P3 Science CA1 2025 — Tao Nan | Singapore Past Year Paper

Q: Study the table below. Which one of the following statements is correct?

(3) A needs air, food and water to survive.. The image shows a dog (A) and a robot (B). Dogs are living things and require air, food, and water to survive, which is a correct characteristic. Robots are non-living things, they cannot grow, reproduce, or respond to changes like living things do. Therefore, statement (3) is correct.

Q: Which of the following statements about bacteria and fungi is incorrect?

(2) Both reproduce by spores.. Both bacteria and fungi respond to changes, feed on dead and living things, and can be useful or harmful. However, bacteria primarily reproduce by binary fission, not by spores. Fungi typically reproduce by spores. Thus, the statement that 'Both reproduce by spores' is incorrect.

Q: Study the pictures below. How are the living things classified in groups C and D?

(1) Has leaves and stem / Does not have leaves and stem. Group C contains a coconut tree and a papaya tree, which are plants with leaves and stems. Group D contains mushrooms and mould, which are fungi and do not have leaves and stems. Therefore, option (1) correctly describes this classification. Option (4) is incorrect because fungi (Group D) are unable to make their own food, while plants (Group C) are able to.

Q: Fatimah wants to find out if the animal shown below is a bird. Which main characteristic helps to determine if the animal is a bird?

(3) feathers. The most unique and main characteristic that defines birds and distinguishes them from other animal groups is the presence of feathers. While other animals might have tails, beaks (e.g., turtles), or claws, only birds possess feathers.

Q: Study the flowchart below. Which animal groups do E, F, G and H represent?

(4) mammal / insect / reptile / fish. Following the flowchart: 1. 'Does it have hair on its body?' Yes leads to E. Animals with hair are Mammals. So E = Mammal. 2. If No (no hair): 'Does it have three body parts?' Yes leads to F. Animals with three body parts (head, thorax, abdomen) are Insects. So F = Insect. 3. If No (no three body parts): 'Does it have dry skin with scales?' Yes leads to G. Animals with dry skin and scales are Reptiles. So G = Reptile. 4. If No (no dry skin with scales): No leads to H. Given the previous classifications, H would be Fish, which do not have hair, three body parts, or dry skin with scales (their scales are wet). This matches option (4).

Q: The table below shows the characteristics of living things X, Y and Z. Which of the following statements is definitely true?

(1) X and Y are plants.. Let's analyze each living thing based on the table: - X: Makes its own food (Yes), Can have fruits (Yes). This describes a flowering plant that bears fruits. - Y: Makes its own food (Yes), Can have fruits (No). This describes a plant that does not bear fruits (e.g., non-flowering plants like ferns, mosses, or gymnosperms). - Z: Makes its own food (No), Can have fruits (No). This describes a heterotrophic organism like an animal, fungus, or bacteria. Now evaluate the options: (1) X and Y are plants: Both X and Y can make their own food, which is the defining characteristic of plants. This statement is definitely true. (2) Z is a type of bacteria: Z could also be an animal or a fungus. It's not *definitely* bacteria. (3) Z reproduces by spores: Z could be an animal, which does not reproduce by spores. It's not *definitely* true. (4) Y and Z are non-flowering plants: Y could be a non-flowering plant. However, Z is not necessarily a plant at all. It's not *definitely* true. Therefore, statement (1) is the only one definitely true.

Q1 MCQ 2 marks 🖼 Visual

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

Q2 MCQ 2 marks

Which of the following statements about bacteria and fungi is incorrect?

Q3 MCQ 2 marks 🖼 Visual

Study the pictures below. How are the living things classified in groups C and D?

Q4 MCQ 2 marks 🖼 Visual

Fatimah wants to find out if the animal shown below is a bird. Which main characteristic helps to determine if the animal is a bird?

Q5 MCQ 2 marks 🖼 Visual

Study the flowchart below. Which animal groups do E, F, G and H represent?

Q6 MCQ 2 marks 🖼 Visual

The table below shows the characteristics of living things X, Y and Z. Which of the following statements is definitely true?

Explanation Let's analyze each living thing based on the table: - X: Makes its own food (Yes), Can have fruits (Yes). This describes a flowering plant that bears fruits. - Y: Makes its own food (Yes), Can have fruits (No). This describes a plant that does not bear fruits (e.g., non-flowering plants like ferns, mosses, or gymnosperms). - Z: Makes its own food (No), Can have fruits (No). This describes a heterotrophic organism like an animal, fungus, or bacteria. Now evaluate the options: (1) X and Y are plants: Both X and Y can make their own food, which is the defining characteristic of plants. This statement is definitely true. (2) Z is a type of bacteria: Z could also be an animal or a fungus. It's not *definitely* bacteria. (3) Z reproduces by spores: Z could be an animal, which does not reproduce by spores. It's not *definitely* true. (4) Y and Z are non-flowering plants: Y could be a non-flowering plant. However, Z is not necessarily a plant at all. It's not *definitely* true. Therefore, statement (1) is the only one definitely true.

