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MARKING SCHEME : PAPER THREE – TRIAL BIOLOGY SPM 2014

Questio 1 :

1(a)MEASURING USING NUMBER  

Score Explanation

3

Able to record !"" correct final mass in able !"oncentration of s#crose

sol#tion ($)%inal mass of &ater spinac'

after 3 min#tes()! *+ +, 3-- +

! Able to state an. 3/+ final mass correctl.1 Able to state an. 1/! final mass correctl. No response or &ron response

 1(b)i) 0BSERAI0N

Score Explanation

3

Able to state t#o correct obser2ations based on follo&in criteria41 5 "oncentration of s#crose sol#tion4! 5 %inal mass of &ater spinac' after 3 min#tes

Sample Ans&er61 7'en !$ concentration of s#crose sol#tion is #sed8t'e final mass of &ater

spinac' after 3 min#tes is *! 7'en -$ concentration of s#crose sol#tion is #sed8t'e final mass of &ater

spinac' after 3 min#tes is +

! Able to state an. one obser2ation correctl. &it'0r

Able to state an. t&o incomplete obser2ation

1 7'en !$ concentration of s#crose sol#tion is #sed8t'e final mass of &aterspinac' after 3 min#tes is 'i'

! 7'en -$ concentration of s#crose sol#tion is #sed8t'e final mass of &aterspinac' after 3 min#tes is lo&

1 Able to state an. one idea of obser2ation1 "oncentration of s#crose sol#tion #sed is affected b. t'e final mass of &aterspinac' after 3 min#tes

No response or &ron response

1

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1(b) (ii) IN%EREN"EScore Explanation

3 Able to state t#o reasonable inferences for t'e obser2ation

Sample ans&er6Inference 1

!$ concentration of s#crose sol#tion8 more &ater molec#les diff#se into &aterspinac' b. osmosis beca#se t'e si9e of molec#les are small::ca#sin t'e &aterspinac' strips to c#r2e o#t&ard

Inference !6-$ concentration of s#crose sol#tion8 more &ater molec#les diff#se o#t from&ater spinac' b. osmosis beca#se t'e si9e of &ater molec#les is small::ca#sint'e &ater spinac' strips to c#r2e in&ard

! Able to state an. one correct inference and one inacc#rate inference

1 more &ater molec#les diff#se into &ater spinac' b. osmosis beca#se t'e si9eof molec#les are small::ca#sin t'e &ater spinac' strips to c#r2e o#t&ard

! more &ater molec#les diff#se o#t from &ater spinac' b. osmosis beca#set'e si9e of molec#les are small::ca#sin t'e &ater spinac' strips to c#r2e in&ard

1 Able to state an. one idea of inference1 &ater molec#les diff#se into &ater spinac'! &ater molec#les diff#se o#t from &ater spinac'

No response or &ron response (inference li;e '.pot'esis) 

1(c) "0NR0<<ING ARIAB<ESScore Explanation

3

Able to state !"" t$e %!&i!'"es !( t$e )et$o( to 'andle 2ariable correctl.(√) for each variable and method

M!i*u"!te( +!&i!'"e6 "oncentration of s#crose sol#tionMet'od to 'andle6 Use different concentration of s#crose

sol#tion

Res*o(i, +!&i!'"e6 'e final mass of &ater spinac' after 3 min#tes::  t'e percentae c'ane in mass

Met'od to 'andle6 meas#re and record t'e final mass of &ater spinac'after 3 min#tes b. #sin &ei'in scale::

  "alc#late t'e percentae c'ane in mass b.  #sin form#la6

%inal mass / initial mass x 1$  Initial mass 

!

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Cot&o""e( %!&i!'"e  6 ol#me of s#crose sol#tion:: time immersed for &aterspinac'

 Met'od to 'andle6 Use ! ml 2ol#me of s#crose sol#tion for

all experiment::  Used t'e same time immersin for &ater spinac' at 3

Min#tes 

! Able to state an. +/* correctl.1 Able to state an. !/3 correctl. Able to i2e onl. one response : not able to respond or &ron response

1(d) MA4ING =>?0=ESISScore Explanation

3 Able to st!te !"" t$&ee -&ite&i! -o&&e-t". based on t'e follo&in criteria6

"riteria

C1  6 State t'e manip#lated 2ariable ( concentration of s#crose sol#tion )C2  6 State t'e respondin 2ariable ( final mass of &ater spinac')R   6 State t'e relations'ip bet&een "1 and "!

Sample answer  6

7'en t'e concentration of s#crose sol#tion increases8 t'e final mass of &aterspinac' after 3 min#tes decreases

Note 6 accept &ron '.pot'esis! Able to state t'ree criteria incorrectl. or an. t&o criteria correctl.

