P6 Science SA2 2018 — Raffles Girls | Singapore Past Year Paper

Q: The diagrams below show two plants (Bird's Nest Fern and Papaya Plant). Which one of the following similarities and differences between the two organisms are correct?

2. Similarity: Both make their own food. Difference: Bird's nest fern reproduces by seeds but a papaya plant reproduces by spores.. Both ferns and papaya plants contain chlorophyll and make their own food by photosynthesis (correct similarity). The valid difference is that ferns are non-flowering and reproduce by spores while papaya is a flowering plant that reproduces by seeds. Option 3's 'get energy directly from the Sun' is wrong (plants make food, not get energy directly), so option 2 is the only fully correct row.

Q: Study the flowchart below. Which one of the following represents questions A, B and C correctly?

4. A: Does it have gills? B: Does it have six legs? C: Does it have hair?. Animals with scales split into Shark (Yes to A) and Lizard (No). Shark vs lizard is distinguished by 'Does it have gills?' (shark yes). Without scales, Beetle (Yes to B) is separated by 'Does it have six legs?' (insect). The remaining split Bat (Yes to C) vs Chicken is distinguished by 'Does it have hair?' (mammal yes). This matches option 4.

Q1 MCQ 2 marks 🖼 Visual

The diagrams below show two plants (Bird's Nest Fern and Papaya Plant). Which one of the following similarities and differences between the two organisms are correct?

Q2 MCQ 2 marks 🖼 Visual

Study the flowchart below. Which one of the following represents questions A, B and C correctly?

Q3 MCQ 2 marks 🖼 Visual

The bar graph below shows the average amount of food taken in by organism X per day at each stage of its life cycle. Which one of the following matches P, Q, R and S to the correct stages of the life cycle of organism X?

Q4 MCQ 2 marks 🖼 Visual

The diagram below shows the life cycle of a flowering plant (seed → seedling → adult plant, with stages marked X, Y and Z). Which of the following statements is correct?

Q5 MCQ 2 marks 🖼 Visual

The diagrams below show a human reproductive system and a plant reproductive system. Which one of the following statements is correct about the human and plant reproductive system?

Q6 MCQ 2 marks 🖼 Visual

The diagrams below show two flowers, A and B, from the same plant. Which one of the following shows how pollen grains are transferred during pollination?

Q7 MCQ 2 marks 🖼 Visual

The diagram below shows the human digestive system. Which one of the following takes place at part A?

Q8 MCQ 2 marks 🖼 Visual

Bala removed a ring of a stem from a plant as shown in the diagram below. He left the plant under well-lit condition and watered it regularly. He observed a 'swelling' just above the cut portion of the stem a few days later, as shown in the diagram below. Which of the following statement(s) is/are correct? A: Water can be transported to all parts of the plants. B: The food-carrying tubes were removed from the cut part of the stem. C: The water-carrying tubes were removed from the cut part of the stem. D: Food cannot be transported to the parts below the cut part of the stem.

Q9 MCQ 2 marks 🖼 Visual

The diagrams below show two cells (Cell X and Cell Y). Which one of the following statements about Cells X and Y is correct?

Q10 MCQ 2 marks 🖼 Visual

Sea turtle hatchlings must crawl their way to the sea as soon as they have been hatched. They find their way to the sea by sensing light reflected off the sea from the stars. However, artificial light can distract them and make them move away from the sea. The diagrams below show different types of street lamps A, B, C and D, at car parks near the nesting sites of sea turtles at night. Which one of the above street lamps is most suitable to be erected at carparks near to the nesting sites of sea turtles so that the sea turtles hatchlings will not be distracted from crawling towards the sea?

Q11 MCQ 2 marks 🖼 Visual

Corn of the same variety was planted in farms P and Q. Farms P and Q were of the same size but have different types of soil. Each farm is divided into two equal plots of the same size. After a few months, the corn was harvested and the result is recorded in the graph below. Based on the information above, which of the following statements below are correct? A: The soil in Farm P is more suitable for growing corn than the soil in Farm Q. B: The soil in Farm Q is more suitable for growing corn than the soil in Farm P. C: Presence of fertilizer has no effect on number of corn harvested in Farm P and Farm Q. D: Presence of fertilizer has an effect on number of corn harvested in Farm P but not in Farm Q.

