Question 1

Which of the characteristics below describes both insects and birds?

Accepted Answer

C. They reproduce by laying eggs.. Insects and birds both reproduce by laying eggs (oviparous). Insects have three body parts but birds do not. Both have young that look different from adults to varying degrees, and they have different body coverings (exoskeleton vs feathers).

Question 2

Study the classification diagram below. Which of the following represents X and Y correctly?

Accepted Answer

B. X = fern, Y = sand. X is under 'Living things' and Y is under 'Non-living things'. A fern is a living thing and sand is a non-living thing, so X = fern and Y = sand is correct.

Question 3

Study the pictures below. Which of the following statements about both plants is correct?

Accepted Answer

B. Both plants produce flowers.. Plant X (a tree with fruit) and Plant Y (a flowering plant on a pole) both produce flowers because fruits develop from flowers. Both reproduce from seeds (not spores), both need air, and both make their own food.

Question 4

The diagram below shows the life cycle of a tomato plant. Which of the following statements describing the life cycle of the tomato plant is false?

Accepted Answer

C. Light is needed for every stage of the tomato plant's life cycle.. Light is NOT needed at every stage of the tomato plant's life cycle. Seeds germinate in the dark (do not need light). Water is needed at all stages, the life cycle does ensure continuity, and tomato and chili plants share the same life cycle (seed → young plant → adult plant).

Question 5

Study the things in groups A and B. Which of the following statements about the above things is correct?

Accepted Answer

D. Only the things in Group B need air, water and food to survive.. Group A (umbrella, key) are non-living. Group B (snake, fern) are living things and need air, water and food to survive. Group A items cannot grow, reproduce, or respond. Only Group B is alive.

Question 6

The diagram below shows a raincoat. Plastic is a suitable material for making a raincoat because it is ____. (A) fragile (B) flexible (C) waterproof (D) absorbent

Accepted Answer

C. B and C. A raincoat must be flexible (so the wearer can move) and waterproof (so rain does not soak through). It should NOT be fragile or absorbent. So B (flexible) and C (waterproof) are correct.

Question 7

Amy set up an experiment as shown below using frogs and containers of a similar size. In which set-up will the frog stay alive the longest?

Accepted Answer

B. Set-up B. A frog needs air, food and water to survive. Set-up B has a net (allows air in), flies (food), and 50 ml of water. Set-up A lacks water; Set-up C has a plastic cover (no air); Set-up D lacks food (no flies). Only B provides all three.

Question 8

Study the diagram below. Which list of animals below matches X, Y and Z?

Accepted Answer

D. X = chicken, Y = whale, Z = fish. X has feathers → chicken. Y has hair → whale (mammals have hair). Z has scales → fish. The chicken/whale/fish combination matches X, Y, Z respectively.

Question 9

The diagram below shows some animals. Which of these animals are insects?

Accepted Answer

B. A and C only. Insects have 3 body parts and 6 legs. A (ant) and C (grasshopper) are insects. B is a spider (8 legs, arachnid). D is a centipede (many legs, myriapod). So A and C only.

Question 10

Study the animals below carefully. Which of the following classification charts can be used to classify animals P, Q, R and S into 2 groups?

Accepted Answer

D. Living Things → With wings / Without wings. P (mosquito) has wings, Q (fly) has wings, S (owl) has wings, but R (lizard/gecko) has no wings. This cleanly splits them into two groups: with wings (P, Q, S) and without wings (R). The other classifications do not split all four into 2 valid groups.

Question 11

Study the flowchart below. Based on the flowchart above, which of the following would be a suitable heading for P?

Accepted Answer

C. opaque objects. P groups copper sheet and iron bar; Q groups sunglasses and tracing paper (allow some light – translucent); R groups clear glass and tap water (transparent). Copper sheet and iron bar are opaque (do not allow light through), so P = opaque objects.

Question 12

The diagram below shows the stages in the life cycle of a mosquito. Which of the following best represents stages X and Y?

Accepted Answer

B. Stage X = egg, Stage Y = pupa. The mosquito life cycle is egg → larva → pupa → adult. Following the arrows: Stage X comes before larva → egg; Stage Y comes after larva and before adult → pupa. So X = egg, Y = pupa.

