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8/20/2019 SKEMA JAWAPAN KERTAS 2.doc
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SKEMA JAWAPAN KERTAS 2
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TOTAL : 12
TOTAL : 12
2
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SECTION A
3
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Question
No
Marking Criteria Marks Total for
eac ite!
Re!arks
1(a) (i) S : Chloroplast
T : Nucleus
U : Vacuole V : Golgy apparatus Golgy !o"y
1
1
11 #a$ 3
3% & correct
' 3 ars
1% 2 correct
' 2 ars
1(a)(ii) S : Co*tai*s chlorophyll +hich a!sor!s
su*light ,or photosy*thesis T : Co*tai*s ge*etic aterial i* the ,or o,
chroosoes +hich co*trols the acti-ities
o, the cells.
1
1 #a$ 2
1(!) Vacuole U pushes the cytoplas a*" presses
the plasa e!ra*e agai*st the cell +all
1
1 #a$ 2
1 (c) /* a*ial cells0 -acuoleU is sall or a!se*t0 !ut i* pla*t cells0 -acuoleU is large 1 #a$ 1
1 (")(i) %itocho*"rio* 1
#a$ 1
1(") (ii) #eristeetic cells i* root tipsshoot tips 1 #a$ 1
1 (") (iii) #eristeetic cellsthese cells u*"ergo itosis 1 #a$ 1
Total ""
2(a) Su!strate 1
1
2(!) 1 % e*4yes spee" up the rate o, !iocheical
reactio*2%o*ly a sall aou*t o, e*4ye is *ee"e"3 %e*4yes ca* !e reuse"*ot use" up*ot
"estroye" i* the reactio* they catalyse
&%e*4yes catalyse re-ersi!le reactio*s5%a*y e*4yes are a!le to +or i* the
prese*ce o, coe*4yeco,actor
6%e*4yes are a,,ecte" !y cha*ges o,teperaturep7
1
11
11
1
A*y t+oa*s+ers.
#a$ 2
8*4yes are
speci,ic: *otaccepte"
2c(i)
&
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1
1
1
3 a$
2c(ii) Loc%e*4ye9ey %su!strate
11 2
2"(i) Col" +ater has lo+ teperature
8*4ye is *ot acti-e i* col" +ater
1
1
5
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8*4ye is acti-e at 3%&;
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&(a)(ii) A!le to e$plai* the situatio*
Saple a*s+ers: @ The cell e$pa*" a*" rupture"
81% Sali*e solutio* is hiperto*ic to the cell
sap
82% ater o-es out through ososis
1
1
1
2
/, se*te*ce is
+ater o-eoutB0
ust ha-e
through
ososis.
&(!)(i) A!le to e$plai* +hat happe* to the cell
Saple a*s+ers :
• The cell !urst haeolysis 1 1
Spelli*g o,
haeolysis
ust !e corre
&(!)(ii) A!le to gi-e the reaso* ,or the e$pla*atio*:
Saple a*s+ers:: The cell e$pa*" a*" rupture
81: The solutio* is hypoto*ic to the cell
82: ater e*tere" the cell through
ososis+ater "i,,uses i*to cell
1
1
2
#ust ha-e
throughososis.
&(c) A!le to e$plai* +hat happe* to the o*io* cell.
Saple a*s+ers:: the cell !ecoe ,lacci"
81: Sali*e solutio* is hyperto*ic to the cell
sap
82: ater o-es out ,ro the cytoplasthrough ososis
83:causi*g the plasa e!ra*e to shri*
1
1
1
1
a$ 3
#ust ha-e
through
ososis
&(") A!le to e$plai* step 1 a*" step 2
Saple a*s+ers :
Step 1• co*ce*trate" sali*e solutio* is hyperto*ic to
the cell
• +ater o-es out ,ro the cell through
ososis salt e*ter
the cell through ,acilitate" "i,,usio* acti-e
tra*sport.
Step 2
• e$cess +ater e-aporate" ,ro the cell the
,ish "rie"
(u*"er the su*)
1
1
1
#a$ 3
Step 1:
#ust ha-e
% throughososis
% through,acilitate"
"i,,usio*acti-etra*sport
Step 2:% Ca* accept i
+ithout u*"e
the su*
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• icroorga*iss ca**ot sur-i-e li-e i* "ry
co*"itio* "ecopositio* process (!yicroorga*iss) ca**ot tae
place.
