Biology > GCSE MARK SCHEME > Pearson Edexcel International GCSE in Human Biology (4HB1) Paper 02 Mark Scheme (Results) January 2 (All)

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Pearson Edexcel International GCSE in Human Biology (4HB1) Paper 02 Mark Scheme (Results) January 2022. Graded A+

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Question number Answer Notes Marks 1 (a) (i)  first convoluted tubule;  loop of Henlé;  second convoluted tubule; diagram only, no labels required 3 (ii) 44mm; ecf from mp1 max 2 ma... rks 44 ÷ 650; = 0.068mm; Allow 0.0676 3 (iii)  protein;  red/white blood cells/platelets; 2 (iv) glucose; 1 (b) (i) Any 2 from:  same person;  same activity levels;  same volume of water;  same food eaten; 2 (ii) 2 710 ÷ 4; = 178 cm3 per hour; Allow 1 mark if division by 4 is shown Allow 177.5  less urine production/lower urine loss on day two; Allow reverse argument for all marking points (iii)  more ADH secreted on second day;  more water reabsorbed;  more water lost by sweating; 3 Total 16 marks https://britishstudentroom-b430a.web.app/Total 14 marks Question number Answer Notes Marks 2 (a) (i) an answer that makes reference to three of the following:  warms air;  moistens air;  layer of (sticky) mucus;  removes/traps, pathogens/bacteria/microorganisms/dust / dirt (from entering lungs);  reference to 1st line of defence; Mp3 must be linked to mp4 for mark 3 (ii)  prevents collapse;  to allow air to flow freely (to lungs/alveoli);  allows neck to bend; 2 (iii) B; (bronchi) 1 (b) D; (medulla oblongata) 1 (c) 17 × 0.50 = 8.5 dm3; 4 × 8.5; = 0.34 dm3; 3 (d)  reduced oxygen uptake by haemoglobin/forms carboxyhaemoglobin;  less oxygen to developing fetus;  lower rate of respiration/less energy released (by fetus);  less growth/lower birth mass; [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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