Q7 Structured 1 mark 🖼 Visual

Janet planted a seed in her garden and observed it over a period of 5 weeks. She measured and recorded its height as shown in the table below. (a) From the table above, what do you observe about the height of the plant over the past 5 weeks? (b) Based on the changes in the height of the plant, state the characteristics of living things shown.

Q7 Structured 1 mark

Janet planted a seed in her garden and observed it over a period of 5 weeks. She measured and recorded its height as shown in the table below. (a) From the table above, what do you observe about the height of the plant over the past 5 weeks? (b) Based on the changes in the height of the plant, state the characteristics of living things shown.

Q8 Structured 1 mark 🖼 Visual

Study the classification chart below. (a) Suggest suitable headings for Groups G and H.

Q8 Structured 1 mark

Study the classification chart below. (b) Are all plants which do not have flowers considered non-flowering plants? Explain your answer.

Q9 Structured 1 mark 🖼 Visual

Visual context

Two tables and an image. - Top table shows experimental conditions for bread slices P, Q, R, S: - Bread P: Amount of water (ml)=0, Temperature (°C)=26 - Bread Q: Amount of water (ml)=10, Temperature (°C)=28 - Bread R: Amount of water (ml)=10, Temperature (°C)=30 - Bread S: Amount of water (ml)=10, Temperature (°C)=32 - An image displays four slices of bread labeled P, Q, R, S, showing increasing amounts of mould from P (no mould) to S (heavy mould). - Bottom table shows conditions for four new set-ups A, B, C, D to test light: - Set-up A: Amount of water (ml)=0, Temperature (°C)=2, Presence of light=No, Type of bread=White - Set-up B: Amount of water (ml)=10, Temperature (°C)=20, Presence of light=Yes, Type of bread=White - Set-up C: Amount of water (ml)=5, Temperature (°C)=2, Presence of light=Yes, Type of bread=Wholemeal - Set-up D: Amount of water (ml)=10, Temperature (°C)=20, Presence of light=No, Type of bread=White

In an experiment, Sonya kept four identical slices of bread P, Q, R and S under different conditions as shown below. After two weeks, Sonya counted the number of patches of mould on the four slices of bread. She recorded her observations in the table below. (a) Based on the results, state the conditions for the most amount of mould to grow.

Q9 Structured 1 mark 🖼 Visual

Visual context

Two tables and an image. - Top table shows experimental conditions for bread slices P, Q, R, S: - Bread P: Amount of water (ml)=0, Temperature (°C)=26 - Bread Q: Amount of water (ml)=10, Temperature (°C)=28 - Bread R: Amount of water (ml)=10, Temperature (°C)=30 - Bread S: Amount of water (ml)=10, Temperature (°C)=32 - An image displays four slices of bread labeled P, Q, R, S, showing increasing amounts of mould from P (no mould) to S (heavy mould). - Bottom table shows conditions for four new set-ups A, B, C, D to test light: - Set-up A: Amount of water (ml)=0, Temperature (°C)=2, Presence of light=No, Type of bread=White - Set-up B: Amount of water (ml)=10, Temperature (°C)=20, Presence of light=Yes, Type of bread=White - Set-up C: Amount of water (ml)=5, Temperature (°C)=2, Presence of light=Yes, Type of bread=Wholemeal - Set-up D: Amount of water (ml)=10, Temperature (°C)=20, Presence of light=No, Type of bread=White

In an experiment, Sonya kept four identical slices of bread P, Q, R and S under different conditions as shown below. After two weeks, Sonya counted the number of patches of mould on the four slices of bread. She recorded her observations in the table below. (b) Sonya then wanted to find out if the presence of light affects the growth of mould She has 4 set-ups below each with bread of an identical size. Which 2 set-ups A, B, C or D should she use so that she can conduct a fair test?

Q10 Structured 1 mark 🖼 Visual

Study the pictures below carefully. (The animals are not drawn to scale.) (a) Circle the animal group each of the above animals belong to. Animal X: (Bird / Fish / Amphibian / Reptile / Mammal / Insect) Animal Y: (Bird / Fish / Amphibian / Reptile / Mammal / Insect)

Q10 Structured 1 mark

Study the pictures below carefully. (The animals are not drawn to scale.) (b) Study animal Z. Does it belong to the same animal group as animal X? Explain why using a unique characteristic of that animal group.

P3 Science CA1 2025 — Tao Nan

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