This P6 Science SA1 paper from Catholic High (2019) covers plants, materials, light and shadows, the human body, food chains and the environment and cells and systems across 41 questions worth 100 marks. Practise Science the way it's tested at P6 level in Singapore, with step-by-step answers on LearnBuddy.
Adrian put three grasshoppers and a dish of water in a glass jar. He used a sheet of clear plastic with some tiny holes to cover the jar as shown below. After a week, all the grasshoppers died.
What could Adrian have done so that the grasshoppers would stay alive?
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Bala wanted to find out if a fruit could still develop when a certain part of the flower was removed. The diagram below shows the part of a flower removed from flowers P, Q, R and S from the same plant.
Pollen grains from the same type of flower were dusted over flowers P, Q, R and S.
Which of the flowers P, Q, R or S will develop into a fruit?
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The diagram below shows how water and food are transported to and from parts A, B and C of a plant.
Which one of the following correctly represents parts A, B and C?
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Amin observed three cells under a microscope and made the following observations. A tick (✔) indicates that the cell part is present.
Which of the following statements is/are correct?
A Cells Y and Z cannot trap light.
B Both Cells X and Z are plant cells.
C Cell Z does not have a regular shape.
D Cell Y is the only cell that cannot make its own food.
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The diagram below represents a certain life process that takes place in green plants.
Which one of the following correctly represents Substances A, B, C, D and Energy T?
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The food relationship between three organisms is shown below.
The following took place when a large number of organism Z died.
Which of the following shows the correct sequence of events?
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The graphs below show how the population size of plant S and butterfly T change throughout the year.
Given that butterfly T only feeds on the nectar of the flowers of plant S, which one of the following graphs is correct?
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The diagram below shows Animal Q; a nocturnal mammal. Animal Q feeds on plants and insects. It has pincer-like hands to grasp branches for long periods of time. It covers its young with poisonous saliva by licking the toxin onto the baby's fur before heading off to find food.
The chart below shows how the adaptations stated above are classified.
Which one of the following correctly represents A, B and C?
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Young children are usually given plastic cup rather than glass cup when drinking.
Which of the following properties of plastic make it a more suitable material for young children to use than glass?
A It is light.
B It floats on water.
C It does not break easily.
D It does not allow light to pass through.
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Siew Teng labelled the ends of three metal bars, X, Y and Z, as shown in the diagram below.
She wanted to find out if the metal bars would repel or attract when they were brought close to each other.
Based on the results above, which of the following statements is/are correct?
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Guorong measured the mass of a basketball at the beginning of his experiment. After that, he pumped air into the basketball with an air pump. He then recorded the results in the table shown below.
Based on his results above, what can Guorong conclude?
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Farah took a wooden board and a clear glass pane of similar size and thickness. She cut out shapes from them as shown in the diagram. The wooden board and clear glass pane were then glued together and a light source was brought near them.
Which one of the following is the shadow formed on the screen?
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George filled two identical glasses with the same amount of water of the same temperature. He then placed spoons made of different materials in each glass as shown in the diagram below. After two minutes, he removed the spoon and measured the temperature of water in both glasses again. He found that the temperature of water in glass A was higher than the water in glass B.
Which of the following statements are correct?
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Ian set up an experiment to compare the rate of evaporation of two liquids, A and B. The diagrams below show four different set-ups J, K, L and M.
Which of the following set-ups will give a fair test?
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Samy wanted to find out the electrical conductivity of three rods, A, B and C, made of different materials. He inserted the rods into the circuit at different position, X, Y and Z as shown below.
Based on the results above, which statement is correct?
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A group of pupils conducted an experiment to find out the braking distance of a car travelling at a certain speed on a dry road. The braking distance is the distance the car has to cover when the brakes are applied before it comes to a complete stop. The graph below shows the data collected by the pupils.
Based on the graph above, which of the following statements is correct?
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A toy car, at Point A, was moving down a slope as shown below. After some time, the toy car stopped at point B. Compare the potential energy and kinetic energy of the toy car at points A and B.
Which one of the following is correct?
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The water garden feature below is solar-powered. The solar panel which absorbs energy from the Sun is connected to a motor in the bowl. The motor pumps water up into the jug through the water pipe. Then the water flows down the bowls.
Which one of the following statements is correct about the water garden feature above?
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Sarah saw an adult plant with bright and colourful flowers. The fruits were fleshy and had a sweet smell.
(a) Explain how the bright and colourful flowers help the plant to reproduce.
(b) Sarah noticed that the young plants grew far away from the adult plant. Describe how the seeds of the plant above can be dispersed over a wide area.
(c) How does being far away from the adult plants help the young plants to grow well?
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Study the human body system below.
(a) Put the letter 'A' in the box above to identify the organ that pumps blood around the body.
Put the letter 'B' in the box above to show where digested food is absorbed.
James wanted to find out if exercise affects the pulse rate. He measured the pulse rates of three friends when resting and after exercising for 20 minutes.
(b) What can James conclude about the effect of exercise on pulse rate?
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Meili carried out an experiment in a dark room. She placed a plant in a closed clear glass container as shown below.
