P6 Science SA1 2025 — Anglo Chinese

The table shows the properties of substances X, Y and Z. A tick (✓) indicates that the substance has the property. Which one of the following best represents substances X, Y and Z? [Table of options: (1) X=Milk, Y=Oxygen, Z=Nitrogen; (2) X=Cloth, Y=Orange Juice, Z=Paper; (3) X=Paper, Y=Orange Juice, Z=Nitrogen; (4) X=Oxygen, Y=Cloth, Z=Milk]

Which of the following is not a function of the skeletal system?

Birds have different types of beaks to help them feed in the environment. Study the table carefully. Which two beaks have been correctly matched to their functions?

Luke set up the circuit shown. [Circuit diagram: a battery connects to a parallel network of five bulbs. Switch S1 controls the bulb on the far-left branch; switch S2 controls the top bulb branch; switches S3 and S4 each control one bulb on the right-hand branches. Closing all four switches lights all five bulbs.] All five bulbs were lit when all four switches, S1, S2, S3 and S4, were closed. Luke wanted the most number of bulbs to be lit when only one switch is closed. Which switch should he close?

The diagram shows a food web. [Food web: B → C; C → E; C → F; C → D; E → F; D → F; F → G.] Which of the following organisms are both prey and predator?

A wooden pendant was hung in the middle of a cardboard box with a lit torch as shown. Four tubes, A, B, C and D were placed in the box. Which tube(s) can be used to see the pendant inside the box?

Bala wanted to find out how the number of batteries affect the magnetic strength of an electromagnet. [Set-up A: 2 batteries, 6 coils of wire. Set-up B: 2 batteries, 12 coils of wire. Set-up C: 2 batteries, 12 coils of wire. Set-up D: 3 batteries, 6 coils of wire.] Which two set-ups should he use to investigate his aim?

Dylan released a toy car down a ramp as shown. The graph shows the amount of the different types of energy of toy car at point X. [Graph 1: Bar chart at point X showing Kinetic energy = tallest, Potential energy = medium (around the dashed reference line), Heat energy = very small.] He poured some sand on the ramp and released the toy car. Which graph shows the amount of different types of energy at point X after the sand was poured? [Option (1): Kinetic energy small (below dashed line), Potential energy tallest, Heat energy small. Option (2): Kinetic energy at the dashed line, Potential energy medium, Heat energy medium. Option (3): Kinetic energy tallest (above dashed line), Potential energy medium, Heat energy medium. Option (4): Kinetic energy below the dashed line (smaller than before), Potential energy unchanged at the dashed line, Heat energy increased (larger than before).]

The graph shows the population size of three different organisms, X, Y and Z, that live at different depths in the water which affects the amount of light the organisms receive. [Graph: x-axis = Depth of water (10–50); y-axis = Population size. Curve X starts high at shallow depth (10) and decreases as depth increases. Curve Y starts low at shallow depth, dips near 30, then rises sharply as depth increases. Curve Z is low at shallow depth and rises steeply as depth increases beyond 30.] Which organism(s) survive(s) better when there is more light?

The diagram shows the pathway of a baseball after it was thrown into the air. Which of the following statement(s) is/are true? W: There are no forces acting on the ball at point D. X: The baseball has maximum gravitational force at B. Y: A push force was exerted on the baseball at point A. Z: Heat is produced as the ball rolls along from point C to point D.

(a) Draw three arrows (→) in the diagram to show how food is transported in the four parts of a plant. [1] Ben removed the food-carrying tubes of the tomato plant by making a cut around the stem at part X as shown. [Diagram: tomato plant with a cut around the stem at part X, with a tomato fruit growing below the cut.] After a week, Ben observed that the tomato fruit which was growing below the cut became smaller and shriveled up. (b) Explain Ben's observation. [2]

