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This document consists of 8 printed pages. 11_0843_02/MS © UCLES 2008 [Turn over *4460607522* UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS Cambridge International Primary Achievement Test SCIENCE 0843/02 Paper 2 October/November 2008 MARK SCHEME Maximum Mark : 50 IMPORTANT NOTICE Mark Schemes have been issued on the basis of one copy per Assistant examiner and two copies per Team Leader.

2 © UCLES 2008 0843/02/MS/O/N/08 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. Howe\ ver, 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 jud\ gement. 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 seri\ es of calculations.  If a question uses the answer to a previous question or part question th\ at the student got wrong, all available marks can be awarded for the latter question if\ appropriate 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 student’s working to determine whether credit \ should 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 student has given more than one answer or has supplied additional\ redundant 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).

3 © UCLES 2008 0843/02/MS/O/N/08 [Turn over  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 student has understood the requirements of\ the question.  If the student has produced redundant additional working after the corre\ ct answer has been reached the marks can be awarded provided the extra work does n\ ot contradict 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, \ alveoli.  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 student’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.

4 © UCLES 2008 0843/02/MS/O/N/08 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 tha\ t marking in red ink and using the mark boxes is an essential requirement for the Achieve\ ment tests.

5 © UCLES 2008 0843/02/MS/O/N/08 [Turn over Question Mark Answer 1 4Cs3 2 melting a liquid turning into a gas Process Change of State boiling a liquid turning into a solid freezing a solid turning into a liquid 2 marks 2/3 correct 1 mark 1 correct Question Mark Answer 2a 6Be1 1 Arrow head pointing towards, Grass
Impala
Cheetah b 6Be2 1 grass c 6Be3 1 Cheetah d 6Be2 1 Impala Question Mark Answer 3a 3Cm4 2 Glass metals nylon oil plastic rocks 2 marks for 3 correct 1 mark for 1/2 correct If more than 3 words underlined subtract 1 mark for each one over 3. Naturally- occuring Man-made Tshirt Cotton Silk Nylon Polyester b 3Cm3 3 Canoe Wood Bark Fibreglass Plastic 3 marks for all 4 correct 2 marks 2/3 correct 1 mark 1 correct Allow sensible alternatives.

6 © UCLES 2008 0843/02/MS/O/N/08 Question Mark Answer 4a 4Sp2 2 1 mark each for any two of the following: Using the same mass of soil Heating for the same amount of time / Heating all for 1hr Using the same oven / Heating them together Allow other sensible answers b 4Sc2 1 They all lost water ci 5Sc3 1 It contained the most water cii 5Sc3 1 conclusion d 3Cm1 1 Allows water to flow through it. Question Mark Answer 5a 3Pf1 1 A b 3Pf4 1 Any reference to slowing down or decrease in speed c 6Pf3 1 It has less energy than when it was moving. d 3Pf2 1 Friction Do not allow drag Question Mark Answer 6a 5Pl7 2 Give one mark if there are two lines, one from Petra to mirror and one from mirror to Kofi Give one mark if both lines have arrow heads Kofi Petra wall mirror allow two marks if the line is continuous but only has one arrowhead b 5Pl9 1 Petra can no longer see Kofi. Allow ‘they cannot see each other’ or ‘it blocks the light or reflection’ but not ‘it gets in the way’.

7 © UCLES 2008 0843/02/MS/O/N/08 [Turn over Question Mark Answer 7a 3Bp1 4 Petal Stem Leaf Roots b 5Bp1 1 Carry pollen from one flower to another flower. Allow pollination. c 5Bp5/6 1 Fertilised Question Mark Answer 8a 6Pe4 1 Dimmer/less bright/not as shiny/less light b 6Pe4 1 Dimmer/less bright/not as shiny/less light c 6Pe4 1 Brighter/ more bright/ more shiny/more light d 6Pe4 1 All bulbs go out Question Mark Answer 9a 6Cc2 2 sieve fingers magnet mixed nuts iron powder and salt rice and flour 2/3 correct 2 marks 1 correct 1 mark bi 6Cc2 1 Dissolves salt bii 6Cc2 2 Iron powder A Salt C 1 mark for each

8 Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to t race copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opport\ unity. University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a depa\ rtment of the University of Cambridge. © UCLES 2008 0843/02/MS/O/N/08 Question Mark Answer 10a 6Pf1 1 Weight or Gravity b 6Pf1 1 Newton c 3Pf3 1 Any reference to the animal being lighter or Isaac being heaver, bigger weight, etc. Weight on its own is not allowed. Question Mark Answer 11a 6Bh3 3 Artery Takes blood to the surface of the skin Vessel Job Capillary Carries oxygenated blood around the body Vein Carries blood back to the heart 1 for each correct answer b 6Bh3 1 Muscle Question Mark Answer All three are True Statement True False The air inside the whistle is vibrating.
The whistle is vibrating.
12a 4Ps1 2 The air around the whistle is vibrating.
All 3 correct 2 marks 2 correct 1 mark 0/1 correct 0 mark b 4Ps4 1 How high or low a note is c 4Ps5 1 Any reference to placing fingers on different holes is acceptable