P6 Science SA1 2025 — Red Swastika

The diagram below shows the presence of some traits in Caleb's family tree. Which of the following statements is true of the above family tree? (1) D did not inherit curly hair. (2) C inherited curly hair from B. (3) Caleb passed on curly hair to A. (4) Curly hair can only be inherited by males in the family.

Ariana conducted an experiment on substances E and F using the set-up as shown below, at room temperature of 30°C. The table below shows the freezing and boiling points of substances E and F. [Table: Substance E — Freezing point 5°C, Boiling point 24°C; Substance F — Freezing point 20°C, Boiling point 40°C.] He used the pump to pump in 50 cm³ of substance E and 50 cm³ of substance F. What is the final volume of gas in the container? (1) 50 cm³ (2) 100 cm³ (3) 150 cm³ (4) 300 cm³

Study the diagram carefully. Based on the diagram above, which human body systems do G, H and J represent? [Options table — G / H / J: (1) respiratory / digestive / circulatory; (2) respiratory / circulatory / digestive; (3) circulatory / respiratory / digestive; (4) digestive / respiratory / circulatory.]

The diagram below shows a plant growing in the school garden. Which of the following statement(s) is/are correct? A: The plant can make food. B: It is a non-flowering plant. C: The plant has a weak stem. (1) A and B only (2) A and C only (3) B and C only (4) All of the above

Study the leaf cell shown below. Which parts are found in a root hair cell and cheek cell? [Options table — root hair cell / cheek cell: (1) A,B,C / A,B,C,E; (2) B,C,E / A,B,E; (3) A,C,D,E / B,C,D; (4) B,C,D,E / C,D,E.]

Tate made a circuit tester where X and Y are the ends of two crocodile clips. He also made a circuit card where he used paper clips to label points M, N, P, Q and R. He then connected a wire to some of the points on the circuit card as shown below. Which two points in the circuit card should be connected to points X and Y to light up the bulb? (1) P and Q (2) M and N (3) P and R (4) N and Q

The diagram below shows a habitat in the sea. Which of the following statements is true? (1) Plant E is not an organism. (2) There are four populations in this habitat. (3) Plant E and animal D form two populations. (4) Animals A, B, C and D forms four communities.

Nora found some caterpillars eating up the vegetables in her farm. She bought some chickens and released them into the farm to control the population of the caterpillars. She observed the change in the population of the vegetables and the caterpillars from January to December as shown below. Which of the following could be the possible reason(s) for the change in population size of the caterpillars from June to December? A: The vegetables were infected with a disease. B: The chicken population was infected with a disease. C: Other plant-eating organisms were found on the farm. D: Some wolves came from elsewhere to live in the forest next to the farm. (1) A only (2) B only (3) A and C only (4) B and D only

The diagram below shows Shawn throwing a paper plane into the air. Which of the following graphs shows the correct change in the gravitational potential energy (GPE) as the paper plane moves from position P to R? (1) GPE rises from P to Q then falls steeply to R (peak at Q). (2) GPE rises steadily from P to R (low at P, high at R). (3) GPE falls steadily from P to R (high at P, low at R). (4) GPE falls from P to a minimum at Q then rises to R (V-shape).

The two graphs below provide some information about a pond community. Graph A shows how light intensity changes with the depth of the pond. Graph B shows how the number of submerged aquatic plants found changes with the amount of light in the pond. (a) Define what is a community. (1m) (b) Based on the graphs above, what is the relationship between the depth of the pond and the number of aquatic plants found? Explain your answer. (2m) (c) The diagram below shows an incomplete food web involving a group of organisms living in the pond. [Figure: incomplete food web with circles. Known nodes: 'Fish' and 'Plant'. Plant has arrows going to fish, to G (bottom), and to an empty circle. Fish has arrows going to an empty circle (top) and from D (right). G has arrows going to an empty circle (left) which then points to another empty circle (far left).] Use the information given to complete the food web above. Fill in the blanks with B, C, E and H. (2m) • B feeds on both plants and fishes. • C feeds on E only. • H feeds on fishes only.

Derion carried out an experiment using some water snails and hydrilla plants. Each container contained the same volume of water and the same amount of dissolved carbon dioxide. A stopper was placed at the opening of each container. Set-ups J and K were left under the sun while Set-ups L and M were placed in a black box for 2 hours. At the end of the experiment, Derion measured the amount of carbon dioxide in each set-up again. He found that there was more carbon dioxide in Set-up J than Set-up K. (a) Explain the difference in the amount of carbon dioxide for J and K. (1m) (b) Derion's friend, Carissa, commented that the amount of carbon dioxide at the end of the experiment in Set-up K is the same as that in Set-up M. Was Carissa correct? Explain your answer. (2m)

Kingsley tried to flip his empty bottle so that it could land on the table standing upright in Position S. He held the bottle at Position Q and then swung it upwards and forward before releasing it. (a) State the energy conversion of the bottle as it moved from Position Q to S. (1m) [Figure: four boxes connected as box → box → box + box, labelled below as 'position Q', 'position R' and 'position S'.] (b) Kingsley repeats the action with a fully filled bottle. Will the maximum height of position R be higher, lower or the same, assuming he uses the same amount of force to swing the bottle at Q? (1m) (c) Using energy conversion, explain your answer for part (b). (2m)