Q12 MCQ 2 marks 🖼 Visual

Study the food web below. Which one of the following statements is correct?

Q13 MCQ 2 marks 🖼 Visual

Study the food web below. Which one of the following would result in a decrease in the number of animal W?

Q14 MCQ 2 marks 🖼 Visual

Kate studied the effect of temperature on the life cycle of organism P. She recorded her results in the table below. Which of the following statement(s) about organism P is/are definitely true? A: Organism P survives the best at 15 °C. B: The egg of organism P takes a shorter time to hatch at 30 °C than at 25 °C. C: The duration of the life cycle of organism P decreases as temperature increases until 35 °C.

Q15 MCQ 2 marks 🖼 Visual

The graph below shows the amount of carbon dioxide released into the air when different types of fossil fuels were burned. Which one of the following fossil fuels will contribute the least to global warming?

Q16 MCQ 2 marks 🖼 Visual

Bala set up the apparatus below to investigate the factors affecting the rate of photosynthesis. What can Bala do to make the ink drop move to the right? A: Add more water plants in the test tube. B: Move the lamp closer to the water plant. C: Add a solution to the test tube to increase the amount of oxygen in the water.

Q17 MCQ 2 marks 🖼 Visual

The table below shows the properties of four materials, W, X, Y and Z. A tick (✓) indicates the presence of the property. The diagram below shows a child jumping up and down on a trampoline. Which material is most suitable to make part P of the trampoline?

Q18 MCQ 2 marks 🖼 Visual

The table below shows some information about substances P, Q, R and S. A tick (√) indicates the presence of the property. Which one of the following correctly identifies substances P, Q, R and S?

Q19 MCQ 2 marks 🖼 Visual

The diagram below shows an air pump connected to a container. When the plunger is pushed in, 100 cm³ of air is pumped into the container. Which one of the following shows the change in the volume and mass of the air in each container after the plunger is pushed?

Q20 MCQ 2 marks 🖼 Visual

Shirley wrapped two identical beakers of water, E and F, with identical towels as shown below. One of the towels was dry while the other was wet. Shirley left the two set-ups near the window for one hour. She weighed the towels at the beginning and at the end of the experiment. Which of the following observations would she make? A: The volume of water in both beakers E and F will decrease by the same amount. B: The temperature of water in beaker F will be decrease faster than that in beaker E. C: The mass of the wet towel will decrease while the mass of the dry towel will remain the same.

Q21 MCQ 2 marks 🖼 Visual

The diagrams below show four electric circuits which consists of identical electrical components. In which of the following circuits will the bulb light up?

Q22 MCQ 2 marks 🖼 Visual

The diagram below shows an electric circuit. Which of following correctly states the number of bulb(s) that would remain lit when one of the bulbs was fused?

Q23 MCQ 2 marks 🖼 Visual

Sharon set up an electric circuit with four identical bulbs, K, L, M and N. She connected two different materials, Y and Z, to the circuit as shown in the diagram below. She observed that only bulbs K and L light up. Which one of the following correctly identifies materials Y and Z?

Q24 MCQ 2 marks 🖼 Visual

The diagrams below show a parachutist falling from point P to Q and then landing at R. He opened up his parachute just after point P. Which of the following statement(s) is / are correct? A: The parachutist falls at greater speed at P than at Q. B: There is no gravitational force acting on the parachutist at R. C: The parachutist has to overcome more air resistance at Q than at P. D: There is more gravitational force acting on the parachutist at P than at R.

Q25 MCQ 2 marks 🖼 Visual

A man wanted to move a box down a slope. He gave a push to the box at X, but the box only reached point Y. Which of the following actions will allow the box to move a greater distance down the slope? A: Use a slope with a rougher surface. B: Apply oil on the surface of the slope. C: Exert a greater push force on the box. D: Decrease the angle of inclination of the slope.

Q26 MCQ 2 marks 🖼 Visual

The set-up below shows light shining on three shapes A, B and C made of cardboard. They are placed at different distances from the torch. The diagram below shows what was seen on the screen. Which one of the following correctly represents shapes, A, B and C?

