This P6 Science SA1 paper from Ai Tong (2021) covers plants, the human body, cells and systems, electrical systems, animals and life cycles and materials across 40 questions worth 70 marks. Practise Science the way it's tested at P6 level in Singapore, with step-by-step answers on LearnBuddy.
David made the following statements about bacteria in his journal. A It is not always harmful. B It reproduces by spores. C It can make its own food. D It can break down animal waste. Which of the following statements are not correct?
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The bar graph shows the number of days each stage of the life cycles of insects X and Y lasts. Which of the following shows the stage insects X and Y would be at on the 16th day after the eggs were laid?
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Xiao Ming fell and cut his knee. Which of the statements are correct? A His injured knee will have less skin cells than before. B His knee has a fixed shape as the cells have cell walls. C The skin cells on his knee will grow larger to heal the wound. D His skin cells undergo cell division to replace damaged cells.
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The diagram shows organism Q. It collects nuts and buries them in different locations. However, many nuts are not taken away by Q. Which of the following best explains how organism Q's action help in the reproduction of nuts?
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Three plants, K, L and M were planted on a piece of land as shown in Diagram 1. Diagram 2 shows the distributions of plants K, L and M in the same piece of land a few years later. Based on the above diagrams, which of the following characteristics are correctly matched to the fruits of Plants K, L and M and the direction of water flow in the river?
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Peter placed a water plant in a beaker filled with water as shown in the diagram. He placed 5 sheets of paper in front of the lamp and switched it on.. He counted the number of bubbles produced by the water plant for 2 minules. Peter repeated the experiment using 3 sheets of paper and then 1 sheet of paper. Which of the following is the most suitable aim for the above experiment?
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Diagram 1 below shows parts of the human digestive system. The graph below shows the amount of undigested food in samples P, Q, R and S oblained from different parts of the human digestive system. Which of the following correctly matches the parts C, D, E and F in Diagram 1 to the samples P, Q, R and S in the graph?
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Farmer Ben counted the number of organisms living in his garden and plotted the bar graph as shown. Based on the bar graph, which of the following is correct?
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Four organisms, A, B, C and D, found in the same habitat have been classified into the flowchart as shown. Which of the following food webs show the correct food relationships of the four organisms?
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The diagram shows an organism that lives in the cold mountains. In winter, it does not hibemate and will soak in hot springs. Based on the information above, which of the following is an adaptation that helps the organism to survive in its habitat?
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Three children made the following observations about two substances, X and Y. David: The two substances are in the same state at 87°C. Evelyn: Substance X is a liquid at 25°C. Fatimah: Substance Y is a solid at 20 °C. Which of the following shows the possible freezing point and boiling point of the two substances?
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Sue set up an experiment as shown. She placed a 10kg weight on material P until it breaks. She repeated the experiment with different materials, Q, R and S, of the same size and thickness. The table below shows the number of weights each material could hold before breaking. Which of the following statement that Sue made is correct?
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A block of ice was placed in a pot as shown in the diagram below. The pot was then left on the kitchen table. What would happen to the temperature of the melting ice, the water and the air in the pot after some time?
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Sam observed some fog forming on the windscreen inside his car. Which of the following most likely explain(s) Sam's observation? A The windscreen gains heat from outside the car. B The windscreen inside his car is cooler than the air inside his car. C Fog loses heat to the windscreen and condenses into water droplets. D Water vapour outside the car loses heat and condenses on the windscreen.
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A magnet was marked out with letters W, X, Y and Z before it was cut to form two smaller magnets. After the magnet was cut, the pieces were placed at the same distance from a tray of pins. Which of the following shows the possible number of pins attracted at positions W, X, Y and Z?
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Max used a remote control to move a helicopter. He observed the shadow cast on the floor. Which of the following graphs show the length of the shadow cast on the floor as the helicopter moved from point B to C and then to A?
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Four circuits are set up as shown. W, X, Y and Z represent four different materials. Based on the circuits, which of the following materials, W, X, Y or Z, is definitely a non-conductor of electricity?
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The diagram shows a circuit tester and the top view of a circuit card with six paper clips, P, Q, R, S, T and U. The paper clips are connected using wires on the underside of the circuit card. When Jacob connected the circuit tester to various paper clips, he obtained the following results. Which of the following connections is not possible on the underside of the circuit card?
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Rita set-up an experiment find out how the length of the spring is affected by the mass hung on it. What could Rita do to improve the accuracy of her experiment?
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An experiment was set up as shown. When water drips out from the stem of the funnel, the waterwheel will spin. Which of the following will definitely make the waterwheel spin faster? A Use a heavier waterwheel. B Shift the funnel to a higher position. C Shift the waterwheel to a higher position. D Use a funnel with a wider opening at the stem.
