Answer P2 2009

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MARKING SCHEME PAPER2 SCIENCE Question Criteria No. I (a) Studentis able to label the structures P : Semi-circularcanal Salur separuh bulat Q; Cochlea Koklea R : Eardrum Gegendangtelinga

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(b) Student i is ableto name i . ;i;;l Semi-circular canal Salurseparuhbulat l i * do not acceptEustachian tubebecauseit is not labelledin diagram1.1

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(c) Studentis ablc;s,m&tchpartsandfunctions I

Vibrateswhen receivessounili i waves B ergetar opabila menerima gelombang bunyi

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Send,impulses to the brain Menghantar impuls ke otak

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Question Criteria No. 2 (a) Studentis able to statethe forms of energyat P i i iti.t I Potentialenergy i':i't Tenagakeupayaan i, i (b) Studentis able statethe point and give reason

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(d) Studentis ableto write energychangesinvolvedi i,.;t (i) Radio :

Illectrical energy -> sound energy i , I l Tenagaeleldrik + tenaga bunyi

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(ii) Q is at the lowest(position) ;,, ., ( pada pating berada keduduknn) rendah; t ,,i Q li,;:.,j r. . or The potential energy changesto kinetic energy as the velocity of the ball bearing increases I Tenagalrcupayaan bertukar kepadatenga kinetik apabila halaju alas bebola semakinmeningl
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(ii) Toaster: Electricalenergy-+heat energy Tenagaeleldrik + tenaga haba

.. + both energy must be written correctly and ---r thp:rnust : be correct . .', . * acceptedif studentwrite 'changeto' and not -r

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(Respirasi) memberiknn/menghasilkantenaga bagi be,n(ghidup i.;j

. ,9r i; -' (fspra{on) releases/giveq out carbon dioxide , (Respirast)me,ftiQgpaskan karbon diokida (b) Studentis able explain why (;To,) aQsorbcarbondioxide (yntuk ) menyerapkarbon diol<sida

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(c) Studentis able to statethe indicator in test tube and give reason ' l I r'J

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answers ,lt q"l : suggested ( (ii)i )"ivingcockrbach usesoxygenduringrespiration \-/Lip as,fti dup menggunakanol<sigen semasa r esp ir asi , / perndasan .or Boiling tub€P containsliving cockroach/living thingglanimaVinsectthat carriesout respiration ',i; Tabu4gdidih P mengandungilipas hidup/benda t hidup/,haiwan/serangga yangmelakukanrespirasi

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I t[ss oxygenin tbsttubebecauseit is usedby living lcockroachandcarbondioxidedissolvein sodium ; hydroxidelowerthe air pressweinsidethe boiling rfubel ', Oxygenberkurangandalamtabungdidih P kerana oleh lipas dankarbon diol<sidalarut di

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Oxygen Oksigen Carbondioxide '',Kribonldloksidai t:::

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Question Criteria No. (a) Studentis able to statethe propertiesof substances 4

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Toothpaste: alkali Ubat gigi : alkali

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Mineral water : neutral Air mineral : neutral

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Vinegar : Acid Cuknmakon : asid

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(b) Studentis ablestatethepH

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Slakedlime is alkaline Kapurmati adalahberalkali

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To reduce/ lessenacidityof the soil Mengurangkankeasidan tanah

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*do not acceptneutralizesoil tidak terima meneutralknntanah t.

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, i i i i ii r Question C r i t e r' ii :ar i ,, ,l I I No. (a) Studbnt,isable to statethe period of menstrual cycle 5 .

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(b) Sludent is able nar4ethe phaseand shadethe area i

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u) S[uddlt i! ablejtu;state wliathappens ro thelining '.i :.

