Question 1

The classification diagram below shows how two different sets of things are grouped.
How are the things classified?

Accepted Answer

According to their shapes.. Group A contains objects that are generally spherical or circular (soccer ball, bowl, button). Group B contains objects that are generally rectangular (book, ruler, box). Therefore, the classification is based on their shapes.

Question 2

A millipede curls up into a spiral when it is touched. Which characteristic of living things explains the millipede behaviour?

Accepted Answer

Living things respond to changes.. When a millipede is touched, it reacts by curling up. This act of reacting to a stimulus (being touched) is a fundamental characteristic of living things known as 'responding to changes'.

Question 3

Anders kept a beetle in a tightly closed container with food and water as shown below.
Anders' sister told him that the beetle would not be able to survive.
What must Anders do to allow the beetle to survive?

Accepted Answer

Poke some holes on the tightly closed lid.. Living things, including beetles, need air (oxygen) to survive through respiration. A tightly closed container prevents air exchange, leading to suffocation. Poking holes in the lid would allow air to enter, enabling the beetle to breathe.

Question 4

Based on the flow chart below, which letters represent bird's nest fern and papaya plant?

Accepted Answer

D, A. To identify the bird's nest fern:
- Is it a flowering plant? No (Bird's nest fern is a non-flowering fern).
- Does it grow in water? No.
This leads to D.
To identify the papaya plant:
- Is it a flowering plant? Yes.
- Does it live on land? Yes.
This leads to A.
Therefore, bird's nest fern is D and papaya plant is A.

Question 5

Study the animals below.
Based on the information given, how are the animals similar?

Accepted Answer

They have wings.. Both the parrot (a bird) and the mosquito (an insect) possess wings for flight. A parrot has feathers, but a mosquito does not. Neither animal makes its own food. A parrot has two legs, while a mosquito has six legs. Thus, having wings is the only common similarity among the given options.

P3 Science CA1 2025 — Ai Tong

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