P5 Science SA1 2023 — Nan Hua

The diagram below shows two cells, X and Y. Which of the following correctly shows the type of cell, X and Y, and the function of part A in both cells?

The diagram below shows how substances, X and Y, are transported through the different parts of the plant, E and F. What do E, F, X and Y represent?

Three adults were trapped in a lift for an hour and there was no exchange of air from outside. Which of the following graphs shows the correct change in the composition of air in the lift?

The diagram below shows a human respiratory model. The table shows parts of the respiratory system represented by different parts of the model and their respective functions. Which of the following is/are correct? A: parts of the model = balloons, parts of the respiratory system = lungs, functions = to transport oxygen to all parts of the body. B: parts of the model = plastic bottle, parts of the respiratory system = nose, functions = to take in oxygen and remove carbon dioxide from the body. C: parts of the model = straw, parts of the respiratory system = windpipe, functions = to transport air to and from the lungs.

Sherwin conducted an experiment in a bright room with three set-ups, A, B and C, as shown below. The amount of carbon dioxide in the water in each set-up was 30 units at the start of the experiment. Which of the following correctly shows the amount of carbon dioxide in the three set-ups after a few hours?

The diagram below shows cell Q which is taken from a part of a plant. Two students observed cell Q using a microscope and made the following statements. Student A: Cell Q is likely taken from the root of the plant. Student B: Cell Q is likely taken from the leaf of the plant. Which student made the correct statement? Explain why.

Daniel set up an experiment as shown below to find out whether the amount of water taken in by a plant is affected by its number of leaves. He placed 2 similar plants with different number of leaves near a window and marked the water level of each set-up at the start of the experiment. After several days, he found out that the water level in set-up A was lower than the water level in set-up B. (a) State the changed variable in Daniel's experiment. (b) Why was the water level lower in set-up A than set-up B? (c) Explain clearly why oil was added to the surface of the water.

The diagrams below show the different parts in the respiratory systems of a fish and a human. (a) At which part, A, B, C or D, does gaseous exchange take place in a fish and human? Fish: ____ Human: ____ (b) Explain clearly how the fish gets oxygen for its survival.