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,(Thelining of uteruswali) breaksoff / shedand :disharge out with a little bloodandunfertilized

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iowm); I Lapis'andinding uterus tertanggal/ luruMterttrai d,an ,,d$ingkirkan keluar (bersama-samasedikit darah dan ,iovym yang tidak disenytmukun) ! llt

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(d) Studentis ableto;statethe dateof menstruation and , cirdlethedate,ofovulation i

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, (i) 4ftAugust2009 : 4 Ops 2009

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(ii).pircle20thAugust any marli'is long asit showscorrectdate '.-;fld{ept illl,j ' :

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(e) Studentis ableto namethe natural method and ex i

Rhythm method Kaedahritma

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(ii) prevent/ avoid corpulation/ sexualintercourse during fertile phase Mengcegah/mengeIakkanp ersetubuhansemasa fu sa subur

or:; temperatuie method kaedahsuhu

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the rvife checkson her body temperaturedaily isteri merekodkansuhu badanharian OI

mucusmethod koedahmucus/lendir ;:,t:

Checkson the mucuswhereby if more mucus producedis more often it is aboutto occurovulation memeriksalendir atau mucusdimanalebih banyak muctts di hasi Iknn apabi Ia p engovulan sentakin hsmnir 1 mark for correct method and 1 mark for correct explaination

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.l;'i, Question Criteria ,j No. (a) iStudentis able to draw the direction of current 6

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Accept:at any point ( one arrow is enough)

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I mark for correct magnetic lines ( acceptone line/ . dottedline) o 1 mark for correct direction ( accept I anow) b)' | rStudentis able statethe rule ,ir

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iRight handgdp rule tangankanan ,lPttorry:anBehEgaman .

c) rstudentis ableto statewhathappensto the paperclip :

, (i) dropoff/ fall dowr/ will not be attracted ' Jatuh/ tidqk tertarik 'I

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(ii; iron.nail has lost its magnetism//ironnail is not 'l' dn electromagnet,because currentdoesnot : i ,i, flow thkiugh iV there is no current flow ':t Paht besi hilang kemagnetan//tidakmenjadi, eleldromagnetkerana tiada arus mengalir

melaluinya i (d) Sg@ntisable to give examples , Suggestedanswer ; (i) elcctricbell : ; j :,t\Locengelehrik : (iD Telephooe,oarpiece '; ,i, Gagangielinga telefon ,

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(iii) Electromagnetcrane Kren elektromagnet (iv) Car horns Hon kereta * any two correct suitableexarnples Question Criteria No. (a) Studentis able to statethe observation

Copperrod Bulb lightsup Mentolmenvala Plasticrod

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Bulb doesnot light up Mentol tidak menyala

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(b) Studentis able characteristicof substances Iron rod tr&tz-drov r,l c((_trltr-

: can conduct electric / good conductor of electricity/ enablecurrentto flow 1, , , boleh menglanduksi elehr ik/ lnnduktoi elelarik yang baik/membenarlranarus mengalir

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Plasticrod : cannotconduct electric / poor conductor of electricity/ disable curent to flow tidak mengkonduks i elehr iH konduh or elehr i k y ang IemaV t idak membenarkan arus mengalir ii;;i,l

(c) Studentis ableto classifuandnamethe substances Sampleanswer : Goodconductor of electricity Konduhor elektrikyang baik

Poorconductorof electricity Konduktorelektrik yang lemah ,.

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Iron rod, copper rod Rod besi,rod kuprum

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Question Critbri,a : iii No. (a) Sfudent'isable to statethe inference 8 i, iil

Sampleanswer -rsugarin glassP dissolvesfasterbecauseit is strirred Gila di dalam gelas P larut lebih cepat kerqna ia ;dikacau , -lSdlar gandissolvefasterwhen it is stined " lGila [bbih cepat larut jika ia dikacau : -;Stining affebtsthe solubility of sugar ,MEngacau aknn mempengaruhi keter Iar utan gul a -:solubility of sugarin water dependson the stirring i Keterlartuan gula di dalam bergantungkepadaianya ',kacau'.

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aute statethe variables tl'.?*$"*;s Variables i

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Temperatureof water Suhuair Readingof stop watcUl rateof solubility// time taken for sodium chloride to dissolve Bacaanjam randiU/ kndar keterlarutan// masayang, diambil natrium klorida : untuk larut Volume of water ll rate of stining// massof sodium chloride ll sizeof solute/ sodium chloride Isipadu air// kadar mengacau// jisim natrium klorida// saiz zat terlarut/' natrium klorida

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(ii) jStudent 'abJ.e_Lo completethe table i

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