mark schemes summer 2009 · 17.07.2009 · mark schemes summer 2009 igcse igcse biology (4325) i...
TRANSCRIPT
Mark Schemes Summer 2009
IGCSE
IGCSE Biology (4325)
i
Edexcel Limit ed. Regist ered in England and Wales No. 4496750 Regist ered Of f ice: One90 High Holborn, London WC1V 7BH
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visit our websit e at www.edexcel.com.
Summer 2009
Publ icat ions Code UG021452
Al l t he mat erial in t his publ icat ion is copyright
© Edexcel Lt d 2009
ii
Contents
1. 4325-1F Mark Scheme 1
2. 4325-2H Mark Scheme 14
3. 4325-03 Mark Scheme 28
iii
IGCSE BIOLOGY 4325-1F MARK SCHEME
Key
; indicat es separat e mark point s
/ indicat es al t ernat ives
eq al low for correct equivalent
__ word underl ined means no alt ernat ives al lowed
Quest ion
Number
Answer Mark
1
(a) A;
(b) A;
(c) D;
(d) B;
(e) D;
(f ) D;
(g) D;
(h) C;
(i) A;
(j ) C;
1
1
1
1
1
1
1
1
1
1
(10)
(Total 10 marks)
-1-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q2(a)
(mot or) neurone / nerve (cel l );
(1)
Quest ion
Number
Answer Mark
4325 1F Q2(b)(i)
nucleus;
(1)
Quest ion
Number
Answer Mark
4325 1F Q2(b)(ii)
arrow f rom cel l body;
(1)
Quest ion
Number
Answer Mark
4325 1F Q2(c)
blood / chemical / slower / longer last ing / eq. ; ;
Al low converse
Max 2
(2)
(Total 5 marks)
-2-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q3(a)
increased t emp;
increased CO2 ;
increased l ight ;
increased humidit y;
increased phot osynt hesis;
Max 3
(3)
Quest ion
Number
Answer Mark
4325 1F Q3(b)
more nit rat es / nit rogen;
prot ein / amino acids;
growt h;
ot her named mineral eg Mg;
funct ion of mineral eg chlorophyl l ;
Rej ect : nut rient s
Max 2
(2)
Quest ion
Number
Answer Mark
4325 1F Q3(c)(i)
choose parent s / organism;
desired charact erist ics eg st em lengt h / increased yield;
breed / mat e;
choose of fspring;
repeat ;
Max 3
(3)
Quest ion
Number
Answer Mark
4325 1F Q3(c)(ii)
milk yield / meat product ion / eq;
(1)
(Total 9 marks)
-3-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q4(a)(i)
ant her / st amen;
st igma;
pet al ;
(3)
Quest ion
Number
Answer Mark
4325 1F Q4(a)(ii)
large pet als / coloured pet als;
enclosed ant hers/ st amens;
enclosed st igma;
Max 2
(2)
Quest ion
Number
Answer Mark
4325 1F Q4(b)
t ransfer of pol len;
by insect / wind / eq;
f rom ant her t o st igma;
Max 2
(2)
(Total 7 marks)
-4-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q5(a)(i)
wat er;
carbon dioxide;
oxygen;
(3)
Quest ion
Number
Answer Mark
4325 1F Q5(a)(ii)
absorb / t rap l ight / eq;
(1)
Quest ion
Number
Answer Mark
4325 1F Q5(b)
dest arch plant / eq;
place in l ight ;
put in boil ing/ hot wat er;
(boil in) et hanol;
add iodine;
blue / black;
Max 4
(4)
(Total 8 marks)
-5-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q6(a)
Enzyme large molecule broken
down
small molecule
produced
Amylase Starch; Maltose;
Protease; Prot eins amino acids;
Lipase Lipid; fatty acids;
(6)
(Total 6 marks)
-6-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q7(a)
Wat er / damp;
oxygen;
warmt h / t emperat ure;
(al low) l ight ;
Max 2
(2)
Quest ion
Number
Answer Mark
4325 1F Q7(b)
5;
(1)
Quest ion
Number
Answer Mark
4325 1F Q7(c)(i)
t o produce clear beer / t o remove debris / eq;
(1)
Quest ion
Number
Answer Mark
4325 1F Q7(c)(ii)
t o ki l l microorganisms / st eri l ise / st op ferment at ion / eq;
(1)
(Total 5 marks)
-7-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q8
st ruct ure
organism
chloroplast s
