This P6 Science SA1 paper from Raffles Girls (2017) covers plants, materials, the human body, electrical systems, heat and temperature and light and shadows across 41 questions worth 104 marks. Practise Science the way it's tested at P6 level in Singapore, with step-by-step answers on LearnBuddy.
Organisms W, X, Y and Z are classified using the chart below. Which organism is most likely a fungi?
Q2MCQ2 marks
Which of the following characteristic(s) can be used to differentiate between fish and reptile?
A Method of breathing
B Type of body covering
C Method of reproduction
Q3MCQ2 marks🖼 Visual
Mary classified a group of animals in the table as shown below. Group A: Cockroach, Grasshopper, Chicken. Group B: Butterfly, Mosquito, Beetle. What characteristic of the animals was used by Mary in her classification?
Q4MCQ2 marks🖼 Visual
Helen prepared four set-ups, P, Q, R and S, as shown in the table below. Helen selected the following set-ups for each of the following experiment. Which of the following set-ups used will ensure a fair test?
A Q and R — To find out if water is needed for germination
B P and S — To find out if the presence of warmth affects germination
C P and Q — To find out if the number of seeds affects the rate of germination
D R and S — To find out if the amount of water and presence of warmth affects germination
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The diagram below shows Siti's family tree. Some of Siti's family members have attached earlobes while some have detached earlobes. Which one of the following statements is correct?
Q6MCQ2 marks🖼 Visual
The diagram below shows the cross-section of a flower. Which parts of the flower show where the pollen grains and ovules are produced?
Q7MCQ2 marks🖼 Visual
The diagram below shows parts of the digestive and circulatory system of a human. Which of the following statement(s) about the system(s) above is/are correct?
A Blood transports the undigested food from P to the large intestine.
B Digested food from Q enters the blood vessels and is transported to different parts of the body.
C The circulatory system transports carbon dioxide away from the different parts of the body.
Q8MCQ2 marks🖼 Visual
Xiao Hui removed the outer ring of the stem of a plant bearing white flowers at X as shown in the diagram below. She left the plant under the Sun and watered it regularly with water stained with red food colouring. After a few days, Xiao Hui observed that the white flowers and flower buds were withering. However, the part of plant below part X was still alive and was observed to be swollen as shown in the diagram above. She also noticed that the leaves and stem below part X turned red, but not the part of the plant above part X. Which of the following statement(s) explain(s) her observations?
A The food-carrying tubes were removed at X.
B The water-carrying tubes were removed at X.
C The food made by the leaves was accumulated at the swollen part of the stem.
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The diagram below shows a cell with its parts labelled A, B, C and D. Which one of the following correctly describes the functions of parts A, B, C and D of the cell?
Q10MCQ2 marks🖼 Visual
The diagram below shows the direction flow of blood in a fish and flow of substances in a plant. Which of the statements about flow of blood in fish and substances in plant are correct?
A The plant removes water through the leaves and absorb water through the roots.
B The plant allows food and water to flow at the same time in different directions
C The flow of the blood in a fish and the flow of water in a plant moves in a circulatory direction.
D Oxygen enters the blood vessels through the gills and carbon dioxide in the blood leaves the blood vessels through the gills.
Q11MCQ2 marks🖼 Visual
Amy prepared four set-ups by putting identical amount of soil samples, A, B, C and D into each funnel as shown below. Amy poured 100 ml of water into the funnel of each set-up and recorded the amount of water collected in the measuring cylinders after two minutes in the table below. Amount of water collected: A = 60 ml, B = 20 ml, C = 95 ml, D = 80 ml. Which one of the following soil samples, A, B, C or D, is able to hold the greatest amount of water?
Q12MCQ2 marks🖼 Visual
Lillian conducted an experiment to investigate the effect of the amount of light on the growth of plant K over a period of time. She recorded her findings in the graph below. Next she also conducted another experiment on the effect of temperature of the surrounding air on the growth of Plant K over a period of time. The graph below shows the results of her experiment. Based on the results above, which one of the following statements is definitely correct?
