Of bacteria ignore germs ignore concentration

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of bacteria ignore germs ignore concentration unqualified ignore how long the cleaner lasts for allow reference to odour of cleaning liquid ignore reference to cost unqualified ignore environmental effects / flammability 1 AO3 4.1.1.6 Total 11
MARK SCHEME – GCSE BIOLOGY – 8461/1H – JUNE 2018 10 Question Answers Extra information Mark AO / Spec. Ref. 02.1 any one from: respiration formation of proteins formation / breakdown of glycogen breakdown of (excess) protein or formation of urea photosynthesis or formation of glucose / starch (in plants) allow other correct reference to metabolic reactions in cells ignore reference to digestion ignore formation of carbohydrates 1 AO1 4.4.2.3 02.2 males have a higher metabolic rate than females after five years of age the mean metabolic rate of females decreases faster than males up to 25 years of age each additional tick negates a mark 1 1 AO3 4.4.2.3 02.3 17 53 × 100 32.075472… 32.1 an answer of 32.1 scores 3 marks allow correct rounding of this to at least 4 significant figures allow a correct reduction to 3 significant figures from an incorrect calculation for marking point 2 1 1 1 AO2 4.4.2.3
MARK SCHEME – GCSE BIOLOGY – 8461/1H – JUNE 2018 11 Question Answers Extra information Mark AO / Spec. Ref. 02.4 any two from: (person) R heart rate rose / increased more slowly than (person) S (person) R heart rate levelled off whereas (person) S continued to increase (person) R heart rate rose less (overall / after 5 minutes of exercise) than S allow converse allow correct use of figures eg R increased (overall) by 39 bpm / 65% and S by 54 bpm / 69% ignore lack of units 2 AO3 4.4.2.2 02.5 correct scale and axis labelled all points plotted correctly (to within ± ½ square) line joined point to point or correct curved line of best fit allow min(s) do not accept ‘m’ the zero is not required on the x -axis allow 4 or 5 correct plots for 1 mark 1 2 1 AO2 4.4.2.2 02.6 132 - 78 12 4.5 (minutes) / 4½ minutes / 4 minutes 30 seconds / 4:30 an answer of 4.5 minutes scores 2 marks allow 54 12 allow sequential deductions of 12 four or five times do not accept 4:50 or 4 minutes 50 seconds 1 1 AO2 4.4.2.2
MARK SCHEME – GCSE BIOLOGY – 8461/1H – JUNE 2018 12 Question Answers Mark AO / Spec. Ref. 02.7 Level 3: The method would lead to the production of a valid outcome. All key steps are identified and logically sequenced. 5–6 AO3 4.4.2.2 Level 2: The method would not necessarily lead to a valid outcome. Most steps are identified, but the method is not fully logically sequenced. 3–4 Level 1: The method would not lead to a valid outcome. Some relevant steps are identified, but links are not made clear. 1–2 No relevant content 0 Indicative content two groups of people - non-smokers and smokers have at least five people in each group or large groups get each person to do (named) exercise controlled variables: - same number of people in each group or large groups - same gender - same level of activity / exercise - same age - no health issues / illnesses - same type of exercise - same time for exercise record heart rate for each person before and after exercise

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