cyt oplasm
cel l wal l
nucleus
fungus
X
/
/ ;
(/ )
bact erium
(X)
/ ;
(/ )
(X)
virus
X;
(X)
(X)
X;
(4)
(Total 4 marks)
-8-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q9(a)
low in numbers / r isk of ext inct ion / r isk of dying out / eq;
(1)
Quest ion
Number
Answer Mark
4325 1F Q9(b)
j el lyf ish in cent re;
arrows correct ;
(2)
Quest ion
Number
Answer Mark
4325 1F Q9(c)(i)
higher t emp reduces t ime t o hat ch / eq;
(1)
Quest ion
Number
Answer Mark
4325 1F Q9(c)(ii)
30 0C; Accept wit hin a range of 29.9 – 30.1
(1)
Quest ion
Number
Answer Mark
4325 1F Q9(d)(i)
29 0C; Accept wit hin a range of 28.9 – 29.1
(1)
Quest ion
Number
Answer Mark
4325 1F Q9(d)(ii)
24;
96;
(al low one mark for 80:20 or for 96/ 24 wrong way round)
(2)
Quest ion
Number
Answer Mark
4325 1F Q9(e)(i)
eggs hat ch early / eq;
less developed (premat ure idea) / less t ime t o develop / eq;
fewer males / eq;
less mat ing / less reproduct ion / eq;
(2)
Quest ion
Number
Answer Mark
4325 1F Q9(e)(ii)
less burning / less combust ion;
(of ) fossil fuel / named fossil fuel; accept pet rol
grow more t rees / reduce deforest at ion;
increase phot osynt hesis;
cycle / walk / less cars / reduce elect ricit y use / recycle /
wind / t idal / nuclear / renewable / eq;
Ignore aerosols, ref t o fact ories, pol lut ion
(3)
(Total 13 marks)
-9-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q10(a)(i)
vena cava;
aort a;
(2)
Quest ion
Number
Answer Mark
4325 1F Q10(a)(ii)
lef t vent ricle;
(1)
Quest ion
Number
Answer Mark
4325 1F Q10(a)(iii)
(blood) t o t he lung / alveol i;
col lect oxygen / deoxygenat ed / release carbon dioxide;
(2)
Quest ion
Number
Answer Mark
4325 1F Q10(b)
blockage or narrowing / eq;
by fat / fat t y deposit / cholest erol / eq;
in art eries / coronary art ery / aort a / blood vessels;
less oxygen / less glucose;
anaerobic respirat ion;
lact ic acid;
heart at t ack / heart disease / angina / eq;
nicot ine / carbon monoxide;
increased heart rat e / high blood pressure / make heart work
harder;
(5)
(Total 10 marks)
-10-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q11(a)
increases / eq;
levels / st ays at 120 / st ops increasing / const ant / eq;
(2)
Quest ion
Number
Answer Mark
4325 1F Q11(b)
100; ;
(one for 60 and 120 in working however expressed)
(2)
Quest ion
Number
Answer Mark
4325 1F Q11(c)(i)
anaerobic respirat ion;
(1)
Quest ion
Number
Answer Mark
4325 1F Q11(c)(ii)
more oxygen / repay oxygen debt ;
(more aerobic) respirat ion / less anaerobic respirat ion;
(2)
Quest ion
Number
Answer Mark
4325 1F Q11(d)
heat loss / cool / dehydrat ion / maint ain body t emperat ure;
increase heart rat e / eq;
blood vessels get wider / vasodilat ion;
(3)
(Total 10 marks)
-11-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q12(a)
Plant part Stimulus Response
(st em) (l ight ) (posit ive
phot ot ropism)
(root ) (l ight ) negat ive
phot ot ropism;
St em / shoot ; gravit y; (negat ive
geot ropism)
(3)
Quest ion
Number
Answer Mark
4325 1F Q12(b)
obt ain l ight ;
phot osynt hesis;
make glucose / sugar / carbohydrat e;
for growt h / energy;
(2)
(Total 5 marks)
-12-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 1F Q13(a)
nucleus;
empt y / enucleat ed; Ignore unfert i l ised
mit osis;
embryo;
ut erus / womb;
same / ident ical; Ignore similar
(6)
Quest ion
Number
Answer Mark
4325 1F Q13(b)
Animal Sex chromosomes
CopyCat ’ s mot her (XX)
The surrogat e mot her XX;
Copycat XX;
(2)
(Total 8 marks)
