P3 Science CA2 2025 — Nan Hua

Q: Susan placed three blocks, R, S and T, into a container of water. Her observation is shown below. She made the following statements: A. Only block T does not absorb water. B. Blocks S and T are made of different materials. C. Blocks R and S are made of the same materials. Which statement(s) can be concluded from her observation?

A. B only. From the observation, blocks R and S sink and are partially submerged at the bottom of the water (showing they may or may not absorb water — we cannot tell just from sinking), while block T floats. Floating/sinking depends on density, not directly on absorbency, so statement A cannot be concluded. Statement C (R and S are same material) cannot be concluded because two different materials can both sink. Statement B can be concluded: T floats while S sinks, so they must be made of different materials.

Q: The diagram below shows a coiled-up water hose. Based on the properties shown below, which material is most suitable for making the hose?

D. Material D — strong: yes, flexible: yes, waterproof: yes. A water hose must be strong (to withstand water pressure), flexible (to be coiled up and bent), and waterproof (to hold water without leaking). Only Material D has all three required properties.

Q: Which statement(s) about the life cycle of a grasshopper is/are not correct? A. A grasshopper has four stages in its life cycle. B. The start of the life cycle of a grasshopper is the egg stage. C. The life cycle of the grasshopper ensures the continuity of its own kind. D. The grasshopper goes through a repeated pattern of change in its life cycle.

A. A only. A grasshopper undergoes incomplete metamorphosis with three stages: egg, nymph, and adult — not four. So statement A is incorrect. Statements B, C and D are all correct descriptions of the grasshopper's life cycle. Only A is not correct.

Q: The diagram shows the life cycle of a plant. What is the stage marked W?

C. adult. The life cycle of a plant goes: seed → young plant (seedling) → adult plant (which produces fruits/seeds) → seed again. The stage W shows a large mature plant with developed leaves, fruits and roots, which is the adult stage.

Q: The graph below shows the number of days in the different stages of the life cycle of animal S. Based on the graph, how many days will it take for animal S to become an adult after it is hatched?

B. 25. After hatching, the animal is in the larva stage (10 days), then the pupa stage (15 days), before becoming an adult. The egg stage is before hatching and is excluded. Total days = 10 + 15 = 25 days.

P3 Science 2025 CA2 8 questions 20 marks

Source: Nan Hua, 2025

This P3 Science CA2 paper from Nan Hua (2025) contains 8 questions worth 20 marks. Use it as a study reference for Science topics typically tested at P3 level in Singapore schools.

Q1 MCQ 2 marks 🖼 Visual

Susan placed three blocks, R, S and T, into a container of water. Her observation is shown below. She made the following statements: A. Only block T does not absorb water. B. Blocks S and T are made of different materials. C. Blocks R and S are made of the same materials. Which statement(s) can be concluded from her observation?

Q2 MCQ 2 marks 🖼 Visual

The diagram below shows a coiled-up water hose. Based on the properties shown below, which material is most suitable for making the hose?

Q3 MCQ 2 marks

Which statement(s) about the life cycle of a grasshopper is/are not correct? A. A grasshopper has four stages in its life cycle. B. The start of the life cycle of a grasshopper is the egg stage. C. The life cycle of the grasshopper ensures the continuity of its own kind. D. The grasshopper goes through a repeated pattern of change in its life cycle.

Q4 MCQ 2 marks 🖼 Visual

The diagram shows the life cycle of a plant. What is the stage marked W?

Q5 MCQ 2 marks 🖼 Visual

The graph below shows the number of days in the different stages of the life cycle of animal S. Based on the graph, how many days will it take for animal S to become an adult after it is hatched?

Q6 Structured 3 marks 🖼 Visual

Study the flowchart below. (a) Based on the flowchart, which letters, W, X, Y or Z, best represent the objects below? Write the letter in the space below. Objects: fish tank; key. [2] (b) State the similarity between objects Y and Z. [1]

Q7 Structured 4 marks 🖼 Visual

Visual context

Two circular life-cycle diagrams side by side. Left: 'Life cycle of a cockroach' shows three stages — a small nymph, an adult cockroach, and an oval egg case — arranged in a cycle with arrows. Right: 'Life cycle of a butterfly' shows four stages — a cluster of eggs, a caterpillar (larva), a chrysalis (pupa) hanging from a branch, and an adult butterfly — arranged in a cycle with arrows. Below: a table with three columns labelled Week 1, Week 8 and Week 10. Week 1 shows four wormlike larvae. Week 8 shows two adult beetles on top and two pupae below labelled 'not moving around'. Week 10 shows four adult beetles. Below the table is an illustration of a boy (Kumar) pointing at a tray with two beetles and one wormlike larva inside; a speech bubble reads: 'Two larvae were eaten by beetles and two larvae died.'

The diagrams below show the life cycles of a cockroach and a butterfly. (a) State two differences between the life cycle of the cockroach and the butterfly. (Do not name the stages in the life cycles) [2] (b) Kumar observed four larvae of another insect kept in a container for 10 weeks. His observations were shown in the table below. Kumar explained what he observed in week 8: 'Two larvae were eaten by beetles and two larvae died.' Kumar's teacher told him his observations were not correct. Suggest what happened to the four larvae. [2]

Q8 Structured 3 marks 🖼 Visual

Jia Jia dipped four strips of different materials, A, B, C and D, into a tank containing coloured water as shown. After 10 minutes, she took the strips out of the tank and measured the height that the coloured water had travelled. The results are shown below. (a) Based on Jia Jia's experimental results, which material, A, B, C or D, would be most suitable for making a bath towel? Explain your answer. [2] (b) Other than the physical property tested in the experiment, state another property a bath towel must have to wrap around our body. [1]

P3 Science CA2 2025 — Nan Hua

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