Edexcel a level biology question paper 3 june 2023 salters Nuffield + mark scheme

Please check the examination details below before entering your candidate information Candidate surname Other names Centre Number Candidate Number Pearson Edexcel Level 3 GCE Wednesday 21 June 2023 Morning (Time: 2 hours) Paper reference 9BN0/03 Total Marks Biology A (Salters Nuffield) Advanced PAPER 3: General and Practical Applications in Biology You must have: Ruler, HB pencil, scientific calculator and a copy of the scientific article adapted from Scientific American (enclosed) Instructions • Use black ink or ball-point pen. • Fill in the boxes at the top of this page with your name, centre number and candidate number. • Answer all questions. • Show all your working out in calculations and include units where appropriate. • Answer the questions in the spaces provided – there may be more space than you need. Information • The total mark for this paper is 100. • The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. • You may use a scientific calculator. • In questions marked with an asterisk (*), marks will be awarded for your ability to structure your answer logically, showing how the points that you make are related or follow on from each other where appropriate. Advice • Read each question carefully before you start to answer it. • Try to answer every question. • Check your answers if you have time at the end.*P71908A0232* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 2  Answer ALL questions. Write your answers in the spaces provided. 1 The heart pumps blood around the circulation system. (a) Explain why many animals need a heart and circulation system. 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(b) If the heart of an animal is removed from its body, the heart will continue to beat for a period of time. The left atrium stops contracting if it is separated from the rest of the heart. However, the right atrium and the rest of the heart will continue to beat. Eventually, the right atrium and the rest of the heart will also stop beating. (i) Give a reason why the heart will continue to beat after being removed from the body. (1) .................................................................................................................................................................................................................................................................................... (ii) Explain why the left atrium stops beating when it is separated from the right atrium. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... *P71908A0332* Turn over 3 DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (iii) Explain why the right atrium and the rest of the heart eventually stop beating. 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(Total for Question 1 = 7 marks)*P71908A0432* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 4  2 White blood cells are involved in the non-specific and specific immune responses. Neutrophils and monocytes are two types of white blood cell. The table provides information about the neutrophils and monocytes of one individual. (a) Complete the table to show the volume of each neutrophil. Volume of a sphere V = 4 3 πr3 (2) Information Neutrophil Monocyte Number of cells per mm3 of blood 3000 400 Diameter of the cell /µm 10 20 Volume of each cell / µm3 314 *P71908A0532* Turn over 5 DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (b) The table shows some properties of neutrophils and monocytes. Activated monocytes are called macrophages. Property Neutrophil Monocyte Material taken up by phagocytosis Bacteria and fungi Dead cell debris, bacteria and fungi Antigen presentation No Yes Production of cytokines No Yes (i) State what is meant by the term phagocytosis. (1) ..................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ........................................................................................