P5 Science CA1 2021 — Rosyth

Jimmy prepared four set-ups, A, B, C and D, using similar plants as shown in the diagram below. Which two set-ups should Jimmy choose to find out if plant needs water to survive?

The chart below shows the similarities and differences among three living things, X, Y and Z. What do X, Y and Z represent?

Which one of the following organ systems is matched correctly to its parts?

Organ A and organ B are connected to each other in the human digestive system. The diagram below shows only the absorption of water from the digestive system into the circulatory system. Based on the information given, organ A is the ____.

Some men were trapped in a lift. Which one of the following graphs shows the changes in the amount of gases in the room?

The diagram below shows the flow of blood in certain parts of the human body. Which one of the following shows the amount of digested food and carbon dioxide in blood at A and B respectively when a person has just completely digested his food?

Which of the following substance(s) is/are not transported by the stem in a plant? A: food, B: water, C: mineral salts, D: carbon dioxide

Ally removed a layer of bark from a healthy plant at two positions, X and Y. The layers removed are of different depths. The two positions are as shown below. Which one of the following shows the tube/tubes removed at the two positions, X and Y, and the condition of the leaves, A and B, after a week?

The diagram below shows a young seedling. In which direction is food and water being transported at X respectively?

Siew Fen saw a lady putting one paper bag inside another paper bag as shown below before putting her things inside. Which property of the paper bag is she trying to increase?

The diagram below shows an electrical system made of different objects. Which is the energy source of the electrical system above?

The diagram below shows four bulbs A, B, C, D and two batteries connected in a circuit. When one of the bulbs fused, the other three bulbs will remain lit. Which bulb is fused?

All the bulbs and batteries in the three circuits below are identical and are in working conditions. A, B, C and D are materials which are either electrical conductor or insulator. Which of the following materials is/are definitely an electrical insulator?

Ziming set up two identical bulbs in his toy house. Bulb X is in Room 1 and Bulb Z is in Room 2. The brightness of each room is the same. The two rooms are separated by a wall as shown below. He wanted Room 2 to be brighter than Room 1. What should he do?

Liquid X is similar to the digestive juice found in the stomach. Amin prepared the two set-ups as shown below using similar-sized foods, A and B. He was investigating the rate of digestion for foods, A and B. He recorded the results of his experiment after an hour. He concluded that food A digested faster than food B in liquid X. (a) What would be the evidence to support the above conclusion? [2] (b) Amin wanted to find out what is the best temperature for digesting food A in liquid X. He prepared three experimental set-ups with liquid X at 20°C, 30°C and 40°C respectively. Using the results, he concluded that the best temperature for food A to be digested is at 30°C. His teacher asked him to prepare another set-up with liquid X at 37°C. Explain why that set-up is needed. [1]

Sam carried out an experiment to find out how the number of leaves on a plant affects the rate of absorption of water by the plant. He placed two similar plants in identical beakers, each containing the same amount of water as shown in the diagram below. He then placed the two set-ups next to a window for five days. He recorded part of his experimental results in the table below (Day 0: Set-up A 500 ml, Set-up B 500 ml; Day 2: A 450, B 490; Day 4: A 400, B 470). (a) State the changed variable in this experiment. [1] (b) What can Sam do to make the results more reliable? [1] (c) The picture below shows a tree that has shed its leaves during the dry season. Using the results, explain how shedding its leaves would help the plant. [2]

David hung a magnet A, 30 cm away from a magnetic material B. (a) He observed that magnet A and the magnetic material B were not attracted to each other. Explain why. [1] (b) Then he hung object X in between magnet A and magnetic material B as shown below. If object X is a magnet hung in between A and B, what would possibly happen to A and B? Draw in the box given below to show one possible result. (Label all the magnetic poles in your drawing.) [2]

Ben wants to set up a circuit to light up his toy building as shown below using identical bulbs and batteries. Study the circuit above and answer the following questions. State if statements 1 and 2 are true or false and give the reasons. Statement 1: When the wire is at X, bulb A will light up. (Tick: True/False; Reason for your choice.) Statement 2: When the wire is at Y, bulb B will light up. (Tick: True/False; Reason for your choice.) [3]

Mary set up a circuit using two bulbs and a battery. She wants the following condition to be met: There are two pathways for the electrical current to flow. (a) Complete the circuit below. [2] (b) State one disadvantage of the above circuit. [1] (c) Suggest how the two bulbs can be controlled independently. [1]

Ruth sets up an electric circuit using a bulb and two batteries as shown below. She wants to find out how the number of bulbs arranged in series will affect the brightness of each bulb. (a) To ensure a fair test, state one variable she must keep constant. [1] (b) The graph below shows the relationship between the number of bulbs arranged in series in the circuit and the brightness of the bulbs. From the graph above, state the relationship between the number of bulbs arranged in series and the brightness of the bulbs. [1] (c) Ruth carried out the experiment in a dark room. Explain how carrying out the experiment in a dark room helped to make the experiment accurate. [1] (d) Ruth saw a notice as shown below — 'Do not charge your mobile phone overnight.' Explain the reason for the above notice. [2]