Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
2008 B3: Answers FOUNDATION TIER 1. (a) (i) vena cava, atrium, ventricle, aorta [4] (ii) Arrow line continued on left into aorta [1] (iii) Valve [2] prevent backflow (of blood)/ blood going the wrong way (not: stop blood flowing back out of heart) (b) Muscle; pump; arteries; veins [4] Question total [11] 2. (a) (i) B [1] (ii) Urine (not: urea) [1] (b) (i) Urea [1] (ii) Protein; glucose (not: sugar) [2] Question total [5] 3. (a) Phosphate Poor root growth/ too few roots/roots smaller [1] Nitrate stem shorter/poor stem growth (not: its short) [1] (b) From water in the soil [1] Question total [3] 4. (a) (i) Kills (unwanted) microbes/bacteria/ sterilise the wire; [1] (not: removes microbes/kills germs) (ii) Keeps microbes away from gel/out/ prevent microbes entering; [1] (iii) Prevents lid being removed/stop dish being opened [1] (not: keeping microbes out) (b) Plotting correct (+/- 0.5 square) -1 per error; [2] Line drawn with ruler joining centre of plots [1] (c) (i) Correct graph reading/138 (not: if oC); [1] (ii) Grow faster at 25ºC than at 15ºC [1] (iii) Slows/prevents growth / multiplication of bacteria [1] (not: kills bacteria/less bacteria Question total [9] 5. (a) Contains living bacteria [1] (b) Kills/destroys microbes/sterilise [1] (not: remove/denature/pasteurise) (c) (i) 30ºC [1] (ii) 43ºC [1] (no double penalty for units) (d) 8 – 10 hours [1] (e) (i) Bacteria [1] (ii) Proteins solidify/sets yogurt/milk [1] (not: acids act on protein) Question total [7] FOUNDATION AND HIGHER TIER 6/1. (a) (i) Tube A 1.9 (allow: between 1.8 to 2.0) [1] Tube B 3.6 [1] (ii) Shoot in tube B has more / larger leaves / larger surface area [1] (not: reference to cuticle/stomata numbers) Loses more water/mass by [1] transpiration / transpires more [1] (not: evaporation) [ORA] (iii) Prevent evaporation (not: transpiration/water loss)) [1] (iv) Air directed at the leaves by a fan [1] (b) Stoma(ta)/guard cells [1] Question total [8] 7/2. (a) outer membrane completed [1] ( allow if pseudopodia drawn touching) bacteria in vacuole [1] (b) blood clot is formed/scab/ platelets seal wound [1] (not: platelets unqualified) (intact) skin/prevents entry of bacteria [1] Question total [4] 8/3. (a) (i) glucose / sugar / amino acids / mineral salt / named salt/minerals [1] (ii) to provide oxygen for respiration / mixing [1] (not: stirring/reference to fermentation) (b) fungi / moulds [1] Question total [3] HIGHER TIER 4. (a) (i) 55 (ºC) [1] (ii) enzymes are denatured/destroyed (not: killed) [1] (iii) substrate / pulped apple used up / all juice extracted/ all pectin broken down/maximum working of pectinase [1] ( not: reference to limiting factor unqualified) (iv) pH / volume / concentration of enzyme/variety or type of apple [1] (not: amount/quantity/temperature) (b) pre-digestion of baby foods / biological washing powders/cheese making/soft centred chocolates/lactose free milk (not: beer making) [1] Question total [5] 5. to lungs/alveoli [1] *pulmonary vein [1] *left atrium [1] *left ventricle [1] correct reference to (functioning of ) valve (preventing backflow) [1] (* mark for 2 structures in correct link) 6. (a) A Bowmans capsule [1] B collecting duct [1] (b) On capillary knot [1] (c) protein � x x [1] water � � � [1] urea � � � [1] glucose � � x [1] (d) (i) (I) 80 (II) 6 [2 × 1] (ii) More people are able to work (full time) /ORA [1] (iii) Relatives will have similar tissue types / genes /DNA/ less chance of rejection [1] (not: similar blood groups) Question total [11] 7. (a) Made the bacteria resistant (to the antibiotic) / caused mutation [1] (b) As a control / fair test / to show the antibiotic was needed to kill bacteria [1] (c) Bacteria mutate (not: change unqualified by genes) [1] Mutations cause resistance [1] Resistance is passed on via genes/reproduction [1] (not: bacteria become resistant) [Any 3 × 1] Question total [5] 8. (a) (i) Mitosis / cloning/cell division [1] (not: reproduction/division/meiosis) (ii) Antigen [1] (iii) Antibody [1] (iv) Memory cell (not: wbc/leucocyte) [1] Triggers/causes a rapid/immediate response when the virus infects again [1] (b) (i) (I) 120 [1] (II) 160 [1] (ii) There is no link / ending MMR vaccinations does not halt rise in autism [1] (c) Vaccination prevents disease spreading/reduces number of cases of measles/evidence shows MMR doesn’t cause autism. [1] Question total [9]