P5 Science CA2 2023 — Tao Nan

The diagram below shows a plant. M is a part of the root where excess food is stored. The plant is kept in a brightly lit garden and watered regularly. It is observed that part M grows bigger after one month. Which of the following statements is true?

Study the diagrams of the female human reproductive system and the plant reproductive system below. Which part of the female human reproductive system has a similar function as part S?

Which of the following correctly classifies the parts into the respective body systems?

The diagrams below show the seed dispersal patterns of two different plants, A and B. Which of the following shows the correct method of seed dispersal and a likely characteristic of the fruit?

The diagram below shows the circulation of blood in the human body. Arrows P, Q, R and S, are blood vessels carrying blood rich in either oxygen or carbon dioxide. Which of the following correctly shows the blood content in these vessels?

The diagram below shows the water cycle. Which processes involve a change in the state of water?

The diagram below shows the changes in the state of water. The processes involved are represented by W, X, Y and Z. Which one of the following statements is true?

Jericho placed a beaker of ice on a table at room temperature. He monitored the temperature of the content in the beaker with a thermometer, and recorded the temperature over time. Which one of the following graphs shows the changes in the temperature of the content in the beaker over time correctly?

The diagram below shows two types of reproductive cells, A and B. (a) State the reproductive organs where the following type of cells are produced in. (i) Organ producing cell A: _______ (ii) Organ producing cell B: _______ (b) State the process in the diagram: _______

A group of students were trapped in a lift. They shouted for help continuously for 30 minutes. The two bar graphs below show the volume of gases, A, B and C, in the lift at the 0th minute and at the 30th minute. (a) Identify the two gases. Gas B: _______ Gas C: _______ (b) If the students kept calm and quiet for 30 minutes, would the volume of gas A measured at the 30th minute be higher, the same, or lower than that shown in the graph at the 30th minute? Explain your answer.

Jennifer placed a plant in blue-coloured water as shown below. After one day, she observed that part A had turned blue. (a) Explain why part A turned blue. Jennifer conducted another experiment using the same set-up. She cut out a small ring of the outer layer of the stem as shown in the diagram below. After a few days, Jennifer observed swelling only above the cut out layer of the stem as shown above. (b) Based on the diagram provided, explain why there was swelling above the ring of the stem.

Azmi placed a beaker of ice on the table. (a) Explain why water droplets were observed on the outer surface of the beaker after a few minutes. Azmi wanted to find out if the presence of substance M would affect the melting rate of ice. He used the set-ups shown below for his experiment. He placed set-up S in his classroom and set-up T in the open field. (b) Explain why putting the set-ups in different locations does not ensure a fair test. His friend, Caleb, performed the same experiment with both set-ups, S and T, in the classroom. The graph below shows the results. (c) Using the graph, state the effect of substance M on the rate of melting of the ice. (d) Using the graph, explain how you arrived at your answer in (c).

Harry conducted two different activities, walking and running. He measured his heart rate for each activity. He only recorded his results for walking in the graph below. (a) Draw a bar graph to represent Harry's heart rate when he was running. (b) Explain your answer in (a). Before the run, Harry ate a banana to help him complete the run. (c) State how the digestive system works with the circulatory system to allow Harry to complete the run.