Pearson Edexcel Mark Scheme (Results) Summer 2022 Pearson Edexcel GCSE In Combined Science (1SC0) Paper 2BH Mark Scheme (Results) Summer 2022 Pearson Edexcel GCSE In Combined Science (1SC0) Paper 2BH Edexcel and BTEC Qualifications

Pearson Edexcel Mark Scheme (Results) Summer 2022 Pearson Edexcel GCSE In Combined Science (1SC0) Paper 2BH Mark Scheme (Results) Summer 2022 Pearson Edexcel GCSE In Combined Science (1SC0) Paper 2BH Edexcel and BTEC Qualifications Edexcel and BTEC qualifications are awarded by Pearson, the UK’s largest awarding body. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. For further information visit our qualifications websites at or . Alternatively, you can get in touch with us using the details on our contact us page at Pearson: helping people progress, everywhere Pearson aspires to be the world’s leading learning company. Our aim is to help everyone progress in their lives through education. We believe in every kind of learning, for all kinds of people, wherever they are in the world. We’ve been involved in education for over 150 years, and by working across 70 countries, in 100 languages, we have built an international reputation for our commitment to high standards and raising achievement through innovation in education. Find out more about how we can help you and your students at: Summer 2022 Publications Code 1SC0_2BH_2206_MS All the material in this publication is copyright © Pearson Education Ltd 2022 General Marking Guidance • All candidates must receive the same treatment. Examiners must mark the first candidate in exactly the same way as they mark the last. • Mark schemes should be applied positively. Candidates must be rewarded for what they have shown they can do rather than penalised for omissions. • Examiners should mark according to the mark scheme not according to their perception of where the grade boundaries may lie. • There is no ceiling on achievement. All marks on the mark scheme should be used appropriately. • All the marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved, i.e. if the answer matches the mark scheme. Examiners should also be prepared to award zero marks if the candidate’s response is not worthy of credit according to the mark scheme. • Where some judgement is required, mark schemes will provide the principles by which marks will be awarded and exemplification may be limited. • When examiners are in doubt regarding the application of the mark scheme to a candidate’s response, the team leader must be consulted. • Crossed out work should be marked UNLESS the candidate has replaced it with an alternative response. Mark schemes have been developed so that the rubrics of each mark scheme reflects the characteristics of the skills within the AO being targeted and the requirements of the command word. So for example the command word ‘Explain’ requires an identification of a point and then reasoning/justification of the point. Explain questions can be asked across all AOs. The distinction comes whether the identification is via a judgment made to reach a conclusion, or, making a point through application of knowledge to reason/justify the point made through application of understanding. It is the combination and linkage of the marking points that is needed to gain full marks. When marking questions with a ‘describe’ or ‘explain’ command word, the detailed marking guidance below should be consulted to ensure consistency of marking. Assessment Objective Command Word Strand Element Describe Explain AO1 An answer that combines the marking points to provide a logical description An explanation that links identification of a point with reasoning/justification(s) as required AO2 An answer that combines the marking points to provide a logical description, showing application of knowledge and understanding An explanation that links identification of a point (by applying knowledge) with reasoning/justification (application of understanding) AO3 1a and 1b An answer that combines points of interpretation/evaluation to provide a logical description AO3 2a and 2b An explanation that combines identification via a judgment to reach a conclusion via justification/reasoning AO3 3a An answer that combines the marking points to provide a logical description of the plan/method/experiment AO3 3b An explanation that combines identifying an improvement of the experimental procedure with a linked justification/reasoning Question Number Answer Additional Guidance Mark 1(a)(ii) An answer including: • thick walls (1) • continuous / hollow tubes / no end walls (1) accept no cytoplasm accept made of lignin / made of dead cells (1) (2) AO2 1 Question Number Answer Mark 1(a)(i) B mitochondria The only correct answer is B A is not correct because vacuoles do not release energy C is not correct because nuclei do not release energy D is not