Question 1

Adam dropped two plates, A and B, onto the floor. Plate A broke into pieces but plate B did not.
Which one of the following shows correctly what plates A and B are made of?

Accepted Answer

A. ceramic, metal. Plate A broke, which indicates it is brittle. Plate B did not break, which suggests it is durable or tough. Ceramic is known to be brittle, while metal is generally durable and less likely to break upon impact compared to ceramic.

Question 2

Which of the following material is the most suitable for making part X of an umbrella?

Accepted Answer

D. plastic. Part X of an umbrella refers to its frame or ribs. For an umbrella frame, the material should be lightweight, waterproof, and reasonably flexible and durable. Plastic fits these criteria well. Wood would be heavy and prone to water damage (rot). Glass is brittle and would easily break. Metal could be suitable but can be heavier and prone to rust, making plastic a more common and suitable choice for this part.

Question 3

The table below shows the properties of materials W, X, Y and Z.
A tick (✔) shows that the material has the property.
Ali wanted to make a pair of reading glasses as shown below.
Which material is most suitable to make part A of the reading glasses?

Accepted Answer

D. Material Z. Part A of the reading glasses is the lens. Lenses must allow light to pass through them (be transparent) and also be waterproof to maintain clear vision in various conditions. Material Z is the only material in the table that possesses both the 'Waterproof' (✔) and 'Allows light to pass through' (✔) properties, making it the most suitable for a lens.

Question 4

Jane wanted to find out how the positions of an empty plastic bottle and a marble ball are different when the two objects are placed in the water.
Which positions, A, B or C, are the most likely positions of the empty plastic bottle and the marble ball when placed in the water?

Accepted Answer

D. A, C. An empty plastic bottle with a cap contains air, making its overall density less than water, so it will float on the surface (Position A). A marble ball is dense and heavy, causing it to sink to the bottom of the water (Position C).

Question 5

Which of the following shows the life cycle of a butterfly?

Accepted Answer

B. egg -> larva -> pupa -> adult (cycle shown). The life cycle of a butterfly is an example of complete metamorphosis, which consists of four distinct stages: egg, larva (caterpillar), pupa (chrysalis), and adult. Both options A and B correctly represent this sequence. Option C shows an incorrect sequence (adult before pupa and larva). Option D incorrectly uses 'nymph', which is part of an incomplete metamorphosis life cycle (e.g., grasshopper), not a butterfly's.

Question 6

Which of the following statement(s) is/are true about flowering plants?
A The seed is the final stage of the life cycle of a flowering plant.
B All flowering plants have three stages in their life cycles.
C Only the adult flowering plants can have fruit.

Accepted Answer

C. B and C only. Statement A is false. The seed is an early stage that germinates to grow into a new plant, not the final stage. The adult plant (which produces flowers, fruits, and seeds) is typically considered the final stage before decomposition or the start of a new cycle.
Statement B is generally considered true in primary science, where the life cycle is simplified to three main stages: seed, seedling, and adult plant.
Statement C is true. Fruits develop from the flowers of mature, adult flowering plants after pollination and fertilization. Young plants (seedlings) do not produce fruit.
Therefore, statements B and C are true.

P3 Science CA2 2025 — Ai Tong

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