Q27 MCQ 2 marks 🖼 Visual

Mala attached some thumbtacks, A, B, C and D, to the underside of an aluminium frame with equal amounts of wax, as shown below. The aluminium frame is in the shape of four squares. She heated point 'X', which is in the middle of the aluminium frame, with a lit candle. Which one of the following shows the correct order in which the thumbtacks would drop off from the aluminium frame?

Q28 MCQ 2 marks 🖼 Visual

Hui En set up the experiment as shown below (a cup with slits hung by string above a candle, on a retort stand). Which of the following actions will allow the cup to spin faster? A: Add more lit candles. B: Shorten the string attached to the cup. C: Replace the candle with a smaller and shorter candle.

Q29 Open-ended 3 marks 🖼 Visual

Susan carried out an experiment to study the preferred environment of organisms M. Thirty similar organisms M were put in the middle of dish X. After ten minutes, the number of organisms M in each section of Dish X was counted. She repeated the experiment with Dish Y. The results are shown in the diagrams below. (a) Based on the above information, state the conditions of the environment that organism M least preferred. [1] (b) Living things need air, food and water to survive. Identify two other characteristics of living things that were demonstrated by organisms M in the experiment. [2] (i) ____ (ii) ____

Q30 Open-ended 3 marks 🖼 Visual

The diagrams below show two fruits, E and F. (a) Describe the difference in the process of seed dispersal between fruits E and F [2]. The diagrams below show how fruit G and H disperse their seeds. (b) State one disadvantage of fruit G's method of seed dispersal compared to fruit H's method of seed dispersal in the presence of wind. [1]

Q31 Open-ended 3 marks 🖼 Visual

Fred coated clear oil on different parts of three similar leaves on the same plant as shown in the table below (Leaf J: Top and bottom surface; Leaf K: Bottom surface; Leaf L: Not covered with oil). Then he wrapped each leaf with a clear plastic bag as shown in the diagram below (leaves labelled X, Y, Z). He placed the plant in the garden from 9 am to 6 pm. He observed that there were most number of water droplets formed on the inner side of bag Z at the end of the experiment. (a) Which leaf, J, K or L was wrapped in bag Z? Explain your answer. [2] (b) Stomata on leaves tend to reduce in size on hot and dry days. Give a reason for this observation. [1]

Q32 Open-ended 4 marks 🖼 Visual

Peter wanted to investigate the effects of surrounding temperature on ants. He exposed identical containers, each containing 50 ants, to different surrounding temperatures. After ten minutes, he recorded his results in the table below. (a) Based on the information above, what is the relationship between the surrounding temperature and number of active ants? [2] Peter conducted another experiment to find out if ants prefer to feed on substance X or substance Y. He recorded the number of ants attracted to substances X and Y in the graph below. Solution P is poisonous to ant. Peter wanted to kill the ants using solution P. He prepared the following set-ups as shown below. A tick (✓) indicates the presence of the substance or solution. (b) Based on all the results of Peter's experiments, in which set-up, E, F, G or H, would Peter observe most dead ants? Explain his observations. [2]

Q33 Open-ended 3 marks 🖼 Visual

The diagram below shows animal X (a beaver-like animal with sharp claws, flat stiff tail and webbed feet). (a) Based on the information above, identify a structural adaptation that enables it to swim well. Explain how it enables animal X to swim well. [1] (b) Animal X spreads oil over its fur to keep its skin dry underwater. Explain how this adaptation helps to keep itself warm when it is out of the water. [2]

Q34 Open-ended 4 marks 🖼 Visual

The diagram below shows two objects, R and S, placed on each side of a balance. Objects R and S are of the same volume and made of the same material. Two identical cups were filled to the same level, L, with objects R and S, as shown below. Cup X could contain less objects than cup Y. (a) Based on the above information, describe one similarity between objects, R and S. [1] (b) Water is poured into each container until level L. Which cup, X or Y, is able to be filled with more water? Explain your answer. [2] (c) If all objects R in cup X are crushed into smaller pieces, would the volume of water to fill up cup X to the level L increase, decrease or remain the same? Give a reason for your answer. [1]

