Animal Tissues, Organs and Organ Systems
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1 F me awesome GCSE and A level resources, visit us at Animal Tissues, Organs and Organ Systems Mark Scheme Level GCSE (9-) Subject Biology Exam Board AQA Topic 4. Organisation Sub-Topic Animal Tissues, Organs and Organ Systems Difficulty Level Silver Level Booklet Mark Scheme Time Allowed: 58 minutes Sce: /58 Percentage: /00 Grade Boundaries: Page
2 F me awesome GCSE and A level resources, visit us at M.(a) 55% marks f crect answer alone accept / 0 00 alone gains mark (b) any three from: amino acids antibodies antitoxins carbon dioxide cholesterol enzymes fatty acid glucose glycerol hmones / named hmones ions / named ions proteins urea vitamins water. igne blood cells and platelets igne oxygen max named example of each f ions and hmones allow minerals 3 (c) Marks awarded f this answer will be determined by the Quality of Communication (QC) as well as the standard of the scientific response. Examiners should also refer to the infmation in the Marking Guidance and apply a best-fit approach to the marking. 0 marks No relevant content. Level ( marks) There is a description of pathogens with errs roles confused. the immune response with errs roles confused. Level (3 4 marks) There is a description of pathogens and the immune response with some Page
3 F me awesome GCSE and A level resources, visit us at errs confusion a clear description of either pathogens the immune response with few errs little confusion. Level 3 (5 6 marks) There is a good description of pathogens and the immune response with very few errs omissions. Examples of biology points made in the response: bacteria and viruses are pathogens credit any ref to bacteria and viruses they reproduce rapidly inside the body bacteria may produce poisons / toxins (that make us feel ill) viruses live (and reproduce) inside cells (causing damage). white blood cells help to defend against pathogens by: ingesting pathogens / bacteria / (cells containing) viruses credit engulf / digest / phagocytosis to destroy (particular) pathogen / bacteria / viruses producing antibodies to destroy particular / specific pathogens producing antitoxins to counteract toxins (released by pathogens) credit memy cells / crect description this leads to immunity from that pathogen. 6 [] M.(a) Marks awarded f this answer will be determined by the Quality of Communication (QC) as well as the standard of the scientific response. Examiners should also refer to the infmation in the Marking guidance and apply a best-fit approach to the marking. 0 marks No relevant content. Level ( marks) The method described is weak and could not be used to collect valid results, however does show some understanding of the sequence of an investigation. Level (3 4 marks) The method described could be followed and would enable some valid results to be collected, but lacks detail. Page 3
4 F me awesome GCSE and A level resources, visit us at Level 3 (5 6 marks) The method described could be easily followed and would enable valid results to be collected. Examples of the points made in the response: bean seedlings of same age cut material from same part of each gan (f repeats) e.g. top cm of stem / a whole cotyledon / seed equal mass of each gan accept weight f mass grind / homogenise in equal amounts of water / buffer equal volumes of hydrogen peroxide solution equal concentrations of hydrogen peroxide solution same temperature temperature maintained in water bath quantitative measure of gas production eg height of foam in mm / collect gas in graduated syringe in cm 3 f same time period repetitions (3+ times) calculate mean f each. 6 (b) (i) crect answer: 40 mark f 45 as the anomalous result has been included in the calculation mark f vertical axis crectly labelled: Enzyme activity in arbitrary units allow ecf from (b)(i) points plotted crectly ± mm deduct mark f each increct plot suitable line of best fit not feathery, not point to point (iii) 6.0 / 6 Page 4
5 F me awesome GCSE and A level resources, visit us at allow ± 0. if 6.0 not given, allow crect f candidate s graph ± 0. (iv) in range 0 to 4 units allow crect f candidate s graph (v) enzyme denatured / enzyme (active site) shape changed allow substrate no longer fits (active site) igne reference to temperature do not allow enzyme dies [5] M3.(a) (i) glycerol pancreas / small intestine accept duodenum / ileum igne intestine unqualified (b) any two from: type of milk volume / amount of milk vol. bile equals vol. water volume of lipase concentration of lipase temperature igne time interval igne solution unqualified do not allow ph igne starting ph igne volume / amount of bile / water igne concentration of bile accept amount of lipase if neither volume n concentration given (c) (i) fatty acid (production) Page 5
6 F me awesome GCSE and A level resources, visit us at faster reaction / digestion (with bile) ph decreases faster (with bile) takes less time (with bile) steeper fall / line (with bile) allow use of data igne easier (iii) all fat / milk digested same amount of fatty acids present (lower ph) denatures the enzyme / lipase allow all reactants used up igne reference to neutralisation allow enzyme won t wk at low ph do not allow enzyme killed [7] M4.(a) any two from: carbon dioxide / CO urea protein water / H O hmones / insulin. igne food / waste / alcohol / drugs / enzymes igne glucose and oxygen allow two crect hmones f marks allow two crect food components f marks allow antibodies allow antitoxins (b) (i) plasma platelets (cardiac) muscle allow muscular Page 6
7 F me awesome GCSE and A level resources, visit us at (c) Marks awarded f this answer will be determined by the Quality of Written Communication (QWC) as well as the standard of the scientific response. Examiners should also refer to the infmation in the Marking Guidance and apply a best-fit approach to the marking. 0 marks No relevant content Level ( marks) There is a description of at least one advantage of the cow tissue valve a description of at least one disadvantage of the cow tissue valve. Level (3 4 marks) There is a description of at least one advantage of the cow tissue valve and at least one disadvantage of the cow tissue valve. Level 3 (5 6 marks) There is a description of the advantages and disadvantages of the cow tissue valve a description of several advantages of the cow tissue valve and at least one disadvantage. Examples of the points made in the response Advantages of cow tissue valve: abundant supply of cows so shter waiting time igne can take many years to find a suitable human don no need f tissue typing quicker operation less invasive shter recovery time cheaper operation costs less operation / anaesthetic risks. Disadvantages of cow tissue valve: made from cow so possible objections on religious grounds igne ethical arguments new procedure so could be unknown risks allow possible transfer of disease from cow risks of using a stent eg. blood clots, stent breaking valve tearing Page 7
8 F me awesome GCSE and A level resources, visit us at not proven as a long term treatment may be rejected igne infmation copied directly from the table without value added. 6 [] M5.(a) (i) diffusion carbon dioxide accept CO / CO do not accept CO (iii) red blood cells (b) 70 if no / increct answer then x 0.5 gains mark igne doubling the answer (c) allows me gas / oxygen / CO (exchange) do not accept air [6] M6.(a) any three from: Page 8
9 F me awesome GCSE and A level resources, visit us at parts of ganisms have not decayed accept in amber / resin allow bones are preserved conditions needed f decay are absent accept appropriate examples, eg acidic in bogs / lack of oxygen parts of the ganism are replaced by other materials as they decay accept mineralised other preserved traces of ganisms, eg footprints, burrows and rootlet traces allow imprint marking of ganism 3 (b) (i) teeth f biting (prey) must give structure + explanation claws to grip (prey) accept sensible uses wing / tail f flight to find (prey) any two from: new predats new diseases better competits catastrophe eg volcanic eruption, mete changes to environment over geological time accept climate change allow change in weather prey dies out lack of food allow hunted to extinction [8] Page 9
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