specimen (ial) ms - unit 2 edexcel biology.pdf

Pearson Edexcel International © Pearson Education Limited 2013 Sample Assessment Materials Advanced Level in Biology

71

General marking guidance x All candidates must receive the same treatment. Examiners must mark the

first candidate in exactly the same way as they mark the last. x Mark schemes should be applied positively. Candidates must be rewarded for

what they have shown they can do rather than penalised for omissions. x Examiners should mark according to the mark scheme not according to their

perception of where the grade boundaries may lie. x There is no ceiling on achievement. All marks on the mark scheme should be

used appropriately. x All the marks on the mark scheme are designed to be awarded. Examiners

should always award full marks if deserved, i.e. if the answer matches the mark scheme. Examiners should also be prepared to award zero marks if the candidate’s response is not worthy of credit according to the mark scheme.

x Where some judgement is required, mark schemes will provide the principles by which marks will be awarded and exemplification may be limited.

x When examiners are in doubt regarding the application of the mark scheme to a candidate’s response, the team leader must be consulted.

x Crossed-out work should be marked UNLESS the candidate has replaced it with an alternative response.

x Mark schemes will indicate within the table where, and which strands of Quality of Written Communication, are being assessed. The strands are as follows:

i. ensure that text is legible and that spelling, punctuation and grammar are accurate so that meaning is clear

ii. select and use a form and style of writing appropriate to purpose and to complex subject matter

iii. organise information clearly and coherently, using specialist vocabulary when appropriate.


72

Using the Mark Scheme

Examiners should NOT give credit for incorrect or inadequate answers, but allow candidates to be rewarded for answers showing correct application of principles and knowledge. Examiners should therefore read carefully and consider every response: even if it is not what is expected, it may still be creditworthy. The mark scheme gives examiners: x an idea of the types of response expected x how individual marks are to be awarded x the total mark for each question x examples of responses that should NOT receive credit. / Means that the responses are alternatives and either answer

should receive full credit. () Means that a phrase/word is not essential for the award of the

mark, but helps the examiner to get the sense of the expected answer.

Bold Phrases/words in bold indicate that the meaning of the phrase or the actual word is essential to the answer.

ecf/TE/cq (error carried forward)(transfer error)(consequential) means that a wrong answer given in an earlier part of a question is used correctly in answer to a later part of the same question.

Candidates must make their meaning clear to the examiner to gain the mark. Do not give credit for correct words/phrases which are put together in a meaningless manner. Answers must be in the correct context. Quality of Written Communication Questions that involve the writing of continuous prose require candidates to: x write legibly, with accurate use of spelling, grammar and punctuation in

order to make the meaning clear x select and use a form and style of writing appropriate to purpose and to

complex subject matter x organise information clearly and coherently, using specialist vocabulary

when appropriate. Full marks will be awarded if the candidate has demonstrated the above abilities. Questions where Quality of Written Communication is likely to be particularly important are indicated (Quality of Written Communication) in the mark scheme, but this does not preclude others.


73

Qu

esti

on

Nu

mb

er

An

swer

M

ark

1(a

) C

(1)

Qu

esti

on

Nu

mb

er

An

swer

M

ark

1(b

) D

(1

) Q

ues

tion

N

um

ber

A

nsw

er

Mar

k

1(c

)A

(1)

Qu

esti

on

Nu

mb

er

An

swer

M

ark

1(d

) D

(1

) Q

ues

tion

N

um

ber

A

nsw

er

Mar

k

1(e

)C

(1)

Qu

esti

on

Nu

mb

er

An

swer

M

ark

1(f

) D

(1

) Q

ues

tion

N

um

ber

A

nsw

er

Mar

k

1(g

) D

(1

) Q

ues

tion

N

um

ber

A

nsw

er

Mar

k

1(h

)C

(1)

To

tal

for

Qu

esti

on 1

= 8

Mar

ks


74

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

*2

(a)

Qu

alit

y of

W

ritt

en

Com

mu

ni

cati

on

(Qua

lity

of W

ritt

en C

omm

unic

atio

n –

spel

ling

of

tech

nica

l ter

ms

mus

t be

cor

rect

and

the

ans

wer

m

ust

be o

rgan

ised

in a

logi

cal s

eque

nce.

