P4 Science CA2 2023 — Nan Hua

Q: The diagram below shows the life cycle of an insect which includes stages A, B and C. Which one of the following represents stages A, B and C?

B. Adult, Egg, Nymph. The diagram shows a 3-stage life cycle (incomplete metamorphosis): egg → nymph → adult. Following the arrows in the cycle, stage A is the adult (which lays eggs), B is the egg, and C is the nymph that hatches and grows into the adult.

Q: The diagram below shows the growth of a plant. At which stage is the plant able to make food?

C. C. A plant makes food by photosynthesis, which requires green leaves. Stage A shows a seed, stage B shows a germinating seedling with no leaves above ground, stage C shows a young plant with its first green leaves above the soil, and stage D shows a more mature plant. The plant first becomes able to make food once it develops green leaves above the soil at stage C.

Q: The four statements below are made by four students about the pupa of an insect. Amy: It does not breathe at this stage. Billy: It moves around to look for food. Collin: It is developing into an adult. David: It does not feed on anything at the stage. Which of the students are correct?

D. Collin and David. At the pupa stage, the insect is inactive and does not move around or feed, but it is still alive and respiring (so Amy is wrong because the pupa does breathe; Billy is wrong because the pupa does not move around to find food). Inside the pupa, the insect is developing into an adult (Collin) and does not feed (David). Therefore Collin and David are correct.

Q: Which of the following is not a matter?

C. shadow of a person. Matter is anything that has mass and occupies space. Water, air and flower petals all have mass and take up space. A shadow has no mass and does not occupy space — it is merely the absence of light. Therefore the shadow of a person is not matter.

Q: The diagram below shows a container with substance X placed in three different positions as shown below. Based on the diagram, what can you conclude about substance X? A: X occupies space B: X can be compressed C: X takes the shape of the container

C. A and C only. In all three positions substance X keeps the same volume (it does not get squashed into a smaller space), so X cannot be compressed — statement B is false. X clearly occupies space in every position (statement A is true) and changes shape to fit the container as the container is rotated (statement C is true). So the correct conclusion is A and C only, which matches a liquid.

P4 Science 2023 CA2 8 questions 20 marks

Source: Nan Hua, 2023

This P4 Science CA2 paper from Nan Hua (2023) covers animals and life cycles, plants, materials, matter and its states, heat and temperature and food chains and the environment across 8 questions worth 20 marks. Practise Science the way it's tested at P4 level in Singapore, with step-by-step answers on LearnBuddy.

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Q1 MCQ 2 marks 🖼 Visual

The diagram below shows the life cycle of an insect which includes stages A, B and C. Which one of the following represents stages A, B and C?

Q2 MCQ 2 marks 🖼 Visual

The diagram below shows the growth of a plant. At which stage is the plant able to make food?

Q3 MCQ 2 marks

The four statements below are made by four students about the pupa of an insect. Amy: It does not breathe at this stage. Billy: It moves around to look for food. Collin: It is developing into an adult. David: It does not feed on anything at the stage. Which of the students are correct?

Q4 MCQ 2 marks 🖼 Visual

Which of the following is not a matter?

Q5 MCQ 2 marks 🖼 Visual

The diagram below shows a container with substance X placed in three different positions as shown below. Based on the diagram, what can you conclude about substance X? A: X occupies space B: X can be compressed C: X takes the shape of the container

Q6 Structured 3 marks 🖼 Visual

Study the chart shown below. (a) State one similarity between animals A and C. [1] (b) State one difference between animals B and D. [1] (c) Fill in the table below correctly with the letters A, B, C or D to represent the following animals: A beetle | A frog [1]

Q7 Structured 3 marks 🖼 Visual

Study the life cycle of a mosquito shown below. (a) Identify stage K. [1] Study the graph below. (b) Based on the graph, what is the relationship between the temperature of the environment and the length of the life cycle of the mosquito? [1] (c) Dengue fever is spread by mosquitoes. Based on the graph in part (b), give a reason why the number of cases of dengue fever increases when the temperature of the environment increases. [1]

Q8 Structured 4 marks 🖼 Visual

Jack sealed the opening of a syringe before filling the syringe completely with matter X. He then put weights on the plunger of the syringe. He recorded the volume of matter X in the table below for every weight he added on the plunger. Weight added (g): 0, 1, 2, 3 — Volume of matter X (cm³): 100, 90, 82, 75. (a) State two common properties of all matter. [2] (b) Based on the table above, Jack concluded that matter X is a solid. Do you agree with Jack? Give a reason for your answer. [1] (c) Based on the diagram above, give a reason why Jack needed to seal the opening of the syringe before conducting the experiment. [1]

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