[PDF] Cambridge Primary Checkpoint - Science (0843) June 2007 Paper 1 MS.pdf | Plain Text

Science Mark Schemes Cambridge International Primary Achievement Test

Science mark schemes — Achievement Test Guidelines for marking test papers These mark schemes are designed to provide you with all the information \ necessary to mark the Primary Achievement Tests. As far as possible, the mark schemes giv\ e you full guidance regarding acceptable and unacceptable alternative answers and, where app\ ropriate, include examples of student work to illustrate the marking points. However, it \ is not always possible to predict all the alternative answers that may be produced by students and\ there could be places where the marker will have to use their professional judgement. \ In these cases it is essential that such judgement be applied consistently. The guidelines below should be followed throughout (unless the mark scheme states otherwise ):  A correct answer should always be awarded full marks even if the working\ shown is wrong.  Where more than one mark is available for a question the mark scheme exp\ lains where each mark should be awarded. In some cases marks are available fo\ r demonstration of the correct method even if the final answer is incorrec\ t. The method marks can be awarded if the correct method is used but a mistake has bee\ n made in the calculation, resulting in a wrong answer. Method marks can also be \ awarded if the calculation is set up and performed correctly but incorrect values h\ ave been used, e.g. due to misreading the question or a mistake earlier in a series of \ calculations.  If a question uses the answer to a previous question or part question th\ at the child got wrong, all available marks can be awarded for the latter question if app\ ropriate calculations are performed correctly using the value carried forward. P\ laces where such consideration should be made are indicated in the mark schemes. In\ these cases, it is not possible to provide all the alternative acceptable answ\ ers and the marker must follow the child’s working to determine whether credit sh\ ould be given or not.  Half marks should not be awarded and at no point should an answer be awa\ rded more than the maximum number of marks available, regardless of the quali\ ty of the answer. Similarly, negative marks should never be awarded.  If the child has given more than one answer or has supplied additional r\ edundant information the marks can be awarded if all the answers given are correc\ t and non- contradictory (even if some are irrelevant). However, if any incorrec\ t answers/information are given the marks should not be awarded, similarly\ if additional information contradicts the first answer the marks should not\ be awarded (marks for correct working out can still be gained).  If the answer line is blank but the correct answer is given elsewhere, e\ .g. an annotation on a graph or at the end of the working out, the marks can be\ awarded provided it is clear that the child has understood the requirements of t\ he question.

 If the child has produced redundant additional working after the correct\ answer has been reached the marks can be awarded provided the extra work does not c\ ontradict that already done.  Each question and part question should be considered independently and m\ arks for one question should not be disallowed if they are contradicted by workin\ g or answers in another question or part question.  Any legible crossed-out work that has not been replaced can be marked; b\ ut if work has been replaced the crossed-out part should be ignored.  Diagrams, symbols or words are acceptable for explanations or responses.\  Where students are required to indicate the correct answer in a specific\ way, e.g. by underlining or ticking boxes, marks should be awarded for any unambiguou\ s indication, e.g. circling, crossing boxes etc.  Any part of speech is acceptable, e.g. refraction, refracting, refracted\ , and singular and plural forms are acceptable unless otherwise stated, e.g. alveolus, alve\ oli.  Spelling errors should not be penalised where the meaning is clear. In \ the case of specific scientific vocabulary, misspellings should only be accepted if \ the child’s response is phonetically equivalent to the correct answer. For questions involving quantities, e.g. length, mass, time or money, co\ rrect units must be given in the answer. The table shows acceptable and unacceptable versio\ ns of the answer 1.85m. Correct answer Also accept Do not accept Units are not given on answer line and the question does not specify a unit 1.85m Correct conversions provided that the unit is stated, e.g. 1m 85cm 185cm 1850mm 0.00185km 1.85 185m If the unit is given on the answer line, e.g. ……………m …..1.85…… m Correct conversions, provided the unit is stated unambiguously, e.g. …..185cm….. m …..185……m …..1850.… m etc. If the question states the unit that the answer should be given in, e.g. “Give your answer in metres” 1.85m 1.85 1m 85cm 185; 1850 Any conversions to other units. Note: if the answer line is left blank but the correct answer is given e\ lsewhere on the page it can be marked correct if the units match those on the answer line or are\ unambiguously stated.

