P6 Science SA2 2025 — Catholic High

Study the table. [Table 1: Can move from place to place — mosquito, dolphin, whale, frog. Cannot move from place to place — mushroom, mould, fern, grass.] The same list of organisms can be regrouped as shown. [Table 2: A — mushroom, mould; B — grass, fern; C — mosquito, frog; D — whale, dolphin.] Which of the following shows the possible headings for A, B, C and D?

Study the diagram. [Flowchart: Organisms → Does it give birth to young alive? Yes → lion; No → Question X; Yes → A, No → B.] Which best represents organism A, organism B and question X?

Joshua inflated two balloons in different ways. He pumped air into balloon A using an air pump and blew air into balloon B. Which graph best represents the composition of oxygen, water vapour and carbon dioxide in balloons A and B?

Study the diagram. [Flowchart: food we eat → system X → digested food → system Y → all parts of the body; system X also outputs undigested food → out of body. Separately: air → system Z → gas M.] Which statement is correct? (1) Gas M is carbon dioxide. (2) System X breaks down food into mineral salts. (3) In system Z, carbon dioxide is converted to oxygen. (4) System Y removes carbon dioxide and waste from the body.

The diagram shows a plant. [Plant diagram: W = flower, X = leaf, Y = stem, Z = roots.] In which parts of the plant are the water-carrying and food-carrying tubes found?

Andy wanted to find out if plants take in water through their roots. Which two set-ups should he use? [Set-ups: (1) 300 ml blue water with plant vs 400 ml plain water with plant; (2) 300 ml blue water with plant vs plain water with plant (smaller amount); (3) 300 ml blue water with plant vs empty beaker; (4) 300 ml plain water with plant vs 300 ml blue water with plant.]

The table shows three cells, P, Q and R. A tick (✓) indicates the presence of the cell part. Based on the table, which statement is correct?

The pictures show a stage in the life cycle of a beetle and a butterfly. [Pictures: larva (mealworm) and larva (caterpillar).] How are the mealworm and caterpillar similar at this stage of their life cycle?

Siti conducted an experiment using two animal-pollinated flowers, A and B, from the same plant. One of the flowers is shown. [Diagram of flower with parts labelled P (stamen/anther), Q (ovary), R (stigma/style), S (petal).] She removed a part from flower A and a different part from flower B. She observed and recorded which flower could form a fruit. Which of the following correctly shows the part of each flower that has been removed?

Ahmad investigated the conditions needed for the germination of green beans. He prepared three set-ups, J, K and L, each containing the same amount of cotton wool and the same number of green beans. [Diagram of dish with cotton wool and green beans.] The table shows the conditions that each set-up was exposed to for a few days. Which observation correctly matched the conclusion? [Options listed in the table.]

The diagram shows a leaf with green and white areas which was partly covered by black papers as shown. [Diagram of variegated leaf with A (green area covered by black paper), B (green area not covered), C (white area not covered).] The plant was then placed in the sun. After several hours, the leaf was removed and the black papers were taken off. The leaf was tested for the presence of food. Which part(s), A, B and C, of the leaf is/are food most likely found?

Which of the following shows the correct example of a behavioural and a structural adaptation? [Table of options.]

Natalie counted the organisms that were observed in the school garden and recorded her findings. Which conclusion(s) could be drawn from the table? A — There were 20 insects. B — There were 20 populations of plants. C — The animals made up one garden community.

Study the food web. [Food web: P → R; P → Q; P → V; P → U; R → U; U → T; T → S; V → S; Q ← P (P eaten by Q? Arrow direction indicates Q is eaten — arrow from P to Q means P is eaten by Q).] Which statement(s) is/are correct? A — S is a producer. B — Q and U feed on plants only. C — V and T are both predator and prey.

Study the diagram. [Classification: Materials → A (eraser, balloon); B (mirror, window pane); C (wire, keys).] Which of the following shows the correct headings of A, B and C?

Each of the circuits, A, B and C has a steel rod, a glass rod and a wooden rod. Identical batteries and bulbs in working condition are used. In which circuit(s) will the bulb light up?

In which circuit will bulb L light up the most brightly? [Diagrams: (1) 1 bulb L, 1 battery; (2) 2 bulbs in parallel, 1 battery; (3) 1 bulb L, 2 batteries; (4) 2 bulbs in parallel, 2 batteries.]

An experiment was set up using a sealed container holding air and water as shown. 100 cm³ of water was removed from the container through the tap and 300 cm³ of air was then pumped in using the pump. Which statement is correct at the end of the experiment?

Lucas wanted to find out how the volume of substance X relates to its mass. He measured the mass and volume of some substance X. Which actions should he take to ensure the accuracy and reliability of his results? A — Repeat the experiment two more times. B — Repeat the experiment with different substances. C — Measure the volume of substance X with a measuring cylinder. D — Keep the temperature of substance X constant during the experiment.

A solid made of three different substances, M, N and P, is placed in the set-up as shown. The table shows the melting points and volumes of the three substances. [Table: M melting point 65°C volume 100 cm³; N melting point 58°C volume 20 cm³; P melting point 115°C volume 20 cm³.] What is the most likely volume of liquid collected in the dish when the solid is heated to 60°C?

