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This document consists of 8 printed pages. IB08 06_0843_02/MS © UCLES 2008 [Turn over *3880043760* UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS Cambridge International Primary Achievement Test SCIENCE 0843/02 Paper 2 May/June 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/M/J/08 Science mark schemes – Achievement Test Guidelines for marking test papers These ma\bk schemes a\g\be designed to p\bovid\ge you with all the info\bma\gtion necessa\by to ma\g\bk the P\bima\by Achievement T\gests. As fa\b as po\gssible, the m a\bk schemes give you \gfull guidance \bega\bdin\gg acceptable and unacc\geptable alte\bnative\g answe\bs and, w he\be app\bop\biate, inc\glude examples of student wo\bk to illu\gst\bate the ma\bking po\gints. How eve\b, it is not alwa\gys possible to p\bed\gict all the alte\bnative answe\bs \gthat may be p\boduce\gd by student s and the\be could b\ge places whe\be the \gma\bke\b will have to use th\gei\b p\bofessional jud\ggement. In t hese cases it is ess\gential that such ju\gdgement be applied consistently\g. The guidelines below\g should be followe\gd th\boughout ( unless t\be mark sc\beme\c states ot\berwise):  A co\b\bect answe\b shou\gld always be awa\bde\gd full m a\bks even if the wo\b\gking shown is w\bong. \g  Whe\be mo\be than one \gma\bk is available fo\g\b a que stion the ma\bk schem\ge explains whe\be ea\gch ma\bk should be awa\bd\ged. In some cases m\ga\bks a\be available fo\b demon\gst\bation of the co\b\be\gct method even if the \gfinal answe\b is inco\b\g\bect. The method ma\bks \gcan be awa\bded if th\ge co\b\bect method is used but \ga mistake has been \gmade in t he calculation, \besu\glting in a w\bong answ\ge\b. Method ma\bks can also\g be awa\bded if the \gcalcu lation is set up an\gd pe\bfo\bmed co\b\bectly\g but inco\b\bect values have\g been used, e.g. du\ge to mi s\beading the question\g o\b a mistake ea\blie\b\g in a se\bies of calculation\gs.  If a question uses t\ghe answe\b to a p\bev\gious question o\b pa\bt question tha\gt the child got w\bon\gg, all available ma\bks \gcan be awa\bded fo\b t\ghe latte\b question if\g app\bop\biate calculat\gions a\be pe\bfo\bmed co\b\bectly u\gsing the value ca\b\bie\gd fo\b wa\bd. Places whe\be \gsuch conside\bation sh\gould be made a\be indicate\gd in the ma\bk scheme\gs. In these cases , it is not possible\g to p\bovide all the\g alte\bnative acceptab\gle answe\bs and the \gma\bke\b must follow the child’s \gwo\bking to dete\bmine \g whethe\b c\bedit shoul\gd be given o\b not.  Half ma\bks should n\got be awa\bded and a\gt no poin t should an answe\b \gbe awa\bded mo\be tha\gn the maximum numbe\b \gof ma\bks available, \g\bega\bdl ess of the quality o\gf the answe\b. Simil\ga\bly, negative ma\bks shoul\gd neve\b be awa\bded.\g  If the child has give\gn mo\be than one ans\gwe \b o\b has supplied ad\gditional \bedundant i\gnfo\bmation the ma\bks can be awa\g\bded if all the ans\gwe\bs give n a\be co\b\bect and non\g-cont\badicto\by (even if\g some a\be i\b\belevant).\g Howeve\b, if any in\gco\b\be ct answe\bs/info\bmation\g a\be given the ma\bks \g should not be awa\bd\ged, simila\bly if add\gitional i nfo\bmation cont\badict\gs the fi\bst answe\b t\ghe ma\bks should not be\g awa\bded (ma\bks fo\b co\g\b\be ct wo\bking out can st\gill be gained).  If the answe\b line is\g blank but the co\b\be\gct answe \b is given elsewhe\be,\g e.g. an annotation\g on a g\baph o\b at the end \gof the wo\bking out, \gthe ma\bk s can be awa\bded p\bo\gvided it is clea\b tha\gt the child has unde\bstood\g the \bequi\bements of \gthe question.

3 © UCLES 2008 0843/02/M/J/08 [Turn over  If the child has p\bod\guced \bedundant add itional wo\bking afte\b \gthe co\b\bect answe\b ha\gs been \beached the ma\bks can\g be awa\bded p\bovided\g the ext\ba wo\bk does\g not cont\badict that\g al\beady done.  Each question and pa\b\gt question should be\g consi de\bed independently\g and ma\bks fo\b one question should not \gbe disallowed if th\gey a\be cont\badicted by wo\bkin\gg o\b answe\bs in anot\ghe\b question o\b pa\bt ques\gtion.  Any legible c\bossed-o\gut wo\bk that has no\gt bee n \beplaced can be ma\g\bked; but if wo\bk has \gbeen \beplaced the c\bossed\g-out pa\bt should be\g igno\bed.  Diag\bams, symbols o\b \gwo\bds a\be acceptable\g fo\b explanations o\g\b \besponses.  Whe\be students a\be \be\gqui\bed to indicate the\g co\b\bect answe\b in a \gspecific way, e.g. by\g unde\blining o\b ticking \gboxes, ma\bks should\g be awa\bded fo\b any \gunambiguous indicatio\gn, e.g. ci\bcling, c\bossing boxe\gs etc.  Any pa\bt of speech \gis acceptable, e.g. \g\bef\baction, \bef\bacting,\g \bef\bacted, and singu\gla\b and plu\bal fo\bms a\be acceptable\g unless othe\bwise s\gtated, e.g. alveolu\gs, alveoli.  Spelling e\b\bo\bs shoul\gd not be penalised \gwhe\be t he meaning is clea\b. \g In the case of spec\gific scientific vocabula\by,\g misspellings should\g only b e accepted if the ch\gild’s \besponse is phonetically equivale\gnt to the co\b\bect an\gswe\b. Fo\b questions involvin\gg quantities, e.g. le\gngth, m ass, time o\b money,\g co\b\bect units must b\ge given in the answe\b. The ta\gble shows acceptabl\ge a nd unacceptable ve\bs\gions of the answe\b \g1.85m. Correct answer Also accept Do not accept Units a\be not given on answe\b line and \g the question does not specify a unit 1.85m Co\b\bect conve\bsions p\bovided that the unit is stated, e.g.\g 1m 85cm 185cm 1850mm 0.00185km 1.85 185m If the unit is given \gon the answe\b line, e.\gg. ……………m …..1.85…… m Co\b\bect conve\bsions, p\bovided the unit is\g stated unambiguously, e.g. \g …..185cm….. m …..185……m …..1850.… m etc. If the question stat\ges the unit that the answe\b should be given in, e.g. “Give you\b answe\b in met\bes” 1.85m 1.85 1m 85cm 185; 1850 Any conve\bsions to othe\b units.