Devi built a musical toy as shown. She used two identical batteries, a bulb, a switch and a sound box, S. When the switch was closed, the bulb lit up and the toy played music. When the bulb fused, the toy could still play music. (a) Use a pencil to draw the wires in the circuit that Devi has set up in her toy. [Diagram: box with components placed inside — S (sound box) on the left, two batteries on the right side, a bulb at the centre-bottom, and two dots at the top representing the switch.] [2] (b) State one way that Devi can increase the brightness of the bulb in her toy. [1] (c) Mark on the circuit with an X where Devi should add another switch so that she can use the toy only as a night light. [1]

Mrs Lum placed a packet of fish balls at room temperature into a pot of boiling soup as shown. (a) The temperature of the soup decreased after the fish balls were added. Give a reason why. [1] (b) It takes 15 minutes to cook a packet of fish balls. How will the time taken to cook the fish balls change if Mrs Lum cooks two packets of fish balls in the same pot using the same volume of hot soup instead? Explain why. [1] Mrs Lum steamed some buns with chocolate filling as shown in diagram 1. [Diagram 1: pot of water on a flame, with buns containing chocolate filling at 30°C placed inside the pot.] [Diagram 2: after 10 minutes, the bun has heated to 80°C and the chocolate filling (at 90°C) bursts through the wall of the bun.] (c) After steaming the buns for 10 minutes, the chocolate filling burst through the walls of the buns as shown in diagram 2. Explain why. [2]

Henry conducted an experiment with the set-up shown. After he lighted the candle, he observed that the paper spiral started to spin. (a) Fill in the boxes to show the main energy changes. [Diagram: four boxes connected by arrows — Box 1: ____ energy (candle) → Box 2: ____ energy (lit candle) → Box 3: ____ energy (air above candle) → Box 4: ____ energy (spinning paper spiral).] [2] (b) Suggest one change Henry can do to the same paper spiral to make it spin faster. [1]

Miss Lim placed two button magnets over a worksheet on the whiteboard as shown. (a) Name the force(s) acting on the worksheet. [1] Miss Lim wanted to find out how the size of a button magnet affects its magnetic strength. She conducted an investigation using three different-sized magnets, A, B and C. [Diagram: magnet A (largest), magnet B (medium), magnet C (smallest).] She continued placing stacks of worksheets on top of one another and counted the maximum number of worksheets that could be placed before the button magnets fall off the whiteboard. She recorded her results as shown. [Table: Magnet A — 6 worksheets; Magnet B — 5 worksheets; Magnet C — 8 worksheets.] (b) What can Miss Lim conclude from her experiment? [1] (c) Miss Lim used identical worksheets to stack on top of each other. Explain why using worksheets of the same size ensures a fair test. [1]

(a) What is a community? [1] There are four populations, Q, R, S and T, in community U. The information about these populations is as follows: • R feeds on Q. • T feeds on Q and R. • S is eaten by Q and T. (b) In the space below, draw a food web to represent the relationship among the four populations. [2] (c) Which organism is a plant-and-animal-eater? Explain your answer. [1] (d) A disease caused a sharp decrease in the population of organism R. Explain how this will affect the population of organism S. [1]

Cacti are plants that can be found in the desert, where temperatures can be extremely high during the day and very low at night. Water is scarce, and the environment is dry and harsh. Cacti have needle-like leaves which help them survive for long periods without rain. (a) Give a reason how having spines instead of leaves help the cacti survive in the desert. [1] (b) State another structural adaptation of the cacti that helps them survive long periods without rain. [1] Bird C is an organism that lives in the cacti and feeds on the nectar of the cacti flower as shown in diagrams 1 and 2. [Diagram 1: bird C inside the cacti. Diagram 2: bird C feeding on the cacti flower.] (c) How does Bird C and the cacti benefit from one another? Benefit to bird C: ____ Benefit to cacti: ____ [2]

Ali wanted to find out if the presence of a wing-like structure affects the distance travelled by fruit X. He conducted an experiment with the following materials: [Table of materials: fan, two fruit X with wing-like structure, measuring tape.] (a) List down the steps Ali took to conduct his experiment to investigate his aim. [2] (b) State two variables to keep constant to ensure a fair test. [1] (c) State an advantage to the young plant when the fruit travels a further distance from the parent plant. [1]