(a) Meili switched on the lamp. She observed that the amount of oxygen in the container increased while the amount of carbon dioxide decreased. Name this process.
(b) Explain why she used a clear glass container for her experiment.
(c) Meili switched off the lamp. What would happen to the amount of oxygen and the amount of carbon dioxide after a while? Explain.
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Organism P lives in the grasslands. It has pattems on its body to blend in with its surroundings. It has strong legs to run fast but can only do so for less than a minute. As such, it usually tries to get closer to its prey before chasing it. It has keen eyesight and hunts during the day.
(a) Based on the information above, state one structural and one behavioural adaptation of Organism P that helps it hunt for food.
(b) After a speedy chase, Organism P will not be able to move much and needs to rest for half an hour. Explain why this could be a disadvantage for Organism P.
(c) Organism P sometimes prey in a group. State one advantage of hunting for food in this manner.
(d) Suggest a reason why having a thick yellow-grey coat is an advantage for the young of Organism P.
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There were five populations of organisms A, B, C, D and E in a pond community. Glenn kept some of the organisms together in containers over a period of time. The table below shows the outcome of the experiment.
(a) Based on the results of his experiment, construct a possible food web to show the relationships among the five organisms in the space provided below.
In Glenn's hometown, the period of daylight during the months of July to December is shorter than the first half of the year.
(b) Explain how this would affect the population size of organism A in the food web.
Glenn noticed that the plant population in the pond had been decreasing over the past few months.
(c) Without adding more plants, which one of the organisms, A, B, C, D or E, should Glenn add, to increase the plant population? Explain your answer.
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Zhi Wen conducted an experiment to compare the strength of four U-shaped magnets as shown below. He hung the magnets on strings of different lengths over a tray of pins. He recorded the number of pins attracted to the magnets in the table below.
(a) Which was the weakest magnet? Give a reason.
(b) Based on the set-up above, Zhi Wen. was unable to compare the strength of Magnets Y and Z. Give a reason.
(c) Magnet Y was replaced by a very strong magnet. Besides attracting more pins, state another possible observation that could happen.
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Yaakob collected three samples of liquids R, S and T from different sources. He placed each liquid in a container. He shone a torch through each container of liquid and placed a sheet of paper below the container as shown in the diagram below.
Yaakob observed how much light fell on the sheet of paper when each of the three liquid samples R, S and T was in the container. He recorded his observations in the table below.
(a) What was the aim of Yaakob's experiment?
(b) Based on Yaakob's observation, which liquid sample was the muddiest? Give a reason for your answer.
(c) State one variable which must be kept constant for the experiment to be a fair test.
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After a soccer game, Benny's friend used water mist to cool him. Tiny droplets are produced in the form of mist as shown below.
(a) Explain how the water mist is able to cool Benny after his soccer game.
Benny stands in front of a fan as shown.
(b) Explain how standing in front of the fan would help Benny cool more effectively.
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Xavier filled two identical metal cans with 200 cm³ of hot water and wrapped strips of metal of different sizes around them as shown below. He recorded the temperature of the water in each can every five minutes.
The results are shown in the table below.
(a) Based on the experiment above, explain why the water in Can X cooled faster than the water in Can Y.
(b) Which fox can lose more heat through its ears? Give a reason for your answer.
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The diagram below shows a two-way switch installed at the staircase. The bulb can be switched on or off from either ends of the staircase. At the moment, the bulb is switched off. The bottom switch is connected to point B while the top switch is connected to point C.
(a) David is at the bottom of the staircase. What can he do to switch on the bulb at the bottom of the staircase?
(b) David walks up the staircase after he has switched on the bulb at the bottom of the staircase. What can he do to switch off the bulb at the top of the staircase?
(c) David wants to install two more bulbs for the stairway while maintaining the same brightness as before for each bulb.
Draw two more bulbs and show the connections in the diagram below.
(d) Other than having the same brightness as before, what is the advantage of having the bulbs connected in the way you have drawn in (c)?
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Hailey conducted an experiment with the set-up shown below.
She pulled disc A and the elastic band back at different distances (X) and released it to find out how far disc A will travel (Y). She then recorded her results in the table shown below.
(a) Explain, in terms of energy conversion, how distance Y is affected by distance X.
(b) Fill in the boxes to show the main energy changes during the experiment.
(c) Hailey noticed that disc B travelled at a slower speed as compared to disc A. Explain, in terms of energy.
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Ahmad conducted an experiment using the set-up below. He used the launcher to give the 1 kg block a push. The block moved a distance, d, along surface Y before stopping. Ahmad repeated the experiment using a different surface, X. His results are shown in the table below.
(a) Name the force that caused the block to stop moving.
(b) In Ahmad's experiment, the launcher always pushed the block with the same amount of force. Why must the amount of force be the same?
(c) Explain why the block moved a shorter distance along surface Y than X.
(d) Ahmad repeated the experiment using a 2-kg block instead of a 1-kg block. He obtained the results shown below.
Based on Ahmad's results, how does the mass of the block affects the distance, d?
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