Pearson Edexcel Level 3 GCE

ing your candidate information Candidate surname Other names Centre Number Candidate Number Pearson Edexcel Level 3 GCE Thursday 22 May 2025 reference 8BN0/02 Biology A (Salters Nuffield) Total Marks Instructions Fill in the boxes at the top of this page with your name, centre number and candidate number. Show your working in any calculation questions and include units in your answer where appropriate. Answer the questions in the spaces provided – there may be more space than you need. Information 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. • Check your answers if you have time at the end. Turn over P78688A ©2025 Pearson Education Ltd. Y:1/1/1/1/ Answer ALL questions. Write your answers in the spaces provided. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 All living organisms are made of cells. (a) The image shows an electronmicrograph of an organelle found only in eukaryotic cells. A B (Source: © Omikron/SCIENCE PHOTO LIBRARY) magnification ×44 000 (i) This organelle is not found in prokaryotic cells. Explain why this type of organelle is present only in eukaryotic cells and not in prokaryotic cells. 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(ii) Calculate the width of this organelle from A to B, as shown in the image. Give your answer in micrometres (µm) to two significant figures. (2) . µm (b) The image shows an electronmicrograph of part of a eukaryotic cell. E F G (Source: © Don Fawcett/SCIENCE PHOTO LIBRARY) (i) Which row in the table identifies structures E, F and G? A B C D (ii) Which row of the table shows the processes that involve structures E and F? A B C D (1) (1) (Total for Question 1 = 6 marks) 2 The photograph shows a Pyrenean desman, a mammal that is endemic to fast‑flowing mountain streams in Spain. (Source: © BIOSPHOTO/Alamy Stock Photo) (a) Which of the following is the correct definition of the term endemic? A found in only one type of habitat B found in only one geographical location C lives in many different locations D occupies a single niche (b) The Pyrenean desman has a number of adaptations that allow it to survive in its habitat: (1) 1. it feeds on insects 2. it has webbed feet to enable it to swim 3. it has a long snout that it can use to find food in between rocks 4. it has nostrils on the upper surface of the snout 5. it is nocturnal – feeding at night. (i) Which adaptations from the list are all anatomical adaptations? A 1, 2 and 3 (1) B 1, 3 and 4 C 2, 3 and 4 D 3, 4 and 5 (ii) The Pyrenean desman is thought to have evolved from a land‑living animal similar to a mole. Explain how the Pyrenean desman could have evolved by natural selection from a land‑living animal similar to a mole. 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(Total for Question 2 = 7 marks) 3 The leaves of the pineapple plant provide long fibres that can be used in the production of textiles. The photograph shows fibres being extracted from pineapple leaves. (Source: © Jahangir Alam Onuchcha/Shutterstock) (a) Leaves are organs that contain tissues. Give one difference between an organ and a tissue. 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(b) (i) The fibres extracted from pineapple leaves contain cellulose and lignin. Which of the following tissues contain lignin? A only phloem B only sclerenchyma C only xylem D sclerenchyma and xylem