) 1.

Spe

rm c

ell {

fuse

s/eq

} w

ith e

gg c

ell (

mem

bran

e)

2.Ref

eren

ce t

o {c

ortic

algr

anul

es/v

esic

les/

lyso

som

es}

3.Id

ea o

f (c

ortic

al g

ranu

les)

{m

ovin

g to

war

ds/f

usin

g w

ith}

egg

cell

(sur

face

) m

embr

ane

4.Ref

eren

ce t

o ex

ocyt

osis

(of

cor

tical

gran

ules

/ves

icle

s/ly

soso

mes

) 5.

Idea

of co

nten

ts (

of c

ortic

al g

ranu

les)

{se

cret

ed

/rel

ease

d in

to jel

ly la

yer/

eq}

OR r

efer

ence

to

cort

ical

rea

ctio

n 6.

Idea

of

{har

deni

ng/t

hick

enin

g/eq

} o

f {z

ona

pellu

cida

/jel

ly la

yer}

OR f

orm

atio

n of

fer

tilis

atio

n m

embr

ane

7.Ref

eren

ce t

o ch

ange

in c

harg

e ac

ross

egg

cel

l m

embr

ane

Qua

lity

of W

ritt

en C

omm

unic

atio

n em

phas

is is

on

spel

ling

of t

echn

ical

ter

ms.

1.

NO

T th

e fu

sion

of

the

nucl

ei

4.N

OT

for

acro

som

e re

actio

n 5.

ACCEP

T en

zym

es/c

hem

ical

s N

OT

rele

ased

into

ovu

m

6. A

CCEP

T fe

rtili

satio

n

(4)


75

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

2(b

) 1.

Ref

eren

ce t

o bo

th {

inde

pend

ent/

rand

om}

asso

rtm

ent

and

{cro

ssin

g-ov

er/c

hias

ma(

ta)}

2.In

depe

nden

t as

sort

men

t gi

ves

rise

to

{new

/ di

ffer

ent/

eq}

com

bina

tions

of (p

ater

nal a

nd

mat

erna

l) c

hrom

osom

es

3.

Cro

ssin

g ov

er in

volv

es s

wap

ping

of {s

ectio

ns/e

q}

of {

chro

mat

ids/

chro

mos

omes

}

3.N

OT

swap

ping

gen

es

ACCEP

T ne

w c

ombi

natio

ns o

f al

lele

s (o

n a

chro

mos

ome)

/rec

ombi

nant

s

(2)

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

2(c

)(i)

1.

Idea

tha

t te

mpe

ratu

re is

a c

ontr

olle

d va

riab

le,

e.

g. c

onst

ant

tem

pera

ture

rem

oves

thi

s va

riab

le,

so t

empe

ratu

re d

oes

not

affe

ct {

resu

lts/l

engt

h of

po

llen

tube

} 2.

Idea

tha

t (p

olle

n tu

be)

{gro

wth

/enz

ymes

/pro

tein

s/eq

} af

fect

ed b

y te

mpe

ratu

re

3.Id

ea t

hat

at t

his

tem

pera

ture

{en

zym

es/p

rote

ins}

w

ill n

ot b

e de

natu

red/

polle

n no

t de

stro

yed

at t

his

tem

pera

ture

/22.

5°C

opt

imum

tem

pera

ture

4.

Idea

tha

t th

e in

vest

igat

ion

is v

alid

1.ACCEP

T th

e id

ea o

f on

ly c

hang

ing

one

vari

able

an

d ke

epin

g al

l the

oth

ers

cons

tant

– o

r so

tha

t on

ly m

ethy

lpur

ine

affe

ctin

g po

llen

tube

s N

OT

cont

rol v

aria

ble

4.N

OT

relia

ble

IGN

ORE

fair

tes

t, a

ccur

ate,

pre

cise

(2)


76

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al g

uid

ance

M

ark

2(c

)(ii

) 1.

Idea

of

{no

sign

ifica

nt/s

mal

l/1m

m/e

q} in

crea

se in

{m

ean

leng

th/g

row

th}

up t

o 0.