Sample answer  6

'e different t'e concentration of s#crose sol#tion8 t'e different t'e final massof &ater spinac' after 3 min#tes

1 Able to state at idea le2el onl.

Sample ans&er 6

'e final mass of &ater spinac' is affected b. s#crose sol#tion

No response or &ron response

1(e)(i) "0MMUNI"AING S4I<<

3

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Score Explanation

3

Able to -ost&u-t ! t!'"e !( &e-o&( t'e res#lt of t'e experiment &it' t'efollo&in criteria6" 5 State all fo#r temperat#re readin (@) 5 &it' #nit 5 ransfer all data correctl. (@)

5 "alc#late t'e rate of transpiration (1:min#te) (@)  If &it'o#t #nit (x)"oncentration ofs#crose sol#tion($)

Mass of &aterspinac' ()

?ercentae c'ane in mass($)

Initial %inal! 3 * ,,+ 3 + 333, +! 3- /C*- +, + /13

! Able to constr#ct a table and record an. t&o criteria1 Able to constr#ct a table and record an. one criteria No response or &ron response

1(e)(ii) USING S?AIA< AN IME RE<AI0NS=I?Score Explanation

3Able to dra& a rap' of t'e percentae c'ane in mass of &ater spinac' aainstt'e concentration of s#crose sol#tionAxes (?) 5 bot' axis are labeled &it' #nits8 #niform scales8 independent

2ariable on 'ori9ontal axis (@)?oint (?) 5 All points are correctl. plotted (@)S'ape (S) 5 All points are connected smoot'l. (@)

  (If t'e rap' attac'es t'e axis (x)! Grap' &it' an. t&o criteria

1 Grap' &it' an. one criteria

No response or &ron response

1(f) INER?REING AAScore Explanation

3Able to state t'e concentration of s#crose sol#tion &'ic' is remain #nc'anedt'e mass of &ater spinac' strips and explain t'e relations'ip based on t'ecriteria belo&6

"riteria 6

+

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?1 6 State t'e concentration of s#crose sol#tion t'at is isotonic to t'e &aterspinac'

?! 6 Beca#se &ater molec#les diff#se into and o#t are at t'e same rate?3 6 "a#sin no more percentae c'ane in mass of &ater spinac' :: t'e &ater

spinac' strip is normal

 sample answer "oncentration of s#crose sol#tion is *+$ beca#se &ater molec#les diff#se intoand o#t are at t'e same rate ca#sin no more percentae c'ane in mass of&ater spinac' :: t'e &ater spinac' strips is normal

! Able to state t&o criterias ?1 and ?! D ?1 and ?31 Able to state one criteria ?1 No response or &ron response

1() E%INII0N 0?ERAI0NA<<>

Score Explanation3 Able to state t'e definition of Os)osis o*e&!tio!"". complete and correct8

 based on t'e follo&in criteria

"1 5 mo2ement of &ater molec#les &'ic' diff#se into or o#t from &aterspinac' t'ro#' plasma membrane"! 5 determined b. t'e final mass of &ater spinac' after 3 min#tes"3 5 percentae c'ane in mass of &ater spinac' is affected b. t'econcentration of s#crose sol#tion

 sample answer 

0smosis is t'e mo2ement of &ater molec#les &'ic' diff#se into or o#t from&ater spinac' t'ro#' plasma membrane and determined b. t'e final mass of&ater spinac' after 3 min#tes ?ercentae c'ane in mass of &ater spinac' isaffected b. t'e concentration of s#crose sol#tion

! Able to state an. t&o criteria1 Able to state an. one criteria No response or &ron response

1(') ?REI"I0NScore Explanation

3 Able to *&e(i-t t'e mass of &ater spinac' and i2e t'e reason based on t'efollo&in criteria6

"1 5 mass of &ater spinac' increase"! 5 more t'an 3 ram"3 5 beca#se distilled &ater is '.potonic sol#tion8 ca#sin more &ater todiff#se into t'e &ater spinac' b. osmosis

*

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 Mass of &ater increases more t'an 3 ram beca#se distilled &ater is'.potonic sol#tion8ca#sin more &ater to diff#se into t'e &ater spinac' b.osmosis

! Able to predict t'e mass of &ater spinac' ("1) and an. "!:"31 Able to predict t'e mass of &ater spinac'( "1)

No response or &ron response

1(i) "<ASSI%>INGScore Explanation

3

Able to classif. t'e concentration of sodi#m c'loride sol#tions &'ic' are'.potonic8isotonic and '.pertonic onto red blood cell correctl.

Sol#tionconcentration

4epe;atan<ar#tan($)

.pes of sol#tion compared to t'e osmoticconcentration of red blood cellenis lar#tan dibandin;an denan;epe;atan osmotic sel dara' mera'

1$ sodi#mc'loridesol#tion

=.potonic sol#tion

-C$ sodi#mc'loridesol#tion

Isotonic sol#tion

3$ sodi#mc'loridesol#tion

=.pertonic sol#tion

Able to classif. all t'e apparat#s and materials correctl.

! Able to classif. ! pairs correctl.1 Able to classif. 1 pair correctl.

No response or &ron response

,