Question 1

Which of the following is correct for both the cockroach and the frog?

Accepted Answer

C. Both have three stages in their life cycle.. Cockroach (egg → nymph → adult) and frog (egg → tadpole → adult) both have 3 stages in their life cycle. Cockroach lays eggs on land, frog in water; cockroach young look like adult, frog young (tadpole) do not.

Question 2

The diagram shows animal X. Which statement is correct?

Accepted Answer

D. Animal X must be an amphibian.. The combination of moist skin, webbed feet, gills (and a tail like a tadpole) describes an amphibian (e.g. axolotl/young frog stage). Fish do not have webbed feet; reptiles and mammals do not have moist skin or gills.

Question 3

Which part of the plant holds it upright?

Accepted Answer

C. (3) stem. The stem (labelled 3) supports the plant and holds it upright. Roots anchor and absorb water; leaves make food; fruit holds seeds.

Question 4

The diagrams below show the human and plant reproductive systems. In the systems above, identify the parts where female reproductive cells are produced.

Accepted Answer

A. Human: P, Plant: T. Female reproductive cells (eggs/ovules) are produced in the ovary. In the human system the ovary is labelled P (the side organ) — answer key gives option 1 → P and T. In the flower the ovary at the base of the pistil is labelled T.

Question 5

The diagram shows the human digestive system. Where do/does the absorption of digested food take place?

Accepted Answer

B. D only. Digested food is absorbed mainly in the small intestine (D). The large intestine absorbs water, not digested food.

Question 6

Ali observed 2 different types of cells under the microscope as shown below. Which of the following statements about the two cells is not correct?

Accepted Answer

D. Both cells have a cell membrane that prevents them from bursting.. The cell membrane controls what enters/leaves the cell — it does not prevent bursting. Only the plant cell's rigid cell wall prevents it from bursting, so statement 4 is not correct.

Question 7

Which of the following is a cause of global warming?

Accepted Answer

C. more trees being cut down. Cutting down trees (deforestation) is a cause of global warming because fewer trees absorb CO₂. The other options are effects of global warming, not causes.

Question 8

The diagram shows Animal Y. Animal Y is a plant-eater that lives among the trees. It is known to move very slowly. Surprisingly, it's a good swimmer. The fur of Animal Y may appear green at times due to algae growth. Which of the following correctly explains how adaptation helps it to survive?

Accepted Answer

D. long curved claws — to grip branches easily. Long curved claws allow the sloth to grip branches easily so it can hang from trees. Green fur camouflages it from predators (not to attract mates); it is a plant-eater (no prey); the snout is not used to breathe underwater.

Question 9

Study the diagram below. Which of the following is likely the fruit of plant W? [Figure: Four fruit options — (1) hairy/spiky burr-like fruit, (2) coconut-like fruit with hard husk, (3) pod-like fruit, (4) winged fruit.]

Accepted Answer

B. coconut-like fruit with hard husk. The young plants appear downstream across the river, so the seeds are dispersed by water. A coconut-like fruit with a hard, fibrous, waterproof husk that floats is the typical water-dispersed fruit.

Question 10

The table shows the heart rates of Cheryl and Ken during an exercise. Based on the information, which of the following statements can be concluded?

Accepted Answer

C. Ken's heart rate increased more than Cheryl's heart rate during the exercise.. Ken's heart rate increased by 148−74 = 74 bpm while Cheryl's increased by 125−72 = 53 bpm, so Ken's increased more. We cannot tell about blood volume or whether their maximums have been reached.

Question 11

The diagram below shows the direction of blood flow in a body. The same amount of blood was taken from blood vessels, A, B, C and D. Which graph shows the correct comparison of the amount of carbon dioxide in the blood of these blood vessels? [Figure: Four bar-graph options comparing two vessels each — (1) A>B, (2) A>C, (3) C>A, (4) B>D.]

Accepted Answer

C. C > A. C carries deoxygenated blood from heart to lungs (high CO₂); A carries oxygenated blood from lungs to heart (low CO₂). So C should have more CO₂ than A.

Question 12

Study the food chain shown below. E → F → G → H. Three students made the following statements: Student A: Organism E gets its energy from the Sun directly. Student B: If all of organism H migrate to another location, the population of F will decrease. Student C: If a disease kills all of organism F, only the population of organism E will decrease. Whose statement(s) is/are correct?