PAPER TOTAL 100 MARKS
-13-
4325 IGCSE Biology Summer 2009
BIOLOGY 4325-2H MARK SCHEME
Key
; indicat es separat e mark point s
/ indicat es al t ernat ives
eq al low for correct equivalent
__ word underl ined means no alt ernat ives al lowed
Quest ion
Number
Answer Mark
4325 2H Q1
st ruct ure
organism
chloroplast s
cyt oplasm
cel l
wal l
nucleus
fungus
X
/
/ ;
(/ )
bact erium
(X)
/ ;
(/ )
(X)
virus
X;
(X)
(X)
X;
(4)
(Total 4 marks)
-14-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q2(a)
low in numbers / r isk of ext inct ion / r isk of dying out / eq;
(1)
Quest ion
Number
Answer Mark
4325 2H Q2(b)
j el lyf ish in cent re;
arrows correct ;
(2)
Quest ion
Number
Answer Mark
4325 2H Q2(c)(i)
higher t emp reduces t ime t o hat ch / eq;
(1)
Quest ion
Number
Answer Mark
4325 2H Q2(c)(ii)
30 (0C); Accept wit hin a range of 29.9-30.1
(1)
Quest ion
Number
Answer Mark
4325 2H Q2(d)(i)
29 (0C); Accept wit hin a range of 28.9-29.1
(1)
Quest ion
Number
Answer Mark
4325 2H Q2(d)(ii)
24;
96;
(al low one mark for 96 24 / 20:80/ eq)
(2)
Quest ion
Number
Answer Mark
4325 2H Q2(e)(i)
eggs hat ch early / eq;
less developed (premat ure idea) / less t ime t o develop / eq;
OR if graph (d) used
fewer males / eq; rej ect no males
less mat ing / less reproduct ion / eq;
(2)
Quest ion
Number
Answer Mark
4325 2H Q2(e)(ii)
less burning / less combust ion;
(of ) fossil fuel / named fossil fuel;
grow more t rees / reduce deforest at ion;
increase phot osynt hesis;
cycle / walk / less cars / reduce elect ricit y use / recycle /
wind / t idal / nuclear / renewable / eq;
Ignore aerosols, ref t o fact ories, pol lut ion
(3)
(Total 13 marks)
-15-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q3(a)(i)
vena cava;
aort a;
(2)
Quest ion
Number
Answer Mark
4325 2H Q3(a)(ii)
lef t vent ricle;
(1)
Quest ion
Number
Answer Mark
4325 2H Q3(a)(iii)
(blood) t o lung / alveol i;
obt ain oxygen / oxygenat ed / release carbon dioxide/ de
oxygenat ed eq;
(2)
Quest ion
Number
Answer Mark
4325 2H Q3(b)
blockage / narrowing;
blood vessels / art eries / coronary art ery / aort a;
fat / fat t y deposit / cholest erol ;
less oxygen / less glucose;
anaerobic respirat ion;
lact ic acid;
heart at t ack / heart disease / angina/ heart st ops / eq;
nicot ine / carbon monoxide;
increased heart rat e / high blood pressure / make heart work
harder;
(5)
(Total 11 marks)
-16-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q4(a)
increases / eq;
levels / st ays at 120 / st ops increasing / const ant / eq;
(2)
Quest ion
Number
Answer Mark
4325 2H Q4(b)
100;
(one for 60 and 120 in working however expressed)
(2)
Quest ion
Number
Answer Mark
4325 2H Q4(c)(i)
anaerobic respirat ion;
(1)
Quest ion
Number
Answer Mark
4325 2H Q4(c)(ii)
(more) oxygen / repay oxygen debt ;
(more) (aerobic) respirat ion / less anaerobic respirat ion;
(2)
Quest ion
Number
Answer Mark
4325 2H Q4(d)
heat loss / cool / dehydrat ion / maint ain body t emp. / eq;
increase heart rat e;
blood vessels get wider / vasodilat ion;
(3)
(Total 10 marks)
-17-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q5(a)
Plant part Stimulus Response
(st em) (l ight ) (posit ive
phot ot ropism)
(root ) (l ight ) negative
phototropism;
stem/ shoot; gravity; (negat ive
geot ropism)
(3)
Quest ion
Number
Answer Mark
4325 2H Q5(b)
obt ain l ight ;
phot osynt hesis;
make glucose / sugar / st arch / carbohydrat e;
(2)
(Total 5 marks)
-18-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q6(a)