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Mavis carried out an experiment to study the decomposition of dead leaves. She placed some dried leaves in container as shown below and placed it in a cupboard. After 2 weeks, she noticed that no decomposition had taken place. What change(s) should she make to the set-up so as to speed up the rate of decomposition?
A Add some water.
B Remove the lid.
C Add some caterpillars
D Add more dead leaves
Q14MCQ2 marks🖼 Visual
The table below shows the description of some physical factors in four different habitats. Organisms Y prefer dark and damp places. They are most active when the surrounding temperature ranges from 20°C to 25°C. Which of the following habitat(s) will most organism Y be found?
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Fiona and her classmates counted the number of plants and animals found in a certain part of their school and recorded their findings in the graph shown below. Based on the information above, which one of the following statements is/are definitely true?
A The population of butterfly is the smallest.
B The total number of populations in the habitat is 240.
C The total number of populations in the habitat may be more than five.
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Gary prepared two identical set-ups, X and Y, and placed them in the dark enclosed boxes for three days as shown in the diagrams below. Only the lamp in set-up X was switched on over the three days. Which one of the following graphs shows the change in the amount of oxygen in the set-ups X and Y over the three days?
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Material X is used to make the tyres of the truck as it will not break easily when the tyres roll over stones. It is able to wrap around the rims of the wheels. When it rains, water does not get into the tyres. Based on the information above, which of the following are the properties of material X taken into consideration when used to make the tyres?
A strong
B flexible
C waterproof
D able to float on water
Q18MCQ2 marks🖼 Visual
Two syringes, X and Y, contained substances A and B respectively. Plunger in syringe X could not be pushed in while plunger in syringe Y could be pushed in slightly as shown in the diagram below. Which of the following statement(s) explain(s) the observations?
A Substance A has definite volume.
B Both substance A and B have mass.
C Substance B can be compressed but not A.
Q19MCQ2 marks🖼 Visual
The table below shows the states of four substances, P, Q, R and S, at different temperatures. Which of the following statement(s) is/are correct?
A The boiling point of substance R is 40°C.
B The melting point of substance Q is 40°C.
C Substance P has the highest melting point.
D Substance S has a boiling point less than 10°C.
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Study the four circuits W, X, Y and Z shown below. The bulbs and batteries in the circuits are identical and all the bulbs lit up. Which one of the following statements about the brightness of the bulbs is correct?
Q21MCQ2 marks🖼 Visual
Ahmad had three materials, X, Y and Z. He placed them in positions, A, B and C, of the circuit shown below. The results of the experiment were shown in the table below. When any of the lamps, L1, L2, L3, L4 or L5, lit up during the experiment, a tick (√) was placed in the box. (Original result: X at A, Y at B, Z at C → L1√, L2√, L3√, L4√, L5 blank.) Which of the following would show the correct result if the materials, X, Y and Z, were placed at different positions?
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The set-up below shows four rings, A, B, C and D, which pass through a plastic rod. Which one of the following identifies A, B, C and D correctly?
Q23MCQ2 marks🖼 Visual
The canopies of parachutes, A, B and C were made of the same material but different sizes as shown below (A smallest, C largest). A 1-kg weight was tied to each parachute. The three parachutes were dropped at different heights above ground. The parachutes were observed to reach the ground at the same time. Which one of the following could possibly be the heights where parachutes A, B and C were dropped?
Q24MCQ2 marks🖼 Visual
Tom and his friends want to play a game of carrom. In the game, the carrom coins need to move over long distance on the carrom board easily. Which of the following should they do before playing the game so that the coins will move a longer distance on the board?
Q25MCQ2 marks🖼 Visual
Mabel carried out an experiment in a dark room with the set-up as shown below. She arranged 4 sheets of the same size but of different materials K, L, M and N in a straight line. Circles of different sizes were cut out from sheet K and sheet L as shown in the diagrams below (K has a large circular hole, L has a small circular hole). When the torch was switched on, she only observed a bright circular patch of light on sheet M. Which one of the following is definitely true about the degree of transparency of the sheets used above?
