Microbes and Disease & Ecological Relationships

Transcription

1 Microbes and Disease & Ecological Relationships 8C & 8D 26 min 27 marks Q1-L4, Q2-L4, Q3-L5, Q4-L5, Q5-L6, Q6-L6 1. (a) any one from 1 bacteria do not accept 'germs' or 'microbes' viruses fungi (b) (i) to stop micro-organisms passing from Michael to the first-aider 1 accept 'bacteria' or 'viruses' or 'fungi' or 'microbes' or 'germs' for micro-organisms accept 'to stop blood getting on the firstaider' (ii) to stop micro-organisms passing from the first-aider's hands to the cut 1 or to Michael accept 'bacteria' or 'viruses' or 'fungi' or 'microbes' or 'germs' for micro- organisms accept 'rubber gloves are sterile or cleaner than hands' accept 'to prevent the spread of infection or HIV or AIDS' as an alternative to one of the answers only [3] 2. (a) There is not enough light at X. if more than one box is ticked, 1 award no mark (b) flower accept ovary or ovule 1 (c) (i) the food chain must begin with the producer any one from 1 waterweed tadpole water beetle waterweed tadpole minnow waterweed minnow perch GSHS 1

2 (ii) award one mark for the predator (upper answer) and one mark for its prey (lower answer) either 2 pike water beetle or tadpole or minnow or perch or water beetle tadpole or perch water beetle or minnow or minnow tadpole the mark for the prey may only be awarded if it is directly linked to the predator in the diagram (d) breathing or gas exchange accept take in oxygen 1 movement or swimming accept balance or steering 1 [7] 3. (a) 37 C 1 if more than one box is ticked, award no mark (b) the lotion killed the bacteria accept they died or they were killed 1 or destroyed (c) the paper disc soaked in water accept the other disc 1 (d) any two from 2 keep the lid on the dish seal or secure the dish wear gloves wear a mask or goggles use tweezers to add the paper disc do not accept do the experiment in a fume cupboard [5] 4. (a) (i) microscopic plants tadpoles water boatmen perch or microscopic plants water fleas small fish perch 1 accept plants or microscopic for microscopic plants (ii) microscopic plants accept plants 1 GSHS 2

3 (b) decrease accept go down 1 any one from 1 more of them are eaten by perch perch would have no small fish to eat accept because the increased number of water fleas eat more plants, there is less food for tadpoles, therefore fewer tadpoles [4] 5. (a) any one from 1 there were not enough bacteria in the food or body accept the bacteria had to grow first the bacteria multiplied by the next day (b) the antibiotic or medicine killed all the bacteria 1 accept the antibiotics got rid of all the bacteria or there were no bacteria left (c) any one from 1 antibiotic or medicine had not killed all the bacteria accept not all the bacteria had gone there were still bacteria left alive the bacteria multiplied 1 accept the population rose again accept they could grow again accept they reproduced again (d) any one from 1 it slows down reproduction accept it stops them reproducing or it stops them breeding or it stops them multiplying it is too cold for the bacteria to divide or reproduce accept it stops them growing accept slows down growth do not accept they are dormant do not accept it freezes them [5] 6. (a) (i) 1950 and 1955 both dates are required for the mark 1 accept the dates in reverse order accept 1945 and 1955 do not accept 1945 and 1950 (ii) tar accept a named recognised carcinogen 1 accept carbon particles do not accept nicotine or carbon monoxide if both tar and nicotine are given award no mark GSHS 3

4 (b) any one from 1 immunisation accept inoculation vaccination do not accept injection BCG accept TB jab BCG injection do not accept jab BCG jab do not accept shot BCG shot do not accept medicine [3] GSHS 4

5 Atoms and elements/compounds and mixtures 8E & 8F 26 min 26 marks Q1-L3, Q2-L4, Q3-L4, Q5-L6, Q6-L7 1. (a) 4 It is lighter than air. copper for the base of a saucepan It is a good conductor of heat. gold for a ring It is a good conductor of electricity. helium in a balloon It stays shiny because it does react with oxygen. not mercury in a thermometer It is a liquid at room temperature. if more than one line is drawn from any element, award no mark for that element minimum mark zero GSHS 5

6 S N Y9 Revision Booklet 1 Mark Scheme (b) helium 1 if more than one box is ticked, award no mark [5] 2. (a) N at top and S at bottom both poles are required for the mark 1 (b) 1 S N S all three poles are required for the mark S (c) N S 1 all five poles are required for the mark (d) steel accept iron 1 accept nickel accept cobalt [4] 3. (a) very high melting point answers may be in either order 1 good conductor of heat do not accept good conductor 1 (b) (i) good conductor of electricity do not accept good conductor 1 (ii) can be compressed 1 [4] 4. (a) (i) a mixture 1 if more than one box is ticked, award no mark (ii) a compound 1 if more than one box is ticked, award no mark (iii) any one from 1 they are denser than the liquid accept it is heavier than the liquid or the paint accept the solid particles are more dense or heavier or too heavy accept the solid is denser do not accept solid particles are heavy without a comparison or qualifier eg too heavy the liquid is less dense than accept the liquid is less dense or the liquid is the solid lighter GSHS 6