nucleus;
empt y / enucleat ed/ eq; Ignore unfert i l ised
mit osis;
embryo;
ut erus / womb;
ident ical / same; Ignore similar
(6)
Quest ion
Number
Answer Mark
4325 2H Q6(b)
Animal Sex chromosomes
CopyCat ’ s mot her (XX)
The surrogat e mot her XX;
Copycat XX;
(2)
(Total 8 marks)
-19-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q7(a)(i)
ant hers/ f i lament / st amen out side ‘ f lower’ ;
st igma / st yle out side ‘ f lower’ / feat hery/ eq; Ignore carpel
(2)
Quest ion
Number
Answer Mark
4325 2H Q7(a)(ii)
l ight / smal ler / air sacs / larger quant it ies / smoot h / large SA
eq ;
Accept negat ive converse eg not l ight / not st icky / eq:
Accept converse if clearly insect pol l inat ed
(1)
Quest ion
Number
Answer Mark
4325 2H Q7(b)(i)
shape (oblong wit h an ext ension);
cel l label led wit h at least two f rom nucleus, membrane,
cel l wal l , cyt oplasm, vacuole;
max one if general ised cel l
(2)
Quest ion
Number
Answer Mark
4325 2H Q7(b)(ii)
osmosis; Ignore act ive t ransport
high conc of wat er t o low conc of wat er / eq;
select ively permeable membrane / eq;
(2)
(Total 7 marks)
-20-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q8(a)(i)
F;
(1)
Quest ion
Number
Answer Mark
4325 2H Q8(a)(ii)
emulsif ies / emulsif icat ion / smal l drops;
l ipid / fat / oi l ;
large surface area;
enzymes / l ipase;
neut ral ise acid / raise pH / opt imum / alkal ine / eq;
Max 4
(4)
Quest ion
Number
Answer Mark
4325 2H Q8(b)(i)
small int est ine / i leum / C;
(1)
Quest ion
Number
Answer Mark
4325 2H Q8(b)(ii)
large surface area / microvil l i ;
capil laries;
blood moves/ circulates / eq;
maint ain concent rat ion gradient ;
wal ls single cel l t hick / t hin wal ls / short dist ance /
(capil laries) close t o wal l ;
lact eal / lymph vessel;
dif fusion;
Max 4
(4)
(Total 10 marks)
-21-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q9(a)(i)
parent s: Nn and Nn;
gamet es: N and n and N and n; (gap, or, comma, circled must
be visible)
of fspring: NN and Nn and Nn and nn;
phenot ypes no PKU, no PKU, no PKU and PKU;
Al low not af fect ed/ af fect ed / normal / abnormal eq
Al low t erm carrier for Nn
ECF 3 max
(4)
Quest ion
Number
Answer Mark
4325 2H Q9(a)(ii)
¾ / 3:1 / 75% / 3 in 4 / 0.75 / eq;
No ECF
(1)
Quest ion
Number
Answer Mark
4325 2H Q9(b)
diet lacking phenylalanine / dialysis / removal of
phenylalanine / eq rest rict / reduce prot ein in diet / gene
t herapy / eq ;
(1)
(Total 6 marks)
-22-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q10(a)
wat er t ransport / wat er absorpt ion;
t urgidit y/ support / eq
mineral / sal t t ransport / absorpt ion / ; Ignore nut rient s
cool ing;
Max 1
(1)
Quest ion
Number
Answer Mark
4325 2H Q10(b)
st omat a / pores open;
increase (t ranspirat ion) / more wat er loss / eq;
(2)
(Total 3 marks)
-23-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q11(a)(i)
shape;
(3 bars reducing in size f rom bot t om t o t op) al low smoot h
order; (t rees t hen primary consumers t hen secondary
consumers)
names; (regardless of posit ion)
(3)
Quest ion
Number
Answer Mark
4325 2H Q11(a)(ii)
bot t om bar small(er) / f ewer t rees / invert ed pyramid / eq;
(1)
Quest ion
Number
Answer Mark
4325 2H Q11(b)
energy lost / used up / respirat ion / heat / movement / excret ion
/ egest ion / uneat en / indigest ible / deat h / eq; ; ; ;
(4)
Quest ion
Number
Answer Mark
4325 2H Q11(c)(i)
t rees/ leaves/ canopy block sun / l ight ;
(1)
Quest ion
Number
Answer Mark