Accepted Answer

B. Students A and B only. A is correct — E is the producer that gets energy from the Sun. B is correct — without H, G increases, so G eats more F, making F decrease. C is wrong — if F dies, G and H also decrease (not only E increases).

Question 13

John placed some animals, X, Y and P, in a tank with some leaves to study the food relationship among them. He counted the number of animals at the end of each week. After three weeks, he removed animal Y. John's results are shown below. Animal P feeds on leaves only. None of the animals had any disease. Which of the following is correct?

Accepted Answer

A. Animal Y fed on animal X.. After Y was removed at week 3, X's population increased — meaning Y had been preying on X (predation pressure removed). Hence Y fed on X.

Question 14

Zoe placed a plant under bright sun for three hours. She used two bags, P and Q, made of different materials to wrap two leaves each as shown and started measuring the amount of carbon dioxide in each bag. Which graph represents the change in the amount of carbon dioxide in each bag during the three-hour period? [Figure: Four graph options showing CO₂ vs time for P and Q.]

Accepted Answer

D. P decreases more; Q decreases less. In bright sun, both leaves photosynthesise and use up CO₂. The transparent bag P lets in more light, so its leaves photosynthesise faster and use more CO₂ (P decreases more). Translucent Q gets less light, so its CO₂ decreases more slowly.

Question 15

The diagram shows the path of a football after Ken had kicked it and just before it touched the ground at B. What type of energy did the football have at points A and B?

Accepted Answer

C. A: kinetic and potential energy; B: kinetic energy. At A (highest point) the ball is still moving forward and is high, so it has both kinetic and potential energy. At B (just before touching the ground) the height is 0 so PE is 0; it is still moving, so it has only kinetic energy.

Question 16

After a party ended, the air in a bouncy castle was let out. Which of the following explains the deflated bouncy castle?

Accepted Answer

B. Air occupies space.. The castle is inflated because air inside takes up space. When the air is let out, there is nothing occupying the space inside, so it deflates — showing that air occupies space.

Question 17

The diagrams show the interaction among four unknown objects, J, K, L and M. Which object(s) is/are definitely a magnet?

Accepted Answer

C. K, L and M only. From the three setups, K, L and M can each be shown to attract another object across a gap (or in opposing orientations), confirming they are magnets. J's behaviour is consistent with being a magnetic material attracted by a magnet but not necessarily a magnet itself.

Question 18

Kyle wanted to compare three objects, A, B and C. Using a beaker filled with the same amount of water each time, he put in the objects as shown below. Which one of the conclusions that Kyle made is correct?

Accepted Answer

B. B is heavier than A.. Mass of A = 40−20 = 20 g; mass of C = 30−20 = 10 g; mass of (B+C) = 70−20 = 50 g, so mass of B = 40 g. B (40 g) is heavier than A (20 g). C is the lightest, not the heaviest; volume cannot be deduced from these readings directly.

Question 19

The diagram shows a clear pouch commonly used to protect a mobile phone during wet activities. It enables the user to press the screen and continue using the mobile phone. Which material is most suitable for making part X of the pouch? [Table: Properties — flexible, waterproof, allows light to pass through, for materials A–D. A: ✗, —, ✓. B: ✗, —, ✓. C: —, —, ✗. D: —, ✓, ✓.]

Accepted Answer

D. D. Part X must be flexible (so user can press the screen), waterproof (to protect phone from water) and allow light to pass through (so screen is visible). Only material D satisfies all the required properties.

Question 20

Jack could easily ride a bicycle on his own. However, he found it much harder to pedal when Tom stood at the back of the bicycle as shown below. Which of the following is the best explanation?

Accepted Answer

D. The moving wheels of the bicycle were going against a greater frictional force.. With Tom on the bicycle, the total weight pressing down increases. This increases the frictional force between the wheels and the ground, making it harder for Jack to pedal.

Question 21

The set-up below shows how clean water can be collected from sea water. Which of the following would increase the amount of clean water collected within a short period of time?

Accepted Answer

B. Using a cool metal plate. To increase clean water collected, condensation of water vapour on the plate must be faster. A cooler plate causes faster condensation, and a metal plate is a better conductor of heat (loses heat from vapour more quickly) than glass, so a cool metal plate is best.

Question 22

The diagram shows an archer aiming at the target. To shoot an arrow, he needs to pull the bow string back before releasing it. Which of the following best represents the energy conversions involved in shooting an arrow from the point of release?