Q26MCQ2 marks🖼 Visual
Wilson carried out an experiment using set-ups, A and B as shown below. The materials used in the set-ups were identical. The iron bars were positioned differently as shown below. The iron bars attached firmly to a wooden support in both set-ups were heated for twenty minutes over high heat. Which one of the following shows the correct explanations for his observations after twenty minutes?
Q27MCQ2 marks🖼 Visual
Jason, Timothy and Audrey were given the same amount of hot tea of the same temperature at the same time. Jason and Timothy poured their hot tea into a porcelain cup and saucer respectively and left them on the table for one minute before drinking the tea. While Audrey poured the hot tea between two identical porcelain cups repeatedly for one minute before drinking it as shown below. Based on the information above, which one of the following statements is correct?
Q28MCQ2 marks🖼 Visual
Hannah designed a doorbell as shown below. She attached the steel rod to a support so that the rod can swing freely. When the circuit is closed, she observed that the steel rod swing and hit the bell. Which one of the following correctly describes the main energy conversion for the above observation?
Q29Structured4 marks🖼 Visual
Francis counted the number of wild plants P, Q and R on an island. After a few months, he noted down his observations in the diagrams shown below. (a) Based on the information above, state the method of seed dispersal for plants P, Q and R. (i) P: ____ (ii) Q: ____ (iii) R: ____ (b) Based on the observation above, give a reason for your answer in (a)(i). (c) State one physical characteristic that plant P is likely to have that helps it in its seed dispersal.
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The diagram below shows the movement of substances in a plant. (a)(i) Identify tubes P and Q in the stem of the plant. P: ____ Q: ____ (b)(ii) Identify substances X and Y. X: ____ Y: ____
The diagram shows the flow of blood in a human body (lungs–heart–other parts of the body, with A between lungs and heart, B between heart and other parts of the body). (c) What is the difference between the composition of oxygen and carbon dioxide in the blood flowing at A and B?
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Study the food web of some organisms in a habitat below. (a) Based on the food web above, use letters, A, B, C, D, E or F, to identify the following: food producer(s): ____ ; Predator(s) only: ____ (b) Based on the food web above, when there is a sharp increase in the population B, the number of C and E remained the same. How would the population of A and D change? Give a reason for your answer. (i) Effect of population A and reason: ____ (ii) Effect of population D and reason: ____
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A farmer's crops had been destroyed by aphids. He wanted to find out which types of ladybirds, X, Y, Z, is most effective in getting rid of the aphids in his plantation. He prepared the set-ups by placing 20 ladybirds and 200 aphids in each container. At the end of the experiment, the farmer recorded the number of aphids left in each set-up (Ladybird X: 200→194; Ladybird Y: 200→107; Ladybird Z: 200→48). (a) Based on the results of his experiment, which type of ladybirds, X, Y or Z, should he use to get rid of the aphids most effectively? Give a reason for your answer. (b) The graph below shows the change in population size of the plants, aphids and ladybirds after the introduction of the ladybirds into the farmer's plantation over a period of time. There were no other organisms in this habitat. Label the lines correctly using the words, 'plants', 'aphid' and 'ladybird' to show the change in population size over time. (i) ____ (ii) ____ (iii) ____
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Dina prepared the following set-up and placed it in a dark room as shown below. The water in the experiment was added with liquid X. Liquid X changes colour according to the concentration of carbon dioxide as shown in the table (Less than normal CO2 → purple; normal → red; Higher than normal → yellow). She observed the amount of gas collected in the test tube over three days and the change in the colour of water with liquid X and recorded her observations (Day 0: 0 cm³, yellow; After 1 day: 3 cm³, red; After 2 days: 5 cm³, purple; After 3 days: 6 cm³, purple). (a) Name the gas collected in the test tube. (b) Explain her observations made over the three days. (c) State the relationship between the amount of carbon dioxide present and the amount of gas produced by the plant.
