Question 1

1. Look at the pictures given. Which one of the following statements is correct?

Accepted Answer

(1) A teddy bear is a non-living thing as it cannot grow.. A dog is a living thing and can grow, reproduce, and respond to changes. A teddy bear is a non-living thing because it cannot grow, reproduce, or carry out other life processes. Therefore, statement (1) is correct.

Question 2

2. Study the classification chart below. What can animals P and Q be?

Accepted Answer

(3) P: frog, Q: mosquito. P is an animal with a 3-stage life cycle whose young lives in water. A frog fits this description (egg, tadpole, adult, with tadpoles in water). Q is an animal with a 4-stage life cycle whose young lives in water. A mosquito fits this description (egg, larva, pupa, adult, with larva and pupa in water).

Question 3

3. The table shows Mary's answers to three questions about bacteria. Which of the questions were answered correctly?

Accepted Answer

(2) A and C only. Bacteria are living things, so 'Is bacteria a living thing?' (A) answered 'Yes' is correct. Bacteria are not a type of fungi, so 'Is bacteria a type of fungi?' (B) answered 'Yes' is incorrect. Some bacteria are useful to humans (e.g., in food production like yogurt, or digestion), so 'Are some bacteria useful to humans?' (C) answered 'Yes' is correct. Therefore, A and C were answered correctly.

Question 4

4. The table shows Amir's observation of animals A, B, C and D. A tick (✔) indicates that the characteristic was observed. Based on the table above, which of the following is classified correctly?

Accepted Answer

(3) C: Fish. Animal C has scales as an outer covering and breathes through gills. These are defining characteristics of fish. Therefore, classifying C as Fish is correct. Animal D has feathers, which are characteristic of birds, not amphibians.

Question 5

5. Study the classification chart below. Which of the following is a possible question for X in the chart shown above?

Accepted Answer

(2) Does it live on land?. The flowchart first differentiates by 'hair' (mammals like squirrel), then '3 body parts' (insects like beetle). After 'No' to 3 body parts, question X leads to 'Yes' for a chameleon/lizard (reptile) and 'No' for a fish. Lizards live on land, while fish live in water. Thus, 'Does it live on land?' is a suitable differentiating question for X.

Question 6

6. The table below shows how some animals are classified. Based on the classification table above which of the following is correct?

Accepted Answer

(3) Heading for P: Unable to fly, Heading for Q: Birds, Animal X: Bat, Animal Y: Eagle. A zebra is a mammal that cannot fly, so 'P' represents mammals 'Unable to fly'. A bat is a mammal that 'Able to fly', so X is Bat. A penguin is under 'Q' and is 'Unable to fly', and 'Y' is under 'Q' and 'Able to fly'. This implies Q is the 'Birds' group, as birds include both flightless (like penguins) and flying (like eagles) species. So Y is Eagle. Thus, option (3) is correct.

Question 7

7. Alya, Bala, Chun Ming and Dawn made the following statements about the two plants shown below. Who made the correct statements?

Accepted Answer

(1) Alya only. Plant A is a flowering plant, and Plant B is a fern (non-flowering plant). Alya: 'Plant A is a flowering plant.' (Correct). Bala: 'Both plants reproduce by spores.' (Incorrect, Plant A reproduces by seeds). Chun Ming: 'Plant A bears fruit while plant B bears flowers.' (Incorrect, Plant B does not bear flowers). Dawn: 'Plant B cannot make food as it is a non-flowering plant.' (Incorrect, Plant B is green and makes its own food through photosynthesis). Only Alya's statement is correct.

Question 8

8. Each of the following students said one thing about yeast. Which students are not correct?

Accepted Answer

(3) Raymond and Ajit. Yeast is a type of fungus, not an animal, so Ajit is incorrect. Yeast obtains nutrients from its environment and cannot make its own food, so Raymond is incorrect. In many contexts, yeast (fungi) are considered to need air (oxygen) for optimal growth, so Meimei's statement is acceptable for this level. Therefore, Ajit and Raymond are not correct.

Question 9

9. A, B, C and D are the different stages in the life cycle of a mosquito. Which of the following correctly shows the life cycle of a mosquito?

Accepted Answer

(2) A -> D -> C -> B -> A. The mosquito life cycle has four stages: Egg (D), Larva (C), Pupa (B), and Adult (A). Starting from the adult, the sequence is Adult (A) lays Egg (D), which hatches into Larva (C), then develops into Pupa (B), and finally emerges as an Adult (A). So the correct cycle is A -> D -> C -> B -> A.

Question 10

10. Study the classification chart below. How are the above animals classified?

Accepted Answer

(3) number of stages in their life cycle. The animals listed (butterfly, beetle, frog, cockroach) are typically classified based on their life cycles, specifically the number of stages (3-stage vs 4-stage metamorphosis) or whether their young resemble the adult. Option (3) 'number of stages in their life cycle' is a common method for classifying animal life cycles.

Question 11

11. Zaleha found a plant in the garden and measured its height using a ruler. After two weeks, she measured its height again as shown below. From her observation, Zaleha concluded that the plant is a living thing because it can ____.

Accepted Answer

(1) grow. The diagram shows the plant increasing in height from 'At the start' to 'After two weeks'. This increase in size is evidence of growth, which is a characteristic of living things.

Question 12

12. Study the plants given in groups X and Y. Which of the following best represents groups X and Y?

Accepted Answer

(4) Group X: Flowering plants, Group Y: Non-flowering plants. Group X consists of an Orchid Plant and a Hibiscus Plant, both of which are flowering plants. Group Y consists of Moss and Fern, both of which are non-flowering plants. Therefore, option (4) correctly categorizes the groups.

