Biology > GCSE MARK SCHEME > Pearson Edexcel International GCSE in Human Biology (4HB1) Paper 01 Mark Scheme (Results) January (All)

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Pearson Edexcel International GCSE in Human Biology (4HB1) Paper 01 Mark Scheme (Results) January 2022. Graded A+

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Question number Answer Notes Marks 1 (a) (i) B; (pulmonary artery) 1 A it is not the aorta C it is not the pulmonary vein D it is not the vena cava (ii) A; (aorta) B it is not the pulmonary art... ery C it is not the pulmonary vein D it is not the vena cava 1 (iii) in at top left and out through vessel; in at top right and out through vessel; 2 (iv) valves; prevent blood flowing other way/backflow; 2 (b) (i) chamber width in cm P 1.0; Q 0.2; R 0.2; 1 correct = 1 mark 2 correct = 2 marks 3/4 correct = 3 marks S 1.5; 3 (ii) An answer that makes reference to three of the following:  The width corresponds to the amount of muscle;  S pumps blood furthest distance/whole body;  P pumps blood to lungs/short distance;  Q/R only receives blood/doesn't have to pump it very far/to ventricles; 3 Total : 12 marks https://britishstudentroom-b430a.web.app/Question number Answer Notes Marks 2 (a) (i)  sample placed in test tube;  Benedict's solution added;  heat in a water bath;  blue to brick red if glucose present/stays blue if absent; 4 (ii)  sample from tubing placed in test tube/on spotting tile;  iodine solution added;  brown to blue-black if present/stays brown if absent; 3 (iii)  remove any starch/glucose;  spilt when putting solution into tubing;  to avoid contamination/doesn't affect result/investigation/ensure results are valid; 3 (b)  water in tube, positive for glucose but negative for starch  contents of tubing should test positive for starch and glucose;  Visking tubing has pores/partially permeable;  size( of pores) allows glucose to pass;  starch can't pass; [Show More]

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Pearson Edexcel International GCSE in Human Biology (4HBI) Paper 01. Mark Scheme (Provisional) Summer 2021. Graded A+ Pearson Edexcel International GCSE in Human Biology (4HBI) Paper 02 Mark Scheme (...

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