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The diagram below shows a water collecting device found in countries with little rainfall. The device was left in the open throughout the night. In the morning, tiny droplets of water were found on the mesh. There was no rain throughout the night. (a) Explain how the water droplets were formed on the mesh. (b)(i) In order to increase the amount of water collected, what can be done to the above set-up without changing the type of materials used in the device? (ii) Give a reason for your answer in (b)(i).
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The wiring in Lynn's house was arranged as shown below (a series circuit with a battery, refrigerator, garden light, living room lights and kitchen light all in one loop). When the garden light was faulty and Lynn turned it on, she observed that the refrigerator and all the other lights would not work. (a) How should Lynn arrange the wiring in her house such that if one bulb is not working, the refrigerator and other bulbs would still work? Draw the electrical circuit diagram in the box below.
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Jenny attached two bars on top of each toy car. She placed the toy cars 5 cm apart from each other as shown in the diagram below. She noticed that the toy cars moved away from each other and ended up 10 cm apart from each other. (a) Based on the above observations, what could she conclude about the two bars placed on top of the toy cars? Give a reason for your answer. (b) Without changing any objects used in the experiment, suggest what Jenny could do such that the toy cars could move from their original positions and ended up more than 10 cm apart from each other.
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Tom released a ball from the top of a ramp. He noticed that the ball rolled down the ramp, across the floor and stopped some distance from the ramp as shown in the diagram below. Tom measured the distance of the ball from the ramp and repeated the experiment but changed the surface of the ramp using different materials (Material A: ball stopped 20 cm from ramp; Material B: ball stopped 15 cm from ramp). (a) Explain the difference in the distance travelled by the ball on the ramp made of different materials. (b) What can Tom do so that the ball moving on ramp with surface B could travel a longer distance without replacing any items from the set-up. Give a reason for your answer.
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Siti conducted an experiment on springs A and B. She hung various loads one at a time and recorded the length of the spring. Her results are shown in the graph below. (a) Name the force(s) that acted on the loads in this experiment. (b) Which spring, A or B, is more elastic? Give a reason for your answer. (c) After Ali hung 100 g of load on spring A, he removed all the loads and observed that spring A was 20 cm long. Give a reason for his observation.
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Mabel used two wooden objects, A and B, below in her experiment (Object A: a thin rectangular strip 10 cm tall; Object B: a square frame 10 cm × 10 cm with a square hole in the middle). She hung the two wooden objects at different distances from the lighted torch as shown below (object A at 15 cm from the torch, object B further behind A, then a screen behind both). (a) In the box below draw the shadow of the objects Mabel would observe on the screen. (b) Explain how you arrive at your answer in (a). (c) Mabel moved the torch nearer to objects A and B (now object A at 10 cm from the torch). What change would she observe in the shadows formed on the screen?
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Sam heated three identical glass flasks containing 200 ml of water on materials X, Y, Z. He placed the three materials, X, Y and Z on the heater and positioned the three glass flasks containing 200 ml of water on each of the materials as shown below. (a) List two variables Sam must keep the same, in order to conduct a fair test. (b) After making the changes to ensure his experiment was a fair test, Sam recorded the time taken for the water to boil as shown below (Material X: 4 min; Material Y: 15 min; Material Z: 8 min). Based on Sam's results, which material, X, Y or Z would you use to make an ice box? Give a reason for your answer.
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Johnson set up the ramp below using five identical blocks (a plank rests as an incline between a stack of two blocks on the left and a stack of three blocks on the right, with a ball at the top of the incline on the right stack). Johnson released the ball down the ramp. The time taken for the ball to roll down the ramp is approximately four seconds. (a) Johnson wanted to rearrange the five blocks such that the ball will roll down the ramp in less than four seconds. Draw the new set-up using all the objects provided in the box below. (b) Explain your answer in (a). (c) Describe what Johnson has to do to ensure that the data collected is reliable?
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