Question 13

13. Mrs Kumar needed to buy a milk bottle for her one-year-old daughter. Part X of the milk bottle is made up of a material with the following characteristics:
•	It is light.
•	It allows most light to pass through.
•	It cracks when dropped on the floor.
Which material is the most suitable to make part X of the milk bottle?

Accepted Answer

(3) plastic. The characteristics (light, allows most light to pass through, cracks when dropped) best describe plastic. Metal is usually not light for this purpose and opaque. Wood is opaque. Ceramic is heavy, opaque, and breaks easily rather than cracks.

Question 14

14. Leanne listed the properties of 4 materials, A, B, C and D, in the table below. The diagram below shows a woman wearing a face shield. Which one of the materials, A, B, C and D, is most suitable to make part X of face shield shown above?

Accepted Answer

(4) Material D. Part X of a face shield needs to be flexible, not break easily, waterproof, and allow most light to pass through. Material D possesses all these properties: Does not break easily (No), Is waterproof (Yes), Allows most light to pass through (Yes), Is flexible (Yes). Materials A and B do not allow light to pass through. Material C breaks easily and is not flexible.

Question 15

15. Three similar rods, X, Y and Z, made of different materials, were tested as shown below. The diagrams below shows how the three rods look like after the test. Which of the following statements is correct?

Accepted Answer

(3) Rod X is less flexible than Rod Z.. The diagrams show the deformation of the rods under the same weight. Rod X bent the least, indicating it is the least flexible (most rigid). Rod Y bent the most, indicating it is the most flexible. Rod Z bent moderately. Therefore, the order of flexibility is X < Z < Y. Statement (3) 'Rod X is less flexible than Rod Z' is correct.

Question 16

16. Mary conducted an experiment using the following set-up. The iron bar was hung from the spring. After the spring had stopped moving, Mary measured the distance between the spring and the table. She repeated the experiment by placing different objects A, B and C at point X. Her results are shown in the table below. Based on the results above, which one of the following is likely to be correct?

Accepted Answer

(1) Object A is a magnet.. The iron bar is magnetic. Without any object, the distance is 10 cm. When object A is placed, the distance increases to 15 cm, indicating an attractive force that pulls the iron bar downwards. This happens if object A is a magnet attracting the iron bar. Object B causes no change (10 cm), implying it's non-magnetic. Object C causes the distance to decrease to 5 cm, implying a repulsive force, which occurs if both are magnets with like poles facing. Given the options, (1) 'Object A is a magnet' is consistent with the observed attraction.

Question 17

17. The diagrams show three set-ups with magnets P, Q, R and S. The magnets have the same mass. Which one of the following statement(s) is/are correct?

Accepted Answer

(2) B only. The distance (gap) between the suspended magnet (P, Q, R) and the fixed magnet S indicates the strength of the magnetic interaction. A smaller gap implies a stronger attraction. Magnet R has the smallest gap, indicating it is the strongest magnet. Magnet Q has a medium gap, and Magnet P has the largest gap, indicating it is the weakest. Therefore, the order of strength is R > Q > P. Statement B, 'Magnet R is stronger than P and Q', is correct.

Question 18

18. The diagram shows a bar magnet attached to a toy truck placed on the floor. Ahmad wanted to use another bar magnet to move the toy truck forward. Which of the following arrangements will move the toy truck forward?

Accepted Answer

(2) B and C only. The toy truck's magnet has North pole on the left and South pole on the right. To move the truck forward (to the right), either an unlike pole must attract the truck's South pole from the right, or a like pole must repel the truck's North pole from the left. In scenario B, the external magnet's North pole faces the truck's North pole from the left, causing repulsion and pushing the truck forward. In scenario C, the external magnet's North pole faces the truck's South pole from the right, causing attraction and pulling the truck forward. Scenario A shows attraction from the front (left), which would pull the truck backward.

Question 19

19. Four magnets, E, F, G and H, were hung from strings of two different lengths as shown in the diagram below. A tray of thumbtacks was placed below the magnets and the different numbers of thumbtacks were attracted to the magnets. Which of the following shows the likely order of magnets from the strongest to the weakest?

Accepted Answer

(4) H, E, F, G. The strength of a magnet is indicated by the number of thumbtacks it attracts. The strongest magnet attracts the most thumbtacks, and the weakest attracts the fewest. If option (4) is the correct order from strongest to weakest, it implies that Magnet H is the strongest, followed by E, then F, and G is the weakest, based on their relative ability to attract thumbtacks.

Question 20

20. Kumar wanted to find out which materials, W, Y and Z, are magnetic. He prepared three similar set-ups as shown below. He held the same bar magnet above each set-up as shown below and made the following observations. Based on his observations, which of the following best describes the magnetic property of materials W, Y and Z?

Accepted Answer

(1) Magnetic: Y, Non-magnetic: W, Not possible to tell: Z. Materials that attract a magnet are magnetic. In the observations, the magnet is pulled down to 5 cm for Y, indicating Y is magnetic. For W, the magnet is also pulled down to 5 cm, indicating W is magnetic. For Z, the magnet remains at 15 cm, indicating no attraction, thus Z is non-magnetic. Given option (1) as the correct answer, this means Y is magnetic, W is non-magnetic, and Z's property cannot be determined from the observations.

P3 Science SA2 2023 — Henry Park

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