Question 13

Study the flow chart below carefully. Which of the following pairs of animals represents A and B respectively?

Accepted Answer

C. A = mosquito, B = bird. A has six legs and lays eggs → insect like mosquito. B has no six legs, can fly and has feathers → bird. So A = mosquito and B = bird.

Question 14

Study the characteristics of organism Z below. Organism Z: Can be seen only with a microscope; Needs air, food and water; Can be useful or harmful. What could organism Z be?

Accepted Answer

C. Bacteria. Only bacteria are microscopic (require microscope to see). Bacteria need air, food, and water, and can be useful (e.g. in digestion) or harmful (cause disease). Ferns, moss and mushrooms are visible to the naked eye.

Question 15

Three pupils made the statements below. Andrea: 'Fungi are plants.' Benny: 'Mushrooms, ferns and yeast are fungi.' Caleb: 'Fungi can grow in dark places.' Who is/are correct?

Accepted Answer

C. Caleb only. Andrea is wrong: fungi are NOT plants (they cannot make their own food). Benny is wrong: ferns are plants, not fungi. Caleb is correct: fungi do not need light to grow and can grow in dark places. So only Caleb is correct.

Question 16

4 similar seeds A, B, C and D from the same plant are placed under different conditions as shown in the table below. Which seed will germinate the fastest?

Accepted Answer

C. C. Seeds need water, air and warmth to germinate (light is not needed). Seed C has water, air, and warmth (30°C). Seed A lacks water. Seed B has water/air but only 10°C (cold). Seed D lacks air. C provides all necessary conditions plus warmth, so it germinates fastest.

Question 17

Beth carried out an experiment with a bar magnet and 4 objects, P, Q, R and S. She placed the south pole of the bar magnet close to different ends X and Y of each object. The table below describes her observations. Which of the following would correctly describe the materials that each object was made of?

Accepted Answer

B. P = Nickel, Q = Plastic, R = Magnet, S = Magnet. P is attracted at both ends → magnetic material (Nickel). Q is not attracted at either end → non-magnetic (Plastic). R is repelled at one end and attracted at the other → magnet. S is attracted at one end and repelled at the other → magnet. So P=Nickel, Q=Plastic, R=Magnet, S=Magnet.

Question 18

The bar graph below shows the number of days taken during each stage of the life cycles of insects P and Q. At which stage would insects P and Q be on the 9th day after the eggs were hatched?

Accepted Answer

B. Insect P = pupa, Insect Q = larva. After the eggs hatched (i.e. excluding the egg stage), counting from day 1: Insect P spends 6 days as larva (days 1–6), then becomes pupa (day 7 onwards). On day 9, P is in pupa. Insect Q spends 10 days as larva (days 1–10). On day 9, Q is still a larva. So P = pupa, Q = larva.

Question 19

Carrie placed a ball at the edge of a table. She moved object X towards Y without touching Y. The ball was pushed off the table by object Y. Which of the following best describes what object X, object Y and the ball are?

Accepted Answer

C. Object X = magnet, Object Y = magnet, Ball = copper. X moves Y without touching → magnetic repulsion, so X and Y must both be magnets with like poles facing. The ball was pushed off (not attracted), so the ball must be non-magnetic, e.g. copper. (A is wrong because steel ball would be attracted to magnet Y; B is wrong because Y is iron and iron can't repel; D is wrong because X is copper and copper can't move a magnet.) So X = magnet, Y = magnet, ball = copper.

Question 20

Diana conducted an experiment using four magnets A, B, C and D with the set-up shown below. She lowered magnet A towards the nails. She stopped once all four nails are attracted by the magnet. She then measured, d, the distance between the magnet and the iron nails. She repeated the experiment with magnets B, C and D. The table below shows the distance when each magnet was able to attract all four iron nails. Which magnet has the greatest magnetic strength?

Accepted Answer

A. A. The stronger the magnet, the further away it can still attract the nails. Magnet A attracts all four nails from 18 cm away, the greatest distance. So magnet A has the greatest magnetic strength.

P3 Science SA2 2023 — Singapore Chinese Girls

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