Question 1

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

Accepted Answer

C. A needs air, food and water to survive.. A is a rabbit (living thing) and B is a robot (non-living). Living things need air, food and water to survive. A robot cannot grow, reproduce, or respond to changes — it is non-living.

Question 2

Freddy conducted an experiment using four set-ups as shown below. Which two set-ups should he use to find out if living things need air to survive?

Accepted Answer

C. A and C. To test whether living things need air, only the presence of air should differ between set-ups; all other factors (food, water, grasshopper) must be the same. Set-up A has a lid with holes (air can enter), food, water and grasshopper. Set-up C has a sealed lid (no air), food, water and grasshopper. Only the air variable differs, so A and C are the correct fair test.

Question 3

The diagram below shows the classification of living things. Which of the following correctly describes the sub-headings, X and Y?

Accepted Answer

D. X: Reproduce by seeds / Y: Reproduce by spores. Group X contains Coconut Plant and Papaya Plant — flowering plants that reproduce by seeds. Group Y contains Bird's Nest Fern and Fern — non-flowering plants that reproduce by spores. Both groups need water and can make their own food, so the only valid distinction is the mode of reproduction.

Question 4

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

Accepted Answer

B. Animals in Group B have a beak.. Group A: dog and hamster (mammals, land animals, hair). Group B: pigeon and eagle (birds, both have beaks). Group C: snake and lizard (reptiles, dry scaly skin, lungs). The only correct statement is that all animals in Group B have a beak.

Question 5

Huiling grouped some animals into Group A and Group B as shown below. Based on your observation of the above, which characteristic of animals did Huiling use to classify the animals?

Accepted Answer

B. Presence of wings. Group A contains a parrot, a bee and a bat — all have wings. Group B contains a frog, an ant and a goat — none have wings. The classifying characteristic is the presence of wings.

Question 6

Study the chart below. Which of the following letters, A, B or C, best represents the two living things shown below?

Accepted Answer

D. Left: B / Right: C. The flowchart classifies living things by 'Does it make its own food?' (No → A) and then 'Does it grow on land?' (No → B, Yes → C). The first picture shows a plant growing in water — it makes its own food (Yes) but does not grow on land (No) → B. The second picture shows a fern growing on soil — it makes its own food (Yes) and grows on land (Yes) → C.

Question 7

Study the table below carefully. A tick (✓) shows that the animal has the characteristic. Which animals, X, Y and Z, can represent Animal A and Animal B shown below?

Accepted Answer

A. Animal A: Z / Animal B: Y. From the characteristics table: X has wings, Y has hair as outer covering, Z has dry skin covered with scales. Animal A is a crocodile (dry scaly skin) → Z. Animal B is a chimpanzee/ape (hair as outer covering) → Y.

Question 8

Sam had an accident and his left leg was badly injured. After recovery, his left leg was replaced with an artificial one, Part X. Part X enables Sam to run. Which body system is part X replacing?

Accepted Answer

A. skeletal system. Bones support the body and allow movement. An artificial leg replaces the bone of the leg, so it replaces the skeletal system.

Question 9

The diagram below shows the human digestive system. In which of the above organs, J, K, L, M and N, are digestive juices found?

Accepted Answer

C. J, L and M only. Digestive juices are found in the mouth (J = saliva), the stomach (L = gastric juice) and the small intestine (M = intestinal juice from the liver/pancreas/small intestine). K is the oesophagus and N is the large intestine — neither produces digestive juices.

Question 10

Below is a bar graph that shows different organs of a human digestive system. The organs are not placed in order. Each bar shows the amount of food digested just before it leaves each organ. Which digestive organ represents the large intestine?

Accepted Answer

B. Bar (2) — shortest, fully undigested. By the time food leaves the large intestine, most of it has already been digested and absorbed; only a small amount of undigested waste remains. Bar (2) is the shortest, indicating the smallest amount of food (all undigested waste) — this matches the large intestine.

Question 11

Mindy describes the following human systems. System A: breaks down food. System B: supports the body. System C: takes in air for the body. Which of the following body systems correctly matches the descriptions given by Mindy?

