattress springs
Shock absorbers in cars
Trampolines
Retractable pens
Hair clips

(g) Beyond elastic limit: (2 marks) Sample answer: The spring would become permanently stretched and would not return to its original shape. It might break or remain deformed even when the weight is removed.

(h) Experiment design: (2 marks) Sample answer: Apply the same weights to each spring and measure their extensions. Compare how much each spring extends for the same force - the one that extends least is stiffest.

1 mark for using same weights/forces
1 mark for measuring and comparing extensions

MARKING GUIDELINES:

General Principles:

Award marks for scientifically correct alternative wordings
Accept spelling errors if meaning is clear
Look for conceptual understanding over exact terminology
Give partial credit for method marks in calculations

Grade Boundaries:

A: 85-100 marks (85-100%)
B: 75-84 marks (75-84%)
C: 65-74 marks (65-74%)
D: 50-64 marks (50-64%)
Below 50 marks: Requires additional support