Accepted Answer

C. potential energy (string) → kinetic energy (string) → kinetic energy (arrow). At the point of release the stretched string has elastic potential energy. When released, it moves (kinetic energy of string) and transfers this to the arrow (kinetic energy of arrow).

Question 23

Which bulb, P, Q, R or S, will be the brightest?

Accepted Answer

C. R. Bulb R is in a parallel branch powered by three batteries in series, giving each bulb the full battery voltage from three cells — the highest voltage across a single bulb of the four circuits — so R glows the brightest.

Question 24

Four rods made of different materials are placed in various positions, A, B, C and D, of the electrical circuit shown below. Only one bulb lit up. Which of the following shows the correct positions of the rods? [Table: Conductor / insulator — (1) A,B,C / D; (2) A,B,D / C; (3) A,C,D / B; (4) B,C,D / A.]

Accepted Answer

D. Conductor B,C,D; Insulator A. Only one bulb lights up — the others must be in an open branch. With the insulator at A, the path through A is broken so the bulbs needing A are off, while the loop through B, C, D (all conductors) completes only one bulb's circuit. So conductors are B, C, D and insulator is A.

Question 25

The table below shows the time taken for an ice cube to melt on four materials, A, B, C and D. The picture below shows a defrosting tray used for thawing frozen meat. [Figure: Defrosting tray with frozen meat on top; meat becomes soft when thawed.] Which material should be used to make a defrosting tray that will thaw the frozen meat fastest?

Accepted Answer

B. B. The fastest-thawing material conducts heat fastest — it melted the ice cube fastest. B took only 1 min, the shortest time, so B is the best conductor of heat and should be used.

Question 26

George has three boards made of different materials. He cut out shapes of the same height and width as shown below. He placed the three boards at positions, A, B and C, as shown below. [Figure: Lamp on left, three boards at A, B, C in front of a screen on the right.] The board at position A is the only board made of a material that allows light to pass through. The diagram below shows the shadow that he noticed on the screen. [Figure: A black square shadow with a white circle in the centre.] Based on his observation, which of the following shows the correct positions of the boards in the setup?

Accepted Answer

C. Circle: C, Triangle: A, Square: B. Board A is transparent and lets light through its cut-out shape — that shape appears as the bright (white) area, which is a circle, so the circle is on A? No — the white area is the unblocked light. The shadow shows a square outline with a circular bright patch — meaning the square-cut board must be CLOSEST to the screen so its silhouette dominates (square shadow), and the triangle-cut board (opaque) and the circle-cut board (transparent, lets a circle of light through nearer the lamp) combine. The opaque triangle board placed at A would block light, but A is transparent — so the transparent board (lets full light through except blocked parts) has the circle cut-out, giving a circle of light through A. Final answer: Circle = A (transparent — its cut-out passes light forming the central circle), Triangle = nearest the screen creating the larger outer shadow, Square = ... Per the answer key the correct mapping is Circle on C, Triangle on A, Square on B.

Question 27

The diagram below shows the side view of a beverage dispenser before and after Can A was taken out. The remaining cans moved forward after Can A was taken out. What would happen to the spring when all the cans were removed?

Accepted Answer

C. The spring would return to its original length.. When all cans are removed, no load opposes the spring. The stretched spring would pull back fully and return to its original (unstretched) length.

Question 28

John released a wooden block from the top of the plastic plank. It moved down and stopped at the bottom of the plank. The different forms of energy of the wooden block at position Q are shown in the graph below. [Figure: Bar graph at Q on plastic plank — PE=50, KE=40, HE=10 units.] The wooden block was then released from the top of a wooden plank. It moved down more slowly. Which of the following graphs shows the correct result of the wooden block when it was at position Q of the wooden plank? [Figure: Four bar-graph options — (1) PE=50, KE=30, HE=10; (2) PE=60, KE=30, HE=10; (3) PE=50, KE=30, HE=20; (4) PE=30, KE=50, HE=20.]

Accepted Answer

C. PE=50, KE=30, HE=20. At the same height Q the PE is the same (50). A wooden plank has more friction than plastic, so more KE is converted to heat — KE decreases (50→30 means 20 less) and HE increases (10→20). Total energy is conserved: 50+30+20 = 100, same as original 50+40+10. Hence option (3).

P6 Science SA2 2025 — Tao Nan

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