Mark Schemes Summer 2009 · 17.07.2009 · Mark Schemes Summer 2009 IGCSE IGCSE Biology (4325) i Edexcel Limited. Registered in England and Wales No. 4496750 Registered Office: One90

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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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-


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-


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-


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-


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-


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-


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-


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-


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-


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)


(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-


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-


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-


BIOLOGY 4325-2H MARK SCHEME

Key





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-


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-


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;


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-


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)


(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-


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-


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-


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-


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-


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-


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-


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-


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-


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-


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-


BIOLOGY 4325-03 MARK SCHEME

Key





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-


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-


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-


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-


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-


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Documents

Mark Schemes Summer 2009 · 17.07.2009 · Mark Schemes Summer 2009 IGCSE IGCSE Biology (4325) i Edexcel Limited. Registered in England and Wales No. 4496750 Registered Office: One90