P3 Science SA2 2020 — Ai Tong

The pictures below show an animal before and after one year. The above shows that the animal is a living thing because it can ____________.

The table below shows the characteristics of organisms, W, X, Y and Z. A tick (✓) shows the organism has the characteristic. Which of the organisms, W, X, Y or Z, is most likely a plant?

Janet found animal Q as shown in the diagram below. Which of the following characteristics about animal Q tells Janet that it is not an insect?

Beatrice wants to classify the following animals into two groups, Group A and Group B. Which of the following is a possible heading for the two groups?

The diagram below shows the life cycle of living thing P. Based only on the life cycle above, which of the following statements is true?

The following pictures show the different stages in the life cycle of a plant. At which stage(s) of the life cycle does the plant make its own food?

The picture below shows how the leaves of a plant may grow. It was observed that the leaves of most plants grow in a way that do not overlap each other too much. Which of the following best explains the reason for this observation?

There was heavy rain and strong winds on a stormy day. A tree fell onto a house as shown below. Which of the following best explains why the tree fell?

Kelly conducted an experiment with three similar plants, A, B and C. She cut off all the leaves from plant A and only some leaves from plant B. No leaves were cut from plant C. Kelly then placed each plant in a container with 300 ml of water. The plants were placed at the same location. A layer of oil was added to prevent water loss to the surrounding air. Kelly recorded the amount of water left in each container the next day. The aim of the experiment is to find out if the ____________.

The following objects are grouped according to the materials they are made from. In which group should a "balloon" belong to?

Four children, Heidi, Ian, Jay and Kelly, visited a playroom at the Science Centre. There are four walls built with materials A, B, C and D, in the playroom. The children stood behind the walls as shown in the diagram below. Which of the following statements is true?

Ken wanted to make a swing for his son. He tested out four different materials J, K, L and M to make part T of the swing as shown in the diagram below. In the experiment, Ken put weights on the seat of the swing and recorded the total mass Part T could hold before it broke in the table below. Based on the information in the table, which material should Ken use if his son has a weight of 23kg?

Gary tied a string to a bar magnet as shown below. He pushed the magnet gently and it came to rest after some time. In which direction would the bar magnet point when at rest?

Aaron found two objects Q and R, in a box. He placed one end of a bar magnet near each object and recorded his observations in the table below. Based on his observation, which of the following correctly shows what objects Q and R could be?

Study the arrangement of the three magnets below. They are attracted to each other. Three students made the following statements based on the arrangement above. Jane: C will repel E. Kate: A will attract F. Louis: F will attract D. Which of the statement(s) below is/are correct?

Study the classification chart below. (a) Based on the classification chart, state the characteristics of organism H. (b) The picture below shows organism A. Based on the classification chart, write down one difference between organism A and organism E.

Joe wanted to find out if the amount of water will affect the amount of mould growing on bread. He added different drops of water to four similar pieces of bread, W, X, Y and Z. He placed all the four pieces of bread in a cupboard for five days. He recorded his observations after five days in the table below. (a) From the results above, how does the amount of water affect the growth of bread mould? Complete the following sentence by circling the correct answer in the brackets. The ( more / less ) the amount of water on the bread, the ( more / less ) the mould will grow on the bread. (b) Joe wanted to conduct another experiment to find out if warmth is needed for bread mould to grow. Which of the following variable(s) must Joe keep constant in order for the experiment to be a fair test? Put a tick (✓) in the correct box(es). (c) Which group of living things does the bread mould belong to?

The diagrams below show the stages in the life cycle of a beetle. (a) Arrange the stages P, Q, R and S to show the life cycle of the beetle. (b) The grasshopper is also an insect, just like the beetle. State one difference between the life cycle of a beetle and the life cycle of a grasshopper.

In an experiment, Lydia put three similar seeds between two types of soil, dry and moist, in a container as shown below. Lydia then placed the container in her classroom. The next day, the seeds germinated. In which direction would the roots of the seeds grow towards? Explain your answer.

Arul observed Plant G growing in his garden. (a) Plant G grows on a wooden stick, which is a support for the plant to grow. What does this show about the stem of Plant G? (b) Explain how growing on the wooden stick will help the leaves of Plant G. (c) Part E is the fruit of the plant. When Arul opened up the fruit, he saw some seeds inside it. How are the seeds useful to the plant?

Study the flowchart below. (a) Based on the flowchart, write down one similarity between objects G and H. (b) Using the information from the flowchart, write the letters E, F, G or H that best describe the objects below.

Raju set up an experiment to find out how much water three pieces of fabric, A, B and C can absorb. All the fabric are of the same size. He dipped one end of each piece of fabric into a container of blue coloured water as shown below. The distance that the blue coloured water travelled up each fabric after five minutes is recorded in the table below. (a) Arrange the fabrics in order of their absorbency, from the least absorbent to the most absorbent fabric in the boxes provided. (b) Raju had an umbrella and he cut a piece of fabric T as shown below. Raju then dipped one end of the fabric T into the container with blue coloured water. (i) What is the distance that the blue coloured water would most likely to travel up the fabric? ____ cm (ii) Explain your answer in (i).

Emily labelled four parts, J, K, L and M on a bar magnet, A. She placed the bar magnet into a box of pins and noticed that the pins were attracted to the magnet. She recorded her observation in the bar graph shown below. (a) Based on the information, which two parts represent the poles of the bar magnet? (b) Explain your answer in (a). (c) Emily brought one end of object G near the bar magnet A and they attracted each other as shown below. She concluded that object G is also a magnet. However, her brother, Jacky, said that what Emily had observed could not prove that object G is a magnet. Suggest what Emily could do to prove that object G is a magnet.