correct because ribosomes do not release energy (1) AO1 1 Question Number Answer Mark 1(b)(i) An explanation including three from: • fan causes air to move / creates wind / increased air flow (1) • water (vapour) removed (from around leaf) (1) • increased {rate of diffusion / evaporation / transpiration} (of water vapour from leaf) (1) • causing the plant to take up more water (1) (3) AO2 2 Question Number Answer Additional Guidance Mark 1(b)(ii) to compare (the effect) / as a control accept to get a baseline measurement (1) AO2 2 Question Number Answer Additional guidance Mark 1(b)(iii) 68 – 52 / 16 (1) (16 ÷ 2) 8 (mm3 per minute) award full marks for correct answer with no working e.c.f. for incorrect graph readings for 1 mark (2) AO2 1 (Total for question 1 = 9 marks) Question Number Answer Additional guidance Mark 2(a)(i) An explanation linking: • artery has {thicker / more muscular} wall (1) • because of the (blood) pressure (higher in artery than in vein) (1) accept prevent the artery bursting / maintain blood pressure (2) AO2 1 Question Number Answer Mark 2(a)(ii) valve / valves (1) AO1 1 Question Number Answer Additional guidance Mark 2(b)(i) 5 x 60 = 300 (1) OR 60 ÷ 100 = 0.6 (1) (300 ÷ 100) = 3 (dm3 ) award full marks for correct answer with no working accept other correct methods of calculation which is a percentage calculation (2) AO2 1 Question Number Answer Mark 2(b)(ii) An explanation linking: • because (during exercise muscles) require more {oxygen / glucose} (1) • for respiration / to release energy (1) OR • to remove more carbon dioxide / to remove lactic acid (1) • as this is a product of respiration (1) (2) AO2 1 (Total for question 2 = 7 marks) Question Number Answer Mark 3 (a)(i) D mutualism The only correct answer is D A is not correct because it is not parasitism B is not correct because it is not indigenous C is not correct because it is not biodiversity (1) AO1 Question Number Answer Additional Guidance Mark 3(a)(ii) 7500 (µm) accept 7.5 x 103 reject 7.5 x 10-3 (1) AO1 1 Question Number Answer Additional Guidance Mark 3(b)(i) X – decomposers Y – nitrifying (bacteria) accept fungi / decomposing bacteria accept named nitrifying bacteria reject denitrifying bacteria / nitrogen-fixing bacteria (2) AO1 1 Question Number Answer Additional guidance Mark 3(b)(ii) An explanation linking three from: • leguminous crops planted (1) • that have nitrogen-fixing bacteria (1) • in root (nodules) (1) • which fix nitrogen (gas) (1) accept named leguminous crops accept use nitrogen from the air / use atmospheric nitrogen / make ammonia ignore produce nitrates (3) AO1 Question Number Answer Additional Guidance Mark 3(b)(iii) An explanation linking: • nitrates are needed to make {protein / amino acids} (1) • which are needed for growth (1) accept for DNA / genetic material (2) AO1 (Total marks for question 3 = 9 marks) Question Number Answer Additional Guidance Mark 4(a)(i) An explanation linking: • inhibits {FSH / LH} (1) • which prevents {maturation of a follicle / ovulation} (1) ignore prevents production of eggs accept thickens cervical mucus (1) accept thickens cervical mucus blocks the sperm / stops them reaching the egg for 2 marks (2) AO2 Question Number Answer Additional guidance Mark 4(a)(ii) doesn’t prevent STI Accept STDs for STIs Accept named STIs accept still a chance of pregnancy (1) AO1 Question Number Answer Additional Guidance Mark 4(b) An explanation linking: • blood glucose levels are not regulated / high (1) • because cells are resistant to insulin (1) • (so the liver) does not convert glucose to glycogen (1) accept blood sugar levels accept there is insulin resistance / unresponsive to insulin reject immune accept hyperglycaemia / symptoms of hyperglycaemia (1) (3) AO1 Question Number Answer Additional Guidance Mark 4(c) An answer including four from: • {TSH / thyroxine} levels are higher than normal (1) • TSH stimulates the thyroid gland / TSH stimulates the release of thyroxine (1) • increases metabolic rate (1) • {red blood cells / glucose} are within the normal range (1) • suggesting oxygen is carried as normal (1) • the symptoms are not due to diabetes (1) accept the hormones levels are high / above average accept digests / breaks down food faster accept hyperthyroidism / overactive thyroid accept RBC / glucose are not high accept is not anaemic (4) AO3 1a, 1b, 2a, 2b (Total for question 4 = 10 marks) Question Number Answer Additional Guidance Mark 5(a)(i) multiply the number of beats (in 10 seconds) by 6 accept times by six (1) AO2 Question Number Answer Additional Guidance Mark 5(a)(ii) Any two from: • use a heart rate monitor / electronic device (to measure HR) (1) • take readings more frequently than 5 minutes (1) • record the pulse for longer than 10 seconds (1) • take repeat readings / calculate a mean (1) ignore use a stopwatch accept rep