GCSE Biology B. Mark Scheme for June Unit B731/02: Modules B1, B2, B3 (Higher Tier) General Certificate of Secondary Education
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1 GCSE Biology B Unit B731/02: Modules B1, B2, B3 (Higher Tier) General Certificate of Secondary Education Mark Scheme for June 2017 Oxford Cambridge and RSA Examinations
2 OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to meet the needs of candidates of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas, GCSEs, Cambridge Nationals, Cambridge Technicals, Functional Skills, Key Skills, Entry Level qualifications, NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration and secretarial skills. It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support, which keep pace with the changing needs of today s society. This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which marks were awarded by examiners. It does not indicate the details of the discussions which took place at an examiners meeting before marking commenced. All examiners are instructed that alternative correct answers and unexpected approaches in candidates scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes should be read in conjunction with the published question papers and the report on the examination. OCR will not enter into any discussion or correspondence in connection with this mark scheme. OCR 2017
3 B731/02 Mark Scheme June 2017 Annotations used in scoris Annotation Meaning correct response incorrect response benefit of the doubt benefit of the doubt not given error carried forward information omitted ignore reject contradiction Abbreviations, annotations and conventions used in the detailed Mark Scheme. / = alternative and acceptable answers for the same marking point (1) = separates marking points allow = answers that can be accepted not = answers which are not worthy of credit reject = answers which are not worthy of credit ignore = statements which are irrelevant ( ) = words which are not essential to gain credit = underlined words must be present in answer to score a mark (although not correctly spelt unless otherwise stated) ecf = error carried forward AW = alternative wording ora = or reverse argument 3
4 B731/02 Mark Scheme June 2017 MARK SCHEME 1 a i 30 (g) (1) 1 ii 50 (%) (2) 2 allow ecf from (a)(i) b But if incorrect or incomplete then 15 (x 100) 30 (1) comment 1 / about being better for health overall is an opinion (1) comment 2 / difference in fat content / link between fat and heart disease are scientific facts (1) 2 must clearly link each statement to opinion or fact 5 allow comment 1 is opinion, comment 2 is fact (2) 4
5 2 [Level 3] gives an explanation of the effect of plant hormone AND correctly works out the concentration of the plant hormone solution. (5 6 marks) [Level 2] correctly works out the concentration of the plant hormone solution gives an explanation of the effect of plant hormone AND makes a partial attempt at working out the concentration of the plant hormone solution 6 This question is targeted up to grade A* Quality of written communication partly impedes communication of the science at this level. (3 4 marks) [Level 1] gives an explanation of the effect of plant hormone makes a partial attempt at working out the concentration of the plant hormone solution (1 2 marks) [Level 0] Insufficient or irrelevant science. Answer not worthy of credit. (0 marks) 6 Indicative scientific points about explaining the effect of plant hormone may include: The plant hormone causes growth /stem gets longer / stem now 25mm This is due to promoting cell elongation as concentration of hormone increases so does % change in length Indicative scientific points about the piece include: Calculation to show that this is a 5mm increase This corresponds to a 25% (increase) This must have been caused by a plant hormone concentration of 28 (parts per million) Use the L1, L2, L3 annotations in Scoris; do not use ticks. 5
6 3 a vector (1) 1 allow answer ringed, underlined or ticked more than one answer = 0 b contains a dead / weakened / harmless form of the virus (1) 3 allow pathogen / antigens not bacteria ignore small amount of the virus / weakened dose of disease ignore antitoxins / antivirals c (white blood cells) make antibodies (1) the antibodies/memory cells remain / are still present (1) a tablet / dose / medicine that does not contain any drug / medicine (1) idea to see if any effect is psychological / to see if thinking you had the drug makes a difference (1) allow on reinfection then antibodies made faster (2) 2 allow fake drug / sugar pill / inactive drug ignore pill that has no effect allow effect of drug can be compared to placebo effect / feel good factor / to prevent bias / to compare the results between the real drug and the placebo / to see if the drug works / has any effect 6 6