1 % ca* accept i,
+ithout !yicroorga*i
Total "2
5(a) A!le to *ae the orga*sSaple a*s+ers:
> : Stoach
: Li-er = : >a*creas
S : Large i*testi*e Colo*
2
3% & correct' 2ars
1% 2 correct' 1ars
Spelli*g ust !e correct
5(!) A!le to state the ,u*ctio*s o, orga*s = a*" S
Saple a*s+ers:
= : Secretes pa*creatic uice +hich co*tai*s e*4yes
(,or "igestio* o, ,oo") Secretes aylase 0 trypsi*
a*" lipase
S : A!sor!s +ater a*" i*eral
1
1
2
B ea*s
a*other
accepte"a*s+er
Ca* accept i,
+ithout (,or
"igestio* o,,oo")
5(c) A!le to *ae the e*4yes release" !y >
>epsi* a*" =e*i* 1
1
Spelli*g ust !e correct
#ust ha-e !o
5 (") A!le to e$plai* ho+ the ileu carry out its,u*ctio*s
Saple a*s+ers:
1 % The +all o, ileu has a*y proectio*s -illus
(to a!sor! the pro"ucts o,
"igestio*)
81 % /*creases the sur,ace area ,or a!sorptio* o, pro"uct
o, "igestio*
OR
2 % Lo*g ileu
82 % /*creases the sur,ace
area ,or a!sorptio* o,
1
1
1
A*y 2
a*s+ers
2
A*y +ith 8' 1ar
D
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pro"uct o, "igestio*
OR
3 % 8phiteliu o, ileu is
o*e cell thic
83 % To allo+ Euic a!sorptio*
o, pro"uct o, "igestio*
1
5 (e) A!le to e$plai* +hy her!i-ores are a!le to
"igest pla*ts
Saple a*s+ers: % Secrete cellulase e*4ye to
"igest cellulose (i*to glucose)
8 % /* the "igesti-e syste o,
her!i-ores0 there are sy!iotic !acteria proto4oa
1
1
2
Ca* accept i,
+ithout (i*to
glucose)
5 (,) A!le to e$plai* ho+ the !oy?s !loce" !ile"uct coul" a,,ect his "igesti-e process
Saple a*s+ers: % The !ile is u*a!le to ,lo+
to the "uo"e*u
81% at ca**ot !e eulsi,ie"
!roe* i*to ti*y "roplets82% Figestio* o, ,at is slo+er
OR
83%U*a!le to pro-i"e the alali*e co*"itio* i* the "uo"e*u
8& %The pa*creatic e*4yes 8$aples
o, e*4yes are u*a!le to ,u*ctio*optially
1
1
1
1
1
3
+ith a*y pacage o,
81082 or 8308' 3 ars
No 0
+ith 81082088&
' 2 ars a
Total "2
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>hospholipi" !ilayer
6(a)
Structure o, plasa e!ra*e
1 >lasa e!ra*e is copose" o,
phospholipi" a*" protei*
2 >hospholipi" olecule has (polar) hea"+hich is hy"rophilic
3 a*" (*o*%polar) tail +hich is hy"ropho!ic
& >hospholipi" !ilayers are *ot rigi" or
static !ut ,or a "y*aic ,le$i!lestructure (that is al+ays cha*gi*g)
5 Various types o, protei*s are partiallyattache" or +holly e!e""e" i* the
e!ra*e
6 The protei* olecules ,loat a!out i* the phospholipi" !ilayer to ,or a osaic
patter* that is al+ays cha*gi*g (H,lui"?
characteristic)
7as pore protei* a*" carrier protei*
D Co*tai*s cholesterol (+hich li*s the ,atty
aci"s together)
Cholesterol helps to sta!ili4e stre*gthe*
the plasa e!ra*e (a*" ae it ore,le$i!le)
1; Car!ohy"rate chai* >olysacchari"e
chai* attache" to the sur,ace Glycoprotei* Glycolipi" ca* !e ,ou*" i*
the plasa e!ra*e
1
1
1
1
1
1
1
1
1
1
1;
ith ,igure
o*ly
' 5 ars a
Ca* accept+ithout (polar
Ca* accept+ithout *o*
polar
Ca* accept
+ithout (that
al+ays
cha*gi*g)
Carrier protei*
Glycoprotei*
>ore protei*
1;
cholesterol
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Total "#!