7 (b) any one from 1 it is insoluble in water water is not a solvent for the paint it dissolves in white spirit white spirit is a solvent for the paint it is waterproof is insufficient [4] 5. (a) copper 1 oxygen carbon answers may be in any order all three elements are required for the mark accept correct symbols for the elements accept sulphur' as one of the three elements (b) any one from 1 copper sulphide copper oxide sulphur dioxide carbon dioxide (c) sulphur dioxide do not accept carbon dioxide' 1 [3] 6. (a) (i) A 1 (ii) E 1 (iii) C 1 (b) any one from 1 a compound contains two or more accept a compound contains different elements chemically combined elements or atoms of different types or bonded joined together do not accept a compound contains two or more atoms joined together a mixture contains two or more accept a mixture can be separated by elements or compounds or physical means substances not chemically combined or bonded a mixture can be separated is insufficient (c) (i) any one from 1 name: oxygen formula: O 2 name: hydrogen formula: H 2 name: nitrogen formula: N 2 name: chlorine formula: Cl 2 accept any other element which exists as diatomic molecules in the gaseous state both the name and formula are required for the mark do not accept O or H or N or Cl GSHS 7

8 (ii) any one from 1 name: carbon dioxide formula: CO 2 name: water formula: H 2 O name: sulphur dioxide formula: SO 2 name: nitrogen dioxide or nitrogen oxide formula: NO 2 accept any compound with the formula XY 2, eg magnesium chloride MgCl 2 both the name and formula are required for the mark [6] GSHS 8

9 Energy and electricity/gravity and space 9I & 9J 29 min 31 marks Q1-L4, Q2-L4, Q3-L5, Q4-L6, Q5-L6 1. (a) (i) four arrows, all towards the centre of the Earth 1 A D B C all four arrows, correctly drawn, are required for the mark the arrows may be drawn outside the Earth (ii) ball hanging towards the centre of the Earth at B, C and D 1 all three positions, B, C and D, are required for the mark (b) (i) 365 days accept (ii) 24 hours accept 24 1 [4] 2. (a) (i) 5 1 (ii) 60 1 (iii) thermal accept heat 1 GSHS 9

10 (b) radio 1 (c) light bulb accept bulb or light or lamp 1 [5] 3. (a) (i) circuit A: series 1 circuit B: parallel both answers are required for the mark (b) (i) the circuit or heating element will stop working 1 accept it will not work or it will be off accept the whole circuit has no current through it accept it becomes cooler do not accept it breaks the heater or element or it (ii) any one from 1 the circuit or element will continue to work one wire will not heat the window accept the bottom one has no current through it nothing or it will not be affected are insufficient accept it will work less well accept the bottom wire becomes cooler do not accept it becomes cooler do not accept it does not work properly (c) (i) thermal accept heat 1 (ii) from solid to liquid to gas 1 all three states are required for the mark accept from solid to liquid to vapour or steam accept from ice to water to vapour or gas [5] 4.(a) (i) the dots for Mars, the Earth and Venus should be in a straight line, the 1 shortest possible distance apart Sun Earth V M GSHS 10

11 (ii) any one from 1 it is brightest accept it is brighter it looks biggest or bigger accept it is bigger accept you can see it at night (b) gravity 1 (c) any one from 1 it is circular it is always the same distance from the Earth (d) winter 1 any one from 1 the Northern hemisphere is tilted away from do not accept the Earth is tilted the Sun away from the Sun Britain is in the part of the Earth which is tilted away from the Sun the Sun s rays hit the Earth at more of an angle accept the Sun appears lower in the sky angle accept night is longer than day [6] 5. (a) (i) electrical to chemical if more than one box is ticked, award no mark 1 (ii) chemical to electrical to sound 1 if more than one box is ticked, award no mark (b) Q 1 R 1 P 1 [5] 6. (a) The first marking point is for the transfer of energy from water to turbine. The second marking point is for the transfer of energy from turbine to generator. The third marking point is for the transfer of energy away from the generator. any two from 2 potential energy in the water to kinetic energy in the turbine accept P.E. to K.E. accept transferred from the water to the turbine accept K.E. in the water to K.E. in the turbine accept P.E. in the water to K.E. in the water kinetic energy in the turbine to kinetic energy in the generator accept transferred from the turbine to the generator GSHS 11

12 Y9 Revision Booklet 1 Mark Scheme kinetic energy in the generator to electrical energy in the circuit accept KE. to electrical energy accept from the generator to the circuit accept transferred from the generator by electricity accept KE. in the turbine to electrical energy in the circuit accept potential energy in the water to electrical energy in the circuit for both marks accept P.E. to electrical energy or from the water to the circuit for one mark (b) any one from 1 because the Moon s pull or gravity is always there because the tides or the water cannot run out or be used up accept because there are tides every day or because there is an endless supply (c) from wave energy or from the waves 1 accept Ocean Thermal Energy Conversion or OTEC do not accept hydro-electric power (d) it is easier to control or it can be turned on when it is needed 1 accept the tides only give power at certain times or you can build an oil-fired power station anywhere or it is smaller` any one from oil is non-renewable accept oil will run out it causes pollution accept it gives out greenhouse gases or it can cause oil spills [6] GSHS 12