7 4 a 1 allow X drawn over part of iris, centre of X must be on the iris X allow only one side correctly labelled b it bends / refracts / focuses the light less (1) 2 light focused behind the retina / only light from distant objects is focused on the retina (1) c mutation (1) recessive (1) heterozygous / carriers (1) 3 6 allow can t focus on near objects as this requires more refraction ignore different 7
8 5 a agility 1 both needed in correct order for the mark flexibility (1) b idea that it only assesses the strength in one part of the body (1) 1 allow idea that it might not be dominant hand / left hand stronger / right hand is weaker BUT ignore they could be left handed/right handed allow other parts could be weaker/stronger 2 6 a to make proteins (1) 1 allow to make amino acids / DNA / chlorophyll ignore contains proteins b (decomposition) produces ammonia (1) 3 allow produces ammonium ions ammonia is converted to nitrates (1) by nitrifying bacteria (1) c i 44.4% (2) but 1.6/3.6 (1) ii India (1) allow any two from: least from nitrogen fixation (1) peas and beans contain root nodules (1) (contain) nitrogen-fixing bacteria (1) 2 44% / 44.5 % (1) 3 Australia then zero for question allow ecf for USA 9 allow least fixed / least in root nodules allow legumes contain root nodules 8
9 7 a EITHER jackrabbits have large ears (1) greater surface area (1) lose more heat (1) Jackrabbits have less fur / less fat (1) less insulation (1) lose more heat (1) 3 allow ora for the Snowshoe hare allow greater SA/V b Charles Darwin s observation Scientists observation 2 three or four correct = 2 marks two correct = 1 mark one or none correct = 0 marks survival of the fittest C competition for resources B inheritance of successful adaptations D presence of natural variation A 9
10 c [Level 3] idea of how carbon dioxide contributes to the greenhouse effect AND effect on snowshoe hares and their habitat AND linked to a reason for numbers dropping/extinction Quality of written communication does not impede communication of the science at this level. (5 6 marks) [Level 2] idea of how carbon dioxide contributes to the greenhouse effect AND effect on snowshoe hares and their habitat linked to a reason for numbers dropping/extinction Quality of written communication partly impedes communication of the science at this level. (3 4 marks) [Level 1] idea of how carbon dioxide contributes to the greenhouse effect effect on snowshoe hares and their habitat a reason for numbers dropping/extinction reference to the prediction by the scientists (1 2 marks) 6 This question is targeted up to grade C Indicative scientific points about carbon dioxide in the environment include: the greenhouse effect carbon dioxide being a greenhouse gas trapping more heat in the Earth s atmosphere / less radiated out to space global warming Indicative scientific points about the hares habitat include: loss of habitat not having as much camouflage numbers may fall below critical level - reduced population Indicative scientific points about the hares extinction include: this may result in - higher predation - lack of genetic variation - inability to find mates / lower reproduction rate Indicative scientific points about prediction by the scientists at Level 1 predictions show that less hares will survive Use the L1, L2, L3 annotations in Scoris; do not use ticks. 10
11 [Level 0] Insufficient or irrelevant science. Answer not worthy of credit. (0 marks) 11 8 a the same class, genus and species. different class, genus and species. same class and genus but different species 1 more than one answer = 0 same class but different genus and species b i an artificial (system) (1) 1 ii we use a system based on evolutionary relationships / does not allow any predictions to be made about other characteristics / does not allow any predictions to be made about evolutionary relationships (1) 1 allow DNA/genetics used to classify now allow this classification only uses one characteristic ora allow this classification cannot be based on ancestral relationships ora c Sam is correct because: any two from: 7 spotted would decrease the mean (1) an even spread would decrease the mean (1) 2 no mark for Sam Tom or Harry correct no marks 11