4325 2H Q11(c)(ii)
chlorophyl l ;
(absorb) l ight ;
phot osynt hesis;
(2)
Quest ion
Number
Answer Mark
4325 2H Q11(c)(iii)
feeds on dead mat erial / carnivorous / parasit ic / ref t o
ot her pigment s / eq;
(1)
(Total 10 marks)
-24-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q12(a)(i)
st i l l grows in cold / longer growing period / 2 crops per year
/ survive f rost / wint er / eq;
(1)
Quest ion
Number
Answer Mark
4325 2H Q12(a)(ii)
no infect ion / disease / not ki l led / eq;
bet t er growt h / yield / eq; Ignore help growt h
no fungus spread t o ot her plant s / eq;
(2)
Quest ion
Number
Answer Mark
4325 2H Q12(b)
gene / DNA / al lele;
cut / eq;
rest rict ion (endonuclease) enzyme;
plasmid;
same rest rict ion (endonuclease);
l igase;
j oin / st ick / glue / eq;
recombinant DNA;
vect or;
Agrobact erium / gene gun / virus;
(5)
Quest ion
Number
Answer Mark
4325 2H Q12(c)
more plant s / lot s of plant s / eq;
quicker / fast er / eq;
same / ident ical / clones/ al l have desired charact erist ic / eq;
NB Ignore numbering: if t wo correct in 1. give t wo marks
Ignore cost
(2)
(Total 10 marks)
-25-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q13(a)
insul in
pancreas;
blood;
l iver;
glycogen;
(5)
Quest ion
Number
Answer Mark
4325 2H Q13(b)(i)
glucose normal / lower glucose level / glucose level only due
t o drink / food cont ains glucose / eq;
(1)
Quest ion
Number
Answer Mark
4325 2H Q13(b)(ii)
st art ing / fast ing level is wit hin normal l imit s / eq;
blood glucose level does not r ise above 9 / r ises t o 8;
blood glucose level fal ls (t o normal levels);
insul in released;
al low converse for each point
Max 3
(3)
(Total 9 marks)
-26-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4325 2H Q14(a)(i)
Iceland and Japan;
(1)
Quest ion
Number
Answer Mark
4325 2H Q14(a)(ii)
13; ;
al low one for 130 or 100 and 30 in working
(2)
Quest ion
Number
Answer Mark
4325 2H Q14(a)(iii)
amino acids / new cel ls / enzymes / t issues / muscle/ bone/
repair / membranes/ DNA / hormones/ ant ibodies/ eq;
(1)
Quest ion
Number
Answer Mark
4325 2H Q14(b)(i)
remove wast e / faeces / urine / eq;
Ignore clean / disease / pol lut ion
oxygen / prevent st agnat ion / eq;
respirat ion;
Max 2
(2)
Quest ion
Number
Answer Mark
4325 2H Q14(b)(ii)
less wast ed / al l eat en / prevent oxygen deplet ion / less
decomposit ion / less bact erial growt h / eq;
(1)
Quest ion
Number
Answer Mark
4325 2H Q14(c)
large f ish / more growt h / eq;
f rom small amount of food / eq;
economic benef it / eq;
Max 2
(2)
Quest ion
Number
Answer Mark
4325 2H Q14(d)
(Int raspecif ic compet it ion):
no overcrowding / increase cage size / eq;
separat e sizes/ ages; Ignore gender
supply enough food; (ONCE)
(Int erspecif ic compet it ion):
one species / t ype of f ish per cage / st op ot her f ish ent ering
cage;
(by) cover cage / size of mesh / use dif ferent cages / eq;
eg separat ing species in dif ferent pens/ cages = 2
Max 4
(4)
(Total 10 marks)
PAPER TOTAL 120 MARKS
-27-
4325 IGCSE Biology Summer 2009
BIOLOGY 4325-03 MARK SCHEME
Key
; indicat es separat e mark point s
/ indicat es al t ernat ives
eq al low for correct equivalent
__ word underl ined means no alt ernat ives al lowed
Quest ion
Number
Answer Mark
1(a)(i N) ame of apparatus Letter of apparatus
Bunsen burner D;
Tripod C;
Crucible A;
Gauze B;
(4)
Quest ion
Number
Answer Mark
1(a)(ii) prot ect eyes / eq;
(1)
Quest ion
Number
Answer Mark
1(b) oven /
t ime /
(2)
