Edexcel as level biology question paper 2 ju ne 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 Thursday 25 May 2023 Morning (Time: 1 hour 30 minutes) Paper reference 8BN0/02 Total Marks Biology A (Salters Nuffield) Advanced Subsidiary PAPER 2: Development, Plants and the Environment You must have: Calculator, HB pencil, ruler 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 80. • You may use a scientific calculator. • The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. • 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.*P71923A0228* 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. 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 Plant cells and animal cells have similarities and differences. (a) Which of the following groups of organelles are found in both animal and plant cells? (1) A amyloplasts, chloroplasts and Golgi apparatus B amyloplasts, Golgi apparatus and rough endoplasmic reticulum C cell wall, Golgi apparatus and mitochondria D Golgi apparatus, mitochondria and rough endoplasmic reticulum (b) Plant and animal cells both undergo the process of mitosis. Which of the following happens during the process of mitosis? (1) A the cell divides B the cell membrane breaks down C the nucleus divides D the organelles multiply *P71923A0328* Turn over 3 DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (c) Mitotic division in the common sunflower, Helianthus annuus, was investigated. Several samples of 1 000 root tip cells were examined and the stage of the cell cycle recorded for each cell. The photograph shows a single root tip cell. © STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY (i) Which stage of mitosis is shown in this cell? (1) A anaphase B metaphase C prophase D telophase*P71923A0428* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 4  (ii) The results of five root tip samples are shown in the table. Sample Number of cells in each stage of the cell cycle Interphase Prophase Metaphase Anaphase Telophase 2 2 2 2 0 Mean Which is the approximate ratio of the number of cells not in mitosis to the number of cells in mitosis? (1) A 9 : 1 B 9 : 2 C 7 : 1 D 7 : 2 *P71923A0528* Turn over 5 DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (iii) Describe what happens in the cell during the telophase stage of mitosis. 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(Total for Question 1 = 8 marks)*P71923A0628* DO NOT