12 harlequins would increase the mean (1) 5 9 a i any two from: has a nucleus ora (1) has mitochondria ora (1) has chloroplasts ora (1) 2 not cell wall not cytoplasm not cap ii some genes can be lost from some cells 1 more than one answer = 0 both aerobic and anaerobic respiration can occur cells are able to differentiate and specialise organisms are able to clone themselves iii nervous or hormone system to communicate between cells / transport or circulation or cardiovascular system to carry nutrients / oxygen / blood / CO 2 around the organism 1 ignore named organs e.g. kidney / heart etc. for system allow explained alternative systems e.g. respiratory system / reproductive / digestive excretory or gas exchange system to exchange materials with the surroundings (1) 12
13 b [Level 3] includes a correct description of protein synthesis AND describes where proteins are made AND correctly links this to the change in shape of the cap over a period of time. Quality of written communication does not impede communication of the science at this level. (5 6 marks) [Level 2] includes a correct description of protein synthesis AND describes where proteins are made correctly links this to the change in shape of the cap over a period of time. Quality of written communication partly impedes communication of the science at this level. (3 4 marks) [Level 1] includes simple description of protein synthesis describes where proteins are made why it takes several weeks for the change in the cap. (1 2 marks) [Level 0] Insufficient or irrelevant science. Answer not worthy of credit. (0 marks) 6 This question is targeted up to grade A* Indicative scientific points about protein synthesis at level 2/3 may include: the order of bases codes for the order of amino acids mrna carries the code from the DNA triplet base code read for amino acid Indicative scientific points about where proteins are made may include: proteins are made on the ribosomes in the cytoplasm Indicative scientific points about why it takes several weeks for the change in the cap: time taken for the proteins in the cap to be replaced / make different proteins mrna from the old nucleus takes some time to be replaced by mrna from new nucleus Indicative scientific points about protein synthesis at level 1 may include: proteins are coded for by DNA/genes sequence of bases that code for the protein Use the L1, L2, L3 annotations in Scoris; do not use ticks
14 10 a the plants lack genetic variation (1) 2 allow decreased gene pool / genetically identical all susceptible to the same disease/ any disease/environmental change might wipe them all out (1) b some people may not want to buy / eat GM plants (1) there are concerns about their safety / some people do not think that GM is ethically right (1) allow all the strawberries will be ready at the same time (1) 2 allow some people are against GM allow some people prefer to buy non-gm allow environmental concerns allow may cause allergies / side-effects / be harmful ignore playing God 4 11 a amino acids are not proteins (1) they make up proteins (1) 2 no marks if they haven't identified amino acids not incorrect statements about collagen and insulin allow amino acids make up proteins (2) b the substrate is like a key (not the enzyme) (1) 2 allow the enzyme is like a lock (not a key) (1) the substrate fits into the enzyme s active site (not the other way round) (1) 4 allow the enzyme has an active site not the substrate (1) allow enzyme and the substrate are the wrong way round (2) 14
15 12 a i allows the animals to be compared (1) 1 ii the metabolic rate is an indication of the rate of respiration (1) 2 oxygen is needed for (aerobic) respiration (1) b i 2.5 (1) 1 BUT the more oxygen consumption the more respiration for a higher metabolic rate (2) ii the shrew needs / uses lots of oxygen (1) 3 shrew red blood cell has a large surface area to volume ratio (1) this means that it can pick up/release oxygen quickly (1) ignore references to shrew s body surface area to volume ratio ignore pick up more oxygen 7 15
16 OCR (Oxford Cambridge and RSA Examinations) 1 Hills Road Cambridge CB1 2EU OCR Customer Contact Centre Education and Learning Telephone: Facsimile: general.qualifications@ocr.org.uk For staff training purposes and as part of our quality assurance programme your call may be recorded or monitored Oxford Cambridge and RSA Examinations is a Company Limited by Guarantee Registered in England Registered Office; 1 Hills Road, Cambridge, CB1 2EU Registered Company Number: OCR is an exempt Charity OCR (Oxford Cambridge and RSA Examinations) Head office Telephone: Facsimile: OCR 2017
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