6(!)(i) Fiagra 6.1:1% The soil solutio* is hypoto*ic to the cell
sap o, the pla*t
2% ater "i,,uses i*to the cell !y ososis
3% Si4e o, cells i*crease&% (Vacuole e$pa*") causi*g cytoplas to
press out+ar"s agai*st the cell +all
Create turgor pressure5% The cells !ecoe turgi"0 supporti*g the
pla*t upright
Fiagra 6.2:
1 %8$cess ,ertili4ers "issol-es i* soil +ater.
2% Causes the soil solutio* to !ecoe
hyperto*ic to the cell sap o, the roots3 %ater "i,,uses out o, the roots cells to the
soil (!y ososis)
&% This cause the cells to !ecoe ,lacci" plasolyse"
5% causi*g the pla*t to +ilt.
1
1
11
1
1
1
1
1
1
A*y 3
a$ 3
A*y &
a$ &
#ust ha-e !yososis
Ca* accept i,+ithout -acuo
e$pa*"
6(!)(ii) 1 %The soil solutio* !ecoes hypoto*ic
(agai* ) copare" to the cell sap o, theroots.
2% ater "i,,uses i*to the cell sap o, the
root !y ososis.3% The cell "eplasolise" a*" (!ecoes
turgi")&% The pla*t !ecoes upright agai*
1
1
1
1
A*y 3
a$ 3
#ust ha-e !y
ososisCa* accept i,
+ithout
!ecoes turg
Total "#!
(a)(i) 1%!loo" glucose is use" !y cells to pro"uce 1
11
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e*ergy i* cell respiratio*
81%e$cess glucose is co*-erte" to glycoge*
a*" store" i* the li-er
82% the li-er co*-ert the glycoge* !ac toglucose +he* the !loo" glucose le-el is lo+
1
1
Total'3
Total $!
(a)(ii) 1% ai*o aci"s are use" to ae protei*s
e*4yes uscle cells i*corporate i*to cell
cytoplas a*" cell e!ra*e
81%ai*o aci"s are use" i* cell gro+th a*"
cell repairs
82% 8$cess ai*o aci"s ca**ot !e store"0 !utare elii*ate" i* the li-er
83%e$cess ai*o aci"s ay !e co*-erte" i*to
,ats a*" store" i* the a"ipose tissue.
1
1
1
1
Total'&
Total %!
(a)(iii) 1%Lipi"s are use" i* !uil"i*g the plasa
e!ra*e a*" other cellular structures.
81%8$cess lipi"s are store" i* the
su!cuta*eous a"ipose tissue as e*ergy reser-e,or the !o"y
82%Lipi"s are co*-erte" !ac to ,atty aci"s
a*" glycerol ,or cell respiratio* oreta!oli4e" to other su!sta*ces.
1
1
1
Total'3
Total $!
(!)(i) 1% D3;; I1;;g 2 Total'2 ithout u*it'
ar
Total 2!
(!)(ii) 1% Lea* >a To*ggol +ill "e-elop
al*utritio* co*"itio*.
1 1
81% the e*ergy gai*e" is less tha* reEuire" this
+ill lea" to ,atigue
1
12
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82%the ,i!re issi*g ,ro the "iet +hich ca*
lea" to co*stipatio*ris o, i*testi*e a*" colo*ca*cers
82% lac i* the -itai* C +hich +ill lea" to
scur-y!lee"i*g gus a*" i*ter*al orga*s
83% lac i* the -itai* J(,olic aci") +hich+ill lea" to iscarriage0 !irth "e,ects such as
spi*a !i,i"a0 cle,t lip a*" li! "e,ects o,
!a!ies i, she get arrie" i* the later year0
8&%Lac i* -itai* 8 +hich ca* cause
,atigue0 +ou*" heal slo+ly0 preature agi*g
a*" lo+ ,ertility.
1
1
1
1
#as'3
2% eati*g chips +hich is high i* salt
preser-ati-es.
81%high salts i*taes ca* lea"s to high !loo"
pressure e$pose the "igesti-e systes to the
ris o, ca*cer.
2%eati*g chocolate +hich is high co*tai* i*
sugar
81%high co*tai* o, sugar +ill lea" to "e*talcarries"ia!etes
1
1
1
1
Total'&
Total &!
13
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