This P4 Science SA1 paper from Nan Chiau (2025) covers plants, the human body, cells and systems and materials across 13 questions worth 22 marks. Practise Science the way it's tested at P4 level in Singapore, with step-by-step answers on LearnBuddy.
The diagram below shows a floating water plant in a tank. Which one of the following is correct?
Q2MCQ1 mark🖼 Visual
The diagram below shows a tree being blown by strong wind. The ____ of the tree prevented it from being blown away by the strong wind.
Q3MCQ1 mark🖼 Visual
Caius prepared two similar setups A and B and placed them under the Sun for two days as shown below. Which of the following shows the amount of water left in each setup after two days?
Q4MCQ1 mark🖼 Visual
The diagram below shows part of a human skeleton. Part X protects the ____. A: brain B: heart C: lungs
Q5MCQ1 mark🖼 Visual
The diagram below shows parts of the human digestive system. Which of the following letters are correctly matched to its function?
Q6MCQ1 mark🖼 Visual
The diagram below shows a syringe that is connected to a container. When the plunger is pushed in completely, 50 cm³ of air is pushed into the container. What would be the volume of air in the container after fully pushing the plunger twice?
Q7MCQ1 mark🖼 Visual
Mary bought a cup of juice as shown in diagram 1. While drinking the juice through a straw, she observed some juice inside the straw as shown in diagram 2. From her observation only, Mary concluded that the juice ____.
Q8MCQ1 mark🖼 Visual
Study the flowchart below. Which of the following items correctly represent X, Y and Z?
Q9Structured4 marks🖼 Visual
Peter placed two similar potted plants A and B in a field. He only watered plant A. A few days later, he observed that plant A continued to grow healthily while plant B had withered. (a) What type of stem do both plants A and B have? [1] (b) Explain how the poles help both plants when making food. [2] (c) Explain why plant B withered. [1]
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The diagrams below show two different types of flowering plants E and F. (a) What is the function of part X? [1] (b) The roots of plant E are more widely spread than the roots of plant F. Give one advantage of having more widely spread roots. [1]
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The graph below shows the amount of undigested food as it leaves each part of the human digestive system. (a) Identify part G and part H of the human digestive system. Part G: ____ Part H: ____ [1] (b) Explain why the amount of undigested food that leaves both the large intestine and small intestine is the same. [1]
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Jenny attached a balloon to the mouth of a plastic bottle with its bottom cut off as shown in the diagram. (a) When she pushed the bottle into the water, the balloon became inflated. Explain why this happened. [1] Jenny removed the balloon and sealed the mouth of the opening. She repeated the experiment and pushed the bottle into the water. (b) Draw the water level in the bottle. [1] (c) Explain your answer in (b). [1]
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Lucas pumped air into a travel pillow as shown in the diagram. (a) Which physical property of air does this show? [1] (b) Did the mass of the travel pillow increase, decrease or remain the same after Lucas pumped air into it? Give a reason for your answer. [1] The pillow is sealed and can be pressed down a little when someone is lying on it. (c) Which physical property of air allowed the pillow to be pressed down? [1]
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