John wanted to collect some water from seawater. He placed the set-up under the sun for a few hours. What changes could he make to the set-up to collect more water in the same amount of time? A — Use a wider cup. B — Add more seawater. C — Use a metal container. D — Add ice cubes on the plastic sheet.

A lit candle and a bear are placed behind a wooden screen as shown. Which statement explains why Lene cannot see the bear?

Junwei set up the following experiment in a dark room. The light sensor on the screen gave a reading of 30 units. As Junwei moved one object in the set-up, the reading on the light sensor increased slowly to 40 units and then dropped to 0 units suddenly. Which object did Junwei move and in which direction?

Which of the following are sources of energy? A — Sun. B — wind. C — fossil fuels. D — running water.

A balloon-powered toy car was inflated with air before it was released at point A. It moved forward to point B and continued moving to point C where it came to a stop. Which statement is not correct about how the car moves?

The diagram shows a man swinging the bat to hit a ball. Which of the following are most likely to happen after he hits the ball? A — The ball changes speed. B — The ball changes direction. C — The ball stops immediately. D — The ball decreases in mass.

Pei Ling throws a ball downwards to hit the net. After hitting the net, the ball bounces upwards. What force causes the ball to bounce back?

Suling conducted an experiment. She placed a steel block on the electronic scale as shown in figure 1 and recorded the reading. In figure 2, a bar magnet was brought near the steel block and the new reading was recorded. She repeated the steps with a wooden block and a button magnet. Her results are as shown. [Table: Steel block — Figure 1: 14.0g, Figure 2: 12.0g. Wooden block — Figure 1: 14.0g, Figure 2: 14.0g. Button magnet — Figure 1: 14.0g, Figure 2: 16.5g.] Based on Suling's observations, which conclusion(s) can be made? A — A force is pulling the steel block upwards. B — The bar magnet attracted the button magnet. C — The bar magnet has no effect on the wooden block.

Jake set up an experiment to find out if the number of leaves affects the amount of water taken in by the plant as shown. The set-ups were placed near a window for two days. His results are as shown. [Table: Set-up K: 6 leaves, 200 ml start, 180 ml after two days. Set-up L: 10 leaves, 200 ml start, 150 ml after two days.] (a) Explain why there was less water in beaker L than beaker K after five days. [1] (b) Jake wanted to find out how the amount of roots affect the amount of water taken in by the plants. Using the same set-ups, state the changes that should be made to the experiment. [2]

The volume of blood supplied per minute to different parts of the human body changes during two activities, resting and exercising. [Bar graph: small intestine — resting bar tall, exercising bar very short; muscles — resting bar short, exercising bar very tall. Key: black = resting, grey = exercising.] (a) Identify the body system responsible for the changes in the volume of blood supplied per minute while exercising. [1] (b) Describe how oxygen in the environment reaches the muscles. [2] (c) Using the results from the graph, explain how running after a meal affects the absorption of digested food in the small intestine. [1]

Raju set up the following experiment in a dark room. He added a spoonful of substance W into the water and placed a lamp 10 cm away from the water plant. For every two minutes interval, he counted the number of bubbles produced per minute for a duration. He repeated the experiment using two and three spoonfuls of substance W and recorded his results in the table. [Table: Time (min) — 1 spoonful — 2 spoonfuls — 3 spoonfuls. 2 — 3 — 4 — 5; 4 — 6 — 8 — 10; 6 — 9 — 12 — 15; 8 — 12 — 16 — 20.] (a) Name the gas present in the bubbles. [1] (b) Based on the information, what can you conclude about the effect of substance W on the rate of photosynthesis? [1] (c) Suggest a control set-up to show that the increase in the number of bubbles produced per minute was caused by substance W. [1] (d) Suggest one observation that Raju would make when he repeated the experiment with the lamp placed 20 cm away from the water plant. [1]

Study the information about organisms M, N, O and P. (a) Draw a food web to show the food relationship among organisms M, N, O and P. [1] The graph shows the amount of dissolved oxygen and carbon dioxide in water samples obtained from three locations, X, Y and Z, along a river. A nearby farm has been throwing rotting vegetable waste into the river. [Bar graph: location X — high oxygen, very low carbon dioxide; Y — moderate oxygen, similar carbon dioxide; Z — high-moderate oxygen, moderate carbon dioxide.] (b) Based on the information, arrange the water samples from locations X, Y and Z in order of increasing number of decomposers. Fill in the boxes with the letters, X, Y and Z. [1] (c) A larger population of small fish is observed in the part of the river with more submerged plants during the day. Give a reason. [1]