Each question on the test paper has a box beside it for the teacher to r\ ecord the mark obtained. It is advisable to use these boxes so that students, and othe\ rs looking at the test papers, can clearly see where the marks have been awarded. It is also u\ seful to use the boxes because it makes the process of entering the data into the analysi\ s tool easier. The page total boxes can be used to aid addition but care must be taken not \ to accidentally enter these values into the analysis tool. Finally, it is advisable to use a pen of a different colour to that used\ by the students so that the marks and comments can be clearly seen. It should also be noted that ma\ rking in red ink and using the mark boxes is an essential requirement for the Achievement tes\ ts.

© UCLES 2007 0843/01/M/J/07 Cambridge International Primary Achievement Test- Science Paper 1 Question Mark Answer Additional information 1a 6Bh3 2 Oxygen enters the blood in the lungs. From here it passes to the heart which pumps it through blood vessels called arteries to the whole body. 2 marks for all three correct. 1 mark for two correct. b 6Bh4 4Bh4 2 The harder you work the more energy your muscles need – True Both food and oxygen are needed to make energy – True Muscles push on bones to move your joints – False 2 marks for all three correct. 1 mark for two correct. 2a 6Be1 1 They eat seaweed. Do not accept: they are eaten by crabs b 6Be3 1 Seal or crab c 6Be3 1 prey 3a 6Bh2 1 bladder stomach heartbrain 1 mark for all three in order. b 3Bh2 1 a balanced diet c 6Bh3 2 canine incisor molar crunch and grind grip and stab snip and cut tooth type job tooth diagram 2 marks for all three correct 1 mark for two correct

© UCLES 2007 0843/01/M/J/07 Question Mark Answer Additional information 4a 3Bh3 1 D b 3Bh2 1 C and D both needed for 1 mark 5a 6Cc1 1 New materials made by burning. b 6Cc1 2 Plasticine ball to sausage shape – reversible Ice to water – reversible Raw egg to cooked egg – irreversible 2 marks for all three correct. 1 mark for two correct. c 6Cc1 1 You can get the original material back. Do not allow: it’s reversible. 6a(i) 6Cc3 1 B and C Both needed for the mark. a(ii) 6Cc4 1 Filtration b 6Cc1 1 C c 6Cc5 1 The material is still there but cannot be seen. 7a 6Cc3 1 The salt will dissolve but the sand will not. 1 mark for both correct. b 6Cc4 1 Use equipment X. The solid will be in the filter paper and the solution will be in the flask. 1 mark for all three in that order. c 6Cc6 1 The water will evaporate and leave the salt behind. 1 mark for both in that order. transparent magnetic conducts electricity waterproof copper wire no no yes yes newspaper no no no no glass bottle yes no no yes steel nail no yes yes yes 8a 3Cm1 3Cm2 3 3 marks (one for each material) b 3Cm3 1 insulator of heat

© UCLES 2007 0843/01/M/J/07 Question Mark Answer 9 4Pe4 4Pe5 3 Steel can……S magnet – attract Steel can……N magnet – attract S magnet……N magnet – attract S magnet……S magnet – repel Aluminium can……S magnet – no force Aluminium can……N magnet – no force 10a 4Pe3 1 Water increases the risk of electric shock. b 4Pe1 4Pe2 1 1 1 Use of the 3 correct symbols (bulb, switch, cell) Any complete working circuit (no gaps. 2 bulbs in a working circuit (any order of components) Example: c 6Pe2 1 metal / any named metal, eg copper 11a 6Pe4 1 Only A will light up. b 6Pe4 1 None will light up. c(i) 6Pe4 1 dimmer / fainter / less bright c(ii) 6Pe4 1 dimmer / fainter / less bright 12a 3Pf4 1 rough tiles are less slippy / have more grip or friction b 3Pf2 1 L arrow pointing towards the ground from her feet c 3Pf1 1 gravity / weight

© UCLES 2007 0843/01/M/J/07 Question Mark Answer shape size colour change
keep the same

13 3Sp2 2 1 mark for each row 14a 4Sc2 1 1 metre (must have unit) b 5Sc5 1 Yes. The stopping distance on old tyres is always longer than on new tyres. c 5So4 2 50 40 30 20 10 0 stopping distance in metres road surface rough tarmac smooth concrete smooth asphalt 1 mark for correct named horizontal lines. 1 mark for correct bars. d 5Sc4 1 smooth concrete