Q35 Open-ended 3 marks 🖼 Visual

Jennie poured same volume of water at different temperatures into three identical cups, X, Y and Z, and left them on a table in the room. After some time, she observed that water droplets were formed on cups X and Y only, as shown below. (a) Arrange the cups, X, Y and Z, in the order of increasing temperature of water that was poured into the cups. [1] (Lowest temperature → Highest temperature) (b) Explain why no water droplets were observed on cup Z. [2]

Q36 Open-ended 3 marks 🖼 Visual

The diagram below shows how bulbs are arranged in a house consisting of four areas, the living room, the kitchen, the bedroom and the bathroom. (a) The bulbs are of the same brightness. Based on the circuit shown above, describe one advantage of this arrangement of bulbs. [1] (b) On the above diagram, mark four crosses 'X' to show the positions of four switches that should be added to the electric circuit such that each bulb can be turned on and off individually. [2]

Q37 Open-ended 3 marks 🖼 Visual

Rachel prepared the set-up as shown in Diagram 1 (a magnet at the top with a ball hanging below it on a retort stand). (a) Identify two forces acting on the ball. [1] Rachel added object X to the set-up. She was able to suspend the ball in between object X and the magnet, as shown in Diagram 2. (b) Based on the information above, name a material that is used to make object X. [1] (c) Objects X and Y are made of the same material. When Rachel replaced object X with object Y, she observed that the distance between the magnet and the ball decreases. Give a reason for her observation. [1]

Q38 Open-ended 6 marks 🖼 Visual

Maya used the set-up below to study three types of springs, X, Y and Z. She placed objects of different masses on each spring and measured the length of the spring. The results are shown in the graph below. (a) In which two springs, X, Y and Z, will the decrease in the length of spring be the same when an object of 7 kg mass is placed on each spring? [1] Maya attached one end of a spring to the bottom of the box. Then she placed a toy on top of the spring and closed the lid. When she opened the lid, the toy jumped as shown in diagrams below. (b) Based on the information on the graph, which spring, X, Y or Z, would Maya use the least force to compress the spring in order to close the lid? Give a reason for your answer. [1] (c) Maya used the spring in your answer in part (b) but changed the box to a taller box. Would the same toy jump to a greater, lower or the same height? Explain your answer in terms of force. The toy would jump to ____ Explanation: ____ [2]

Q39 Open-ended 2 marks 🖼 Visual

The diagram below shows Henry looking through a tube and saw the object on the table. (a) State one property of light that enables Henry see the object. [1] The object was raised by putting it on a box as shown in the diagram below. (b) Would Henry be able to see the raised object? Explain your answer. [1]

Q40 Open-ended 5 marks 🖼 Visual

Jack filled three identical pails, X, Y and Z, with the same amount of water of different temperatures. He dipped his hands into the pails and recorded his observations as shown in the table below (Step 1: Dip left hand in pail X and right hand in pail Y — left hand felt (i) neither warm nor cool, right hand felt (ii) cool. Step 2: Remove both hands and immediately dip both hands into pail Z — left hand felt (iii) warm, right hand felt (iv) ?). (a) Give a reason for Jack's observation in part (i). [1] (b) Predict the observation in step (2) part (iv). Explain your answer clearly. [2] Observation: Compared with his left hand, Jack's right hand would feel ____. Jack placed a piece of ice and a piece of metal gauze at the bottom of a glass tube. He filled the glass tube with tap water and heated the glass tube at the upper end as shown in the diagram below. He observed that the water at the surface boiled after some time but the ice cube took a longer time to melt. (c) Based on Jack's observations, state a property of water. [1] (d) Give a reason why he placed a metal gauze in the test-tube. [1]

Q41 Open-ended 4 marks 🖼 Visual

The diagram below shows a hydroelectric power station. The water turns the blades in the turbine so that electricity is produced by the generator. (a) How does using running water as a source of energy in power stations help to reduce global warming, as compared to the burning of fossil? [1] (b) Fill in the boxes below to show the conversion of energy: ____ energy (at point X of the reservoir) → ____ energy (turbine) → electrical energy (generator). [1] The graph below shows the amount of rainfall at three locations, P, Q and R, over twelve months. (c) Which location, P, Q or R, is most suitable for a hydroelectric power station to be built? Explain for your answer. [2]

P6 Science SA2 2018 — Raffles Girls

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