Question 1

The diagrams below show the reproductive systems of a human and a plant. Which part in the reproductive system of the plant has a similar function as part X in the reproductive system of the human?

Accepted Answer

4. S. Part X labels the ovary in the human reproductive system, which produces female sex cells (egg cells). In the flower diagram, S labels the ovary of the plant, which also produces female sex cells (ovules). Therefore S has a similar function as X.

Question 2

The diagram below represents the water cycle.

Accepted Answer

2. A: rain, B: water, C: water vapour, D: cloud. In the water cycle: water (D in the diagram corresponds to body of water) evaporates into water vapour (C), water vapour rises and condenses to form cloud (B), and the cloud releases rain (A) which falls back to the water body. Matching this to the options, A = rain, B = water (collected), C = water vapour, D = cloud fits the cycle direction shown by the arrows, giving option 2.

Question 3

Ravi placed two identical cups near a window where there was sunlight. He filled one cup completely with liquid S and filled the other cup completely with liquid T. The next day, he observed that the cups were no longer full. What can Ravi conclude from his observation?
A. Liquid T evaporates faster than liquid S.
B. Both liquids evaporate.
C. Both liquids need sunlight for evaporation.
D. Both liquids will evaporate faster if there is wind.

Accepted Answer

1. B only. Ravi only observed that both cups had less water the next day — he can only conclude that both liquids evaporated (B). He cannot compare rates because he did not measure how much each lost (A is not supported). He did not test without sunlight, so C is not supported. He did not test with wind, so D is not supported. Only conclusion B is valid.

Question 4

The table shows the freezing point and boiling point of two substances, X and Y. Which of the following shows the correct state of substances X and Y at 120°C?

Accepted Answer

3. X: liquid, Y: solid. Substance X has freezing point 63°C and boiling point 125°C. At 120°C, X is above its freezing point but below its boiling point, so X is a liquid. Substance Y has freezing point 145°C, so at 120°C (which is below its freezing point), Y is still a solid. Therefore X is liquid and Y is solid.

Question 5

The graph below shows the change in temperature of a container of water over some time. Based on the graph above, which one of the following statements is correct?

Accepted Answer

1. The water was losing heat at Point E.. The graph shows a cooling curve: AB is a flat line at 100°C (water at boiling point losing heat without temperature change as it condenses/loses thermal energy), BC drops from 100°C to about 0°C (water cooling as liquid), CD is a flat line at 0°C (water freezing — changing from liquid to solid at constant temperature while losing heat), then DE drops below 0°C and EF is flat. Statement 1 is correct because the water continues to lose heat as it cools further toward and during EF. Looking at the options, AB does represent a phase change at the boiling point where the water is losing heat but temperature stays constant — making 'water did not lose heat or gain heat' wrong. CD is the freezing plateau where water changes from liquid to solid — so option 3 is actually correct.

P5 Science SA1 2025 — Nan Hua

Related papers