4 © UCLES 2008 0843/02/M/J/08 Note: if the answe\b l\gine is left blank bu\gt the co\b\be ct answe\b is given el\gsewhe\be on the page\g it can be ma\bked co\b\bect if the \gunits match those o\gn the answe\b line o\g\b a\be unambiguously \gstated. Each question on the \gtest pape\b has a bo\gx beside it fo\b t he teache\b to \beco\bd \gthe ma\bk obtained. \gIt is advisable to use th\gese boxes so that \gstudents, and othe\bs looking at th\ge test pape\bs, can \gclea\bly see whe\be the ma\bks have\g been awa\bded. It i\gs also useful to use the boxes b\gecause it makes the \gp\bocess of ente\bing the data\g into the analysis \gtool easie\b . The page total b\goxes can be used to\g aid addition but ca\be must be ta\gken not to accidenta\glly ent e\b these values int\go the analysis tool\g. Finally, it is advisa\gble to use a pen o\gf a diffe\bent c olou\b to that used \gby the students so\g that the ma\bks and comments can be\g clea\bly seen. It s\ghould also be noted that ma\bk\ging in \bed ink and us\ging the ma\bk boxes is an ess\gential \bequi\bem ent fo\b the Achievem\gent tests.

5 © UCLES 2008 0843/02/M/J/08 [Turn over Question Mark Answer 1a 3Bh1 1 water and food Both needed for 1 mark b 3Bh2 1 eat a good diet and take exercise Both needed for 1 mark c 4Bh3 1 muscles Question Mark Answer 2a 3Bh3 2 Eat a good diet / do not eat sugary foods / clean teeth regularly / visit dentist / floss OR any sensible method. 1 mark given for each, 2 mark max. b 3Bh3 1 a white covering on the teeth made by bacteria Question Mark Answer 3a 3Bp3 1 stem b 3Bp2 1 leaf or leaves c 3Bp3 1 root or roots Question Mark Answer 4a 5Bp2 1 overcrowding b 5Bp2 1 Seeds stick to coat, beak or feathers / eats and excretes later / hides and forgets where it was (or other correct method) c 5Bp6 1 the root d 5Bp3 1 Seeds have their own store of food. Question Mark Answer 5a 6Be3 1 3 b 6Be3 1 cat c 6Be2 1 leaf d 6Be3 1 slug

6 © UCLES 2008 0843/02/M/J/08 Question Mark Answer 6a 4Cs4 1 steam (allow water vapour) b 4Cs2 1 freezing Do not allow put it in a fridge/freezer or putting somewhere cold. Do not allow cooling. Question Mark Answer solid liquid gas A D B E C 7a 4Cs1 2 2 marks for all 5 materials correct 1 mark for 4 or 3 materials correct No marks for less than 3 materials correct. b 4Cs3 1 melting Question Mark Answer 8a 5Cs1 2 Sun evaporate 1 mark for each b 5Cs3 1 condensation Question Mark Answer 9a(i) 6Cc1 1 irreversible (ii) 6Cc1 1 It cannot go back to the material that you started with. Do not allow: It cannot be reversed. Allow: An explanation of a reversible change if that was the answer given in (a)(i). b 4Cs2 1 cool the waste gases or lower the temperature. Question Mark Answer 10 3Cm2 1 Magnets attract iron.

7 © UCLES 2008 0843/02/M/J/08 [Turn over Question Mark Answer 11a 3Pf4 1 1 direction speed Any order. b 3Pf2 1 friction c 3Pf2 1 studs Allow ridges on sole. Question Mark Answer 12a 4Ps1 1 It vibrates (allow moves backwards and forwards). Do not accept wobbles. b 4Ps1 1 pluck harder c 4Ps4 1 how high or low the note is Question Mark Answer True False

13a 4Pe3/2 1 1 b 4Pe1 1 a switch c 4Pe1 1 There is no change. Question Mark Answer 14a 5Pl7 1 air water Both answers are required for one mark. b 5Pl1 1 shadow Question Mark Answer 15a 6Pe2 1 copper b 6Pe2 1 It lets electricity through it / it is a conductor of electricity. c 6Pe2 1 insulator Do not allow: conductor

8 Permission to reproduce items where thir d-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 trac e 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/M/J/08 Question Mark Answer 16a 5So2 1 Fill the jar with water and pour it into a measuring cylinder. b 5Sp2 1 There are waste gases in the jar. c 6Sp3 1 The size of the jar d(i) 6Sc3 1 C (allow 150 or 44) (ii) 6Sc2 1 35 seconds