Animal G has an upward-facing mouth and feeds on animal J found on the low-hanging branches of plants growing around the river. Once it spots animal J, animal G shoots a stream of water from its mouth, causing animal J to fall into the water. The diagram shows a cross-section of a river where animal G can be found. [Diagram: river cross-section with part X (shallow water near surface, low-hanging plants) and part Y (deeper water).] (a) Based on the information, in which part of the river, X or Y, is animal G more likely to be found? Give a reason. [1] (b) The top of animal G appears green in colour, helping it to blend in with the shadows from overhanging plants above the water. When animal G swims, it moves gently so that the water surface stays mostly still. State two advantages of these adaptations in ensuring the survival of animal G. [2] (c) Another animal, F, lives at the bottom of the pond in part Y and feeds mainly on worms and tadpoles. Will a sudden increase in the population of animal F affect animal G? Explain your answer. [1] (d) State one way in which animals G and F benefit the plants in the river. [1]

(a) State what fertilisation is. [1] Organism Z is commonly found on the flowers of plant P. The table shows characteristics of both plant P and organism Z. (b) Describe how organism Z helps to pollinate the flowers of plant P. [1] (c) Based on the information, state the dispersal method of the fruits of plant P and explain how its seeds are dispersed. [1]

Study the diagram. (a) State two properties of the material of part F that enable it to provide protection from the sun. [2] (i) Property 1 (ii) Property 2 An experimental set-up was used to compare four materials, P, Q, R and S. The mass of each material was measured at the start before being submerged in water for 12 hours. Each material was removed from the water and its mass was measured again. The increase in mass was calculated and recorded as shown. [Bar graph: P — tallest bar; Q — no/very low bar; R — short bar; S — medium bar.] (b) Based on the results, which material, P, Q, R or S is most suitable to make part F? Give a reason. [1]

Edison designed a circuit to show that the toilet is occupied when the door is locked as shown. He decided to add another indicator light in case the first bulb fused. (a) Complete the circuit diagram to show how the two indicator lights should be connected for them to light up. [2] (b) State a disadvantage of having bulbs connected in the way you have drawn. [1] (c) When installing the circuit, Edison noticed that some toilet doors had latch locks made of plastic. Would the bulbs still light up when the door is locked? Explain why. [1]

Gabriel boiled a beaker of water and observed substances X and Y being formed. He moved the netting of object A through substance X several times and noticed that some substance Y became trapped in between the netting of object A. (a) Identify the state of X and Y. [1] (b) Explain how substance X was formed. [2] People living near mountainous areas can obtain more water by building net panels and water pipes high up in the mountains, where it is mostly cloudy. [Diagram: mountain with net panels near thick clouds, water pipes leading down to a small town. Close-up view of a net panel — net, container, water pipe.] (c) Without using any electricity or changing the size and number of net panels, state one change you can make to the net panel to collect more water from the clouds. [1]

Devi prepared two similar set-ups, P and Q. Each bottle was filled with a different substance, air and sand, before being placed on hot plates set to the same temperature. After ten minutes, she recorded the results as shown. [Table: Set-up P — start 28°C, after 10 min 37°C. Set-up Q — start 28°C, after 10 min 52°C.] (a) Based on the results, what can Devi conclude about how the temperature of the substance changes with time in set-up P as compared to that in set-up Q? Explain your answer. [2] Devi's uncle owns a shop that sells and delivers live fish to his customers. He must make sure that the water in the bag is kept at a constant temperature of 25°C to ensure that the fish survive during delivery. The surrounding temperature is 35°C. [Diagram: water bag with fish at 25°C surrounded by bags X.] (b) Based on the information, which substance, air or sand, should be used to fill bags X? Explain your answer. [1]

Wenxin conducted an experiment using the set-up shown. When the handle was pulled, part P was drawn back, compressing the 9-cm spring to 4 cm. When the handle was released, part P sprang forward and struck block X, pushing it across the table. Wenxin measured the distance the block travelled after the handle was released. (a) State the force(s) acting on block X as it travelled across the table. [1] Wenxin then repeated the experiment with blocks Y and Z. Her results are as shown. [Table: X — area 120 cm², mass 50g, distance 10 cm. Y — area 120 cm², mass 70g, distance 7 cm. Z — area 150 cm², mass 50g, distance 10 cm.] (b) Based on the results, identify the factor that affected the distance travelled by the block across the table. [1] (c) Explain your answer in (b). [2] The spring in the set-up broke so Wenxin decided to replace it. She found two 9-cm springs, C and D. To compare them, she placed identical 400-g masses on the springs as shown. [Diagram: spring C uncompressed 9 cm; spring C with 400g mass compresses to 3 cm. Spring D uncompressed 9 cm; spring D with 400g mass compresses to 5 cm.] (d) Based on the information, which spring, C or D, should Wenxin use to make the blocks travel a greater distance across the table? Explain your answer in terms of forces. [1]

The diagram shows a person walking along a street lined with specially designed tiles. When he steps on a tile, a small generator inside it is activated. The generator produces electrical energy which goes into a battery. At night, the energy from the battery is used to power street lamps. (a) Fill in the boxes with the main forms of energy when a person steps on one of the tiles. [1] [Diagram: box 1 (person stepping on tile) → 'electrical energy' (generator) → box 3 (battery).] (b) Explain, in terms of energy conversion, how the amount of energy in the battery changes as more people walk on the street. [1] (c) Suggest how using these specially designed tiles to light up street lamps at night benefit the environment. [1]