Question 1

The diagram below shows a park. Which of the following things need air, food and water to survive?

Accepted Answer

B. D and E only. Only living things need air, food and water to survive. In the park diagram, A is a lamp post (non-living), B is a bench (non-living), C is a rubbish bin (non-living), D is a tree (living), and E is a dog (living). Therefore only D and E need air, food and water.

Question 2

Adriel kept two fish in a fish tank. He fed the fish every day and did not add in any new fish to the tank. He noticed that the number of fish increased after a few weeks. Why did the number of fish increase?

Accepted Answer

A. The fish reproduced.. Since no new fish were added but the number of fish increased, the original fish must have produced young of their own kind. This is the life process of reproduction.

Question 3

Look at the pictures of the living things, A and B, shown below. Which of the following statements about A and B are true?
A  Both can grow.
B  Both can reproduce.
C  Both can make their own food.

Accepted Answer

B. A and B only. A is a mushroom (fungus) and B is a plant. Both grow and both reproduce, so statements A and B are true. However, only the plant can make its own food through photosynthesis; the mushroom cannot make its own food, so statement C is false.

Question 4

Which of the following are true about bacteria?
A  Bacteria can reproduce.
B  Bacteria can make their own food.
C  Bacteria can only be seen with a microscope.
D  Bacteria respond to changes in the surrounding.

Accepted Answer

D. A, C and D only. Bacteria reproduce (A is true), they are microscopic so can only be seen with a microscope (C is true), and they respond to changes in their surroundings (D is true). Bacteria generally cannot make their own food (B is false). Therefore A, C and D are correct.

Question 5

Jiayi wanted to carry out an experiment to find out if plants need water to grow. She used two identical pots of plants, X and Y, for her experiment. The conditions for Pot X are shown in the table below. Which of the following conditions should Jiayi use for Pot Y so as to conduct a fair experiment?

Accepted Answer

C. Amount of water 0 mL, Number of hours in the sun daily 5. To test whether plants need water, the amount of water must be the variable that is changed between Pot X and Pot Y. All other conditions (such as hours of sunlight) must be kept the same. Pot X has 100 mL of water and 5 hours of sun. Pot Y must have 0 mL of water (the change) and 5 hours of sun (kept the same). This is option C.

Question 6

Dave kept the same number of beetles in four tanks, A, B, C and D, as shown in the diagram below. The beetles were left in the tanks for three weeks. Which tank would have the greatest number of beetles alive after three weeks?

Accepted Answer

A. Tank A. Beetles need air, water and food to survive. Tank A has holes (air), water and bread (food). Tank B is air-tight with bread (no air, no water). Tank C is air-tight with water and bread (no air). Tank D has holes (air) but no water and no food. Only Tank A provides all three needs, so Tank A would have the greatest number of beetles alive after three weeks.

Question 7

Jon observed an animal. Which one of the following pair of observations would help Jon conclude that the animal is a mammal or a reptile?

Accepted Answer

C. Mammal: Gives birth; Reptile: Lays eggs. A defining difference between mammals and reptiles is how they produce young: most mammals give birth to live young, while reptiles lay eggs. The other options are not reliable distinguishing features (both groups can be found on land, both can have four legs, and diet varies within each group).

Question 8

Some objects are classified into two groups, X and Y, as shown below. Which of the following are the most suitable headings for groups X and Y?

Accepted Answer

A. Group X: Flexible; Group Y: Not flexible. Group X contains a paper towel and a rubber floor mat — both are flexible (can bend without breaking). Group Y contains a glass mug and a metal spoon — both are not flexible (rigid). Therefore the most suitable headings are 'Flexible' for X and 'Not flexible' for Y.

Question 9

Meiling wanted to find out the strength of materials W, X, Y and Z. She placed identical weights on the material, as shown in the set-up below. The materials were of the same size, thickness and shape. She recorded the number of weights needed to break each material in the table below. What could be a possible conclusion based on the results in the table above?

Accepted Answer

D. Z is stronger than Y.. The greater the number of weights needed to break the material, the stronger the material. W needs 20 weights, X needs 3, Y needs 8, Z needs 15. So the order from strongest to weakest is W > Z > Y > X. Therefore Z (15) is stronger than Y (8), making option D correct.

P3 Science SA1 2025 — Red Swastika

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