Accepted Answer

D. A: Digestive / B: Skeletal / C: Respiratory. The digestive system breaks down food (A). The skeletal system supports the body (B). The respiratory system takes in air for the body (C).

Question 12

James has a lightweight sanitiser bottle that will not break easily when it is dropped onto the floor. He can also see the amount of sanitiser left in the bottle. Which of the following is most likely the material of Part X?

Accepted Answer

D. clear plastic. The bottle must be lightweight (rules out metal and ceramic), unbreakable when dropped (rules out glass and ceramic), and transparent (rules out metal). Clear plastic is light, durable on impact, and transparent.

Question 13

Bala bought a toy duck for his baby sister to play with while bathing in her bathtub filled with water. His baby sister loves squeezing the floating toy duck to make a squeaky sound. She also plays with the toy by throwing it around. Which material, A, B, C or D, is the toy duck made of?

Accepted Answer

C. Material C — flexible: Yes / waterproof: Yes / strong: Yes. The toy must be flexible (so it can be squeezed to make a sound), waterproof (used in a bathtub and floats), and strong (survives being thrown around). Only Material C has Yes for all three properties.

Question 14

Peter carried out an experiment shown below using rods made of different materials, W, X, Y and Z. He attached a 3 kg weight to each rod and measured the distance, d, as shown below. He recorded his results in the graph below. Which material, W, X, Y or Z, is most suitable to make the rod to display the bunches of bananas at a fruit stall if the shopkeeper wants the rod to bend the least?

Accepted Answer

A. W. Distance d measures how much the rod bends downward — a smaller d means a stiffer (stronger) material. From the bar graph, W has the smallest d (close to 0 cm). Therefore W bends the least and is the most suitable.

Question 15

Jane placed 4 solids made of materials W, X, Y and Z into a container of water. The 4 solids were of the same size. What can Jane conclude based on her observation?

Accepted Answer

C. X and Y are the same material.. All four solids are the same size. W floats at the top (least dense). Z is partly submerged in the middle of the water. X and Y both sink and rest at the bottom of the tank — they behave identically, so they have the same density and most likely are the same material. W cannot be the heaviest because it floats. Z heavier than Y is wrong (Y sinks; Z is suspended/floating mid-water → Y is heavier). W and X being different materials is true but does not follow directly as the strongest conclusion the diagram supports.

Question 16

Susan carried out an experiment to find out the strength of four magnets, E, F, G and H. She recorded the results in the table below. Based on the results above, which of the following sentence is correct?

Accepted Answer

C. Magnet H is weaker than magnet G.. More paper clips attracted = stronger magnet. E=4, F=7, G=6, H=5. F is the strongest (not E or weakest); H (5) is weaker than G (6) — correct; G (6) is weaker than F (7), not stronger.

Question 17

Suyin brought a magnet close to each of the objects below. Which of the above items would not be attracted by the magnet?

Accepted Answer

A. A and C. Magnets attract only magnetic materials (iron, steel, nickel, cobalt). A ceramic tile is non-magnetic; an iron nail is magnetic; a glass marble is non-magnetic; a steel cup is magnetic. So A (ceramic tile) and C (glass marble) would NOT be attracted.

Question 18

David arranged 3 bar magnets and a compass as shown in the diagram below. The needle of the compass is made of a magnet. Which of the following shows the correct direction of the compass needle in the above diagram?

Accepted Answer

B. Compass needle points left (north pole left).. The nearest end of the bar-magnet chain facing the compass is a North pole (since the visible far end is labelled S, and unmarked ends alternate N–S through the chain so the end closest to the compass is N). Like poles repel, so the compass needle's north pole is pushed away from this N pole — pointing left (away from the magnet, toward the compass-needle's left).

Question 19

Study the set-ups below. Which of the following shows the correct order of the electromagnets from the weakest to the strongest magnetic strength?

Accepted Answer

D. R → S → Q. Electromagnet strength depends on (i) number of battery cells and (ii) number of coil turns. Set-up Q: 3 cells, 20 turns (strongest). Set-up R: 1 cell, 10 turns (weakest). Set-up S: 3 cells, 10 turns (in between). Weakest → strongest = R → S → Q.

P3 Science SA2 2020 — Tao Nan

Related papers