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The diagram shows a cell of plant G. (a) Label 'cell membrane' in the diagram above. [1] Plant G contains a red pigment in its cells that cannot pass through its cell membrane. (b) Would the young of plant G also contain red pigment? Give a reason for your answer. [1] Sam conducted an experiment on plant G. He crushed plant G and placed two pieces of them into a beaker of water for several hours. He then observed that even though water has tumed red, the pieces of plant G were still red. (c) Explain why the water tumed red. [1]
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The diagram shows the different stages of growth in plant W. (a) Arrange the above stages, A, B, C and D, in the correct order. [1] Some the the leaves of the plant wilted and fell to the ground. However they were not removed. (b) Explain how the dead leaves will benefit the plant. [1] Mary thinks that the colour of flowers would affect the number of bees that visited the flowers. (c) Which two types of flowers, K, L, M and N. did she use to arrive at this conclusion? Explain your answer. [2]
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Plant D can be found in a desert. The flowers of plant D grow on the top of the stem and give off a strong scent. (a) Explain how having flowers on the top of the stem benefits plant D. [1] The statements below describe the behaviours of organism G. G eats fruit of D but cannot digest its seeds. G also digs holes in plant D to make a nest done without damaging plant D. G lays eggs in plant D. (b) State a characteristic of G such that it can be identified as a bird. [1] (c) Explain how G benefits the survival of plant D. [1] (d) Explain why it is an advantage for G to build a nest in plant D. [1]
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Tiny openings are found on a leaf. State the function of the tiny openings. [1] In seawater with high levels of carbon dioxide, organism S grows poorly. Fisherman Ben tied Plant K next to a cage of organism S as shown below. (b) Explain how plant K helps organism S to grow better in seawater with high levels of carbon dioxide. [2] Fisherman Ben carries an air tank so that he can breathe when he goes underwater to check on organism S. (c) Name the body system that allow Fisherman Ben to breathe. [1] (d) Explain why Fisherman Ben will not be able to breathe underwater without the air tank. [1]
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The graph below shows how the population of animals X, Y and Z changed over a period of 10 years in a particular habitat. (a) Using the information, identify which animal is the prey and which animal is the predator. Prey: ____ Predator: ____ [1] (b) Explain your answer in part (a). [1] The food chain below is found in an aquatic habitat. algae → A → B Due to changes in weather, the algae grew extremely rapidly in the waters. This caused a sharp decrease in population size of organisms A and B. (c) Explain why a rapid increase in algae led to the sharp decrease in population size of organisms A and B. [1]
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Xiaomei found a dented ping pong ball. Good, there are no cracks. I can make it round again. (a) Describe what Xiaomei can do so that the ping pong ball can return to its original shape. Explain how the method will work. [2] (b) Compare the mass of the ping pong ball before and after returning to its original shape. Give a reason for your answer. [1]
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An engineer constructed an electrical circuit which acts as a warning system to detect flooding as shown. Part A of the system is placed in a sheltered area. When it is raining, rainwater is collected in the open drain which is linked to a container. (a) The support should be made with a material that is waterproof. Suggest another property of the material used to make the support. [1] (b) Explain how the alarm is turned on when it rains heavily. [2] (c) The engineer added a light bulb to the warning system and the alarm rang as loudly as before. Draw wires to complete the electrical circuit below. [1]
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Judy carried out the experiment as shown. She switched on a torch and placed it in a long cardboard tube. She adjusted the position of the torch in the cardboard tube with a stick. She then recorded the amount of light detected by the light sensor when she moved the torch away from it. The graph below shows her results. (a) State the relationship between the amount of light detected by the light sensor and distance D. [1] Judy placed the same torch in a similar cardboard tube as shown. There was a hole in the tube and a coin was placed directly below it. Judy switched on the torch, but could not see the coin when she looked through the hole. (b) Based on her graph, explain why Judy could not see the coin. [2] Judy placed the same torch in another similar cardboard tube as shown. She switched on the torch and this time, she was able to see the coin in the pipe through the hole. (c) Draw light rays in the diagram belaw to show how Judy was able to see the coin. [1]
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Mr Lee served a drink in a cup with object Q in its base. When the cup is placed above object P, it floats as shown. (a) Explain his observation. [2] The table shows how the amount of water added to the cup affects the distance between the cup and object P. Amount of water (cm³): 0, 100, 200. Distance between the cup and object P (cm): 5, 3, 1. (b) What is the distance between the cup and object P when 300cm³ of water is poured into it? Explain your answer in terms of forces. [2] (c) What could Mr Lee do to ensure he gets reliable results? [1]
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James placed an empty bottle with two holes al points X and Y into a tank of water as shown. (a) Give a reason why the bottle sank after awhile. [1] James put objects of the same size, J and K, into a tank of water. He observed that both objects sink in water as shown. (b) Can James conclude that objects J and K were made of the same material? Give a reason for your answer. [1]
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The diagram below shows the water cycle. (a) Name the states of water at A and B. A:____ B:____ [1] (b) State a similarity between boiling and evaporation. [1] Mary baked a cake and took the cake tin out from a hot oven. She overturned the cake tin as shown Diagram 1. She then placed a wet towel on the overturned cake tin as shown Diagram 2. (c) Explain how placing a wet cloth over the cake tin would allow the cake to cool down faster. [2]
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Siti played a game at the funfair as shown below where she will need to release the block at the top of the ramp. Siti will win a prize if the marble hits the buzzer and makes a sound. (a) Fill in the boxes below to show the energy changes that cause the buzzer to sound. [1] (b) Which block should Siti use to increase her chances of winning a prize? Explain your answer in terms of energy changes. [2]
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