dryer / heat / in dry area / drying agent / eq;
unt i l const ant mass / leave longer (unt i l dry);
Quest ion
Number
Answer Mark
1(c) 5.0; ; o
(2)
ne mark in working for 2.0 – 1.9 or 0.1
Quest ion
Number
Answer Mark
1(d)(i 2.4 / s
(1)
) ample 5 for sandy beach;
Quest ion
Number
Answer Mark
1(d)(i seawe n
wit h ot he
(1)
i) ed / (more) plant s / dog faeces / human error / confusio
r samples / st i l l wet / eq;
Quest ion
Number
Answer Mark
1(d)(i (more)
(1)
ii) leaves / idea of more plant s;
(Total 12 marks)
-28-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
2(a) f inger
wat ch
(2)
on wrist / neck/ pressure point / use inf lat ed cuf f idea;
/ clock / eq;
Quest ion
Number
Answer Mark
2(b)(i) names of four st udent s;
pulse / heart rat e / bpm;
rest + 10 (sit ups) + 20 (sit ups);
correct values in t able;
(4)
Quest ion
Number
Answer Mark
2(b)(i oxygen
glucos
respira
ATP /
muscle
m )
i) ;
e;
t ion;
energy;
s / cel ls / t issues; Ignore body ax (3
Quest ion
Number
Answer Mark
(c) More accurat e / closer t o t rue value / eq;
heart rat e slows / eq; Al low converse eg higher in f irst 15s
less chance of (count ing) error / eq;
max (2)
2
l 11 marks)
(Tota
-29-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
(a) S scale at least half of each axis + l inear;
L l ine st ra point s;
A axes
A label led c
P poin
(5)
3
ight + t hrough
correct ;
onc (%) + t ime (s);
t s plot t ed accurat ely; ;
Quest ion
Number
Answer Mark
as enz n decreases;
Al low converse
Rej ect as t ime increases conc. decreases
(1)
3(b)(i) yme conc. increases t ime t ake
Quest ion
Number
Answer Mark
3(b)(ii) breakd isions;
l iquid/ t ery/ runny / more soluble / eq;
(2)
own/ digest ion (prot ein/ past e) / more col l
f luid/ wa
Quest ion
Number
Answer Mark
3(c) r / volumet emperat ure / pH / t ime of mixing / t ime t o pou of
me) solut ion / size of funnel; ; Ignore mass of
past e
(2)(enzy
j el ly/
Quest ion Answer Mark
Number
3(d) 0.5 200cm3 / eq;
volume of wat er / eq;
(1)
g in 100 cm3 / 1g in
or
t ake st at ed volume of 1.00 % solut ion + add same st at ed
(Total 11 marks)
-30-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
4(a)(i) Type of animal Tally Total number
caught
Ant IIIII III 8
Bee IIIII IIII IIIII t le I IIIII 20
Slug IIIII III 8
Spider IIII 4
W se I oodlou IIII IIIII IIIII IIIII II 22
t a mber t ransfer
(6)
l ly ; ; ; ; ; nu ;
Quest ion
Number
Answer Mark
4(a)(ii) used 10 t raps / repeat ed t rapping / many t raps / eq;
(1)
Quest ion
Number
Answer Mark
at night : wet / less risk of drying out / eq;
dat ors / eq;
food / prey / feed / eq;
4(a)(iii)
avoid pre
more
cool / eq;
hard t o see t rap; Ignore more act ive (2)
Quest ion
Number
Answer Mark
4(b) (yes) d
dead carnivores cannot eat ot her animals;
or
(no) adverse reason for ki l l ing eg cruel / not an /
u /
put of f by det ergent / eq;
ead animals cannot escape /
r ight / inhum
nnecessary / disrupt food chain / cannot escape (1)
marks)
(Total 11
-31-
4325 IGCSE Biology Summer 2009
Quest ion
Number
Answer Mark
C seeds sown at dif ferent dist ances apart ;
O same species of seed / same age / eq;
repeat ; Ignore many seeds at each dist ance
t / no of leaves / eq;
+ S2 nut rient s /
)
5
R
M1 (growt h measured) mass / lengt h / heigh
2 ref t o t ime; M
1 same LI / wat er / soil / t emperat ure / fert i l iser /S
pH / eq; ;
(6
KS
(Total 6 marks)
PAPER TOTAL 50 MAR
-32-
4325 IGCSE Biology Summer 2009
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