0001

mol

dm

-3

2.Id

ea o

f ne

gativ

e co

rrel

atio

n de

scribe

d, e

.g.

{dec

reas

e in

leng

th o

f/sh

orte

r/re

duce

d gr

owth

of}

po

llen

tube

s as

con

cent

ratio

n in

crea

sed

OR o

ver

stat

ed r

ange

fro

m 0

.000

1 to

0.0

1 3.

Idea

of

grea

test

{ch

ange

/dro

p/eq

} be

twee

n 0.

0010

and

0.0

100

mol

dm

-3/e

q 4.

Cre

dit

corr

ect

man

ipul

atio

n of

the

dat

a to

illu

stra

te

decr

ease

IGN

ORE

units

. 2.

ACCEP

T re

fere

nce

to d

ecre

ases

at

spec

ific

conc

entr

atio

ns o

f m

ethy

lpur

ine

IGN

ORE

nega

tive

corr

elat

ion

unqu

alifi

ed

3.

NO

T re

fere

nces

to

rapi

d de

crea

se

4.Som

e ex

ampl

es g

iven

bel

ow

Con

c. c

hang

e

Diff

eren

ce

(mm

) %

all

dec

reas

es

0.00

00 –

0.

0100

– m

p2

(94-

28)

66

70/7

0.2

%

0.00

01 –

0.

0100

(9

5-28

) 67

71

/70.

5 %

0.00

01 –

0.

0010

(9

5-90

) 5

5/

5.3

%

0.00

10 –

0.

0100

– m

p3

(90-

28)

62

69/6

8.9

%

(3)


77

To

tal f

or Q

ues

tion

2 =

13

Mar

ks

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

2(c

)(ii

i)

1.{L

ess/

no}

tran

script

ion/

idea

of in

hibi

tion

of R

NA

poly

mer

ase

2.{L

ess/

no}

{tra

nsla

tion/

prot

ein

synt

hesi

s/pr

otei

n m

ade/

eq}

3.Id

ea t

hat

prot

ein

need

ed f

or (

polle

n tu

be)

grow

th,

e.g.

less

pro

tein

lead

s to

red

uced

gro

wth

(of

pol

len

tube

s)

2 an

d 3

AC

CEP

T re

fere

nce

to e

nzym

e in

stea

d of

pr

otei

n.

IGN

ORE

repa

ir.

(2)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

3(a

)

Des

crip

tion

of

stag

e Ti

ck/

cr

oss

He

trie

d to

isol

ate

digi

talis

fr

om fox

glov

e pl

ants

. 3

He

test

ed d

igita

lis o

n he

alth

y hu

man

s.

×

He

used

a p

lace

bo t

o m

ake

sure

dig

italis

wor

ked.

×

No

mar

ks for

bla

nk s

pace

s.

No

mar

k fo

r hy

brid

x/3

.

(3)


78

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

3(b

)(i)

1.

Inac

tive

subs

tanc

e/no

dru

g/eq

2.

Idea

tha

t it

is u

sed

as a

con

trol

, e.

g. c

ompa

riso

n w

ith t

he a

ctua

l dru

g 3.

Idea

of

psyc

holo

gica

l eff

ect

of t

akin

g ei

ther

a d

rug

or a

pla

cebo

1.ACCEP

T du

mm

y pi

ll, s

ugar

pill

, fa

ke p

ill

3.Fo

r ex

ampl

e pa

tient

bel

ieve

s th

ey w

ill im

prov

e an

d ALL

OW

ref

eren

ce t

o pl

aceb

o ef

fect

(2)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

3(b

)(ii

) 1.

Idea

of

one

set

of p

atie

nts

bein

g gi

ven

the

(new

) dr

ug a

nd o

ne s

et g

iven

a p

lace

bo

2.N

eith

er p

atie

nt n

or {

doct

or/s

cien

tist/

eq}

know

s if

the

trea

tmen

t co

ntai

ns t

he (

new

) dr

ug o

r no

t 3.

Rem

oval

of bi

as fro

m r

esul

ts/e

q

1.ACCEP

T fo

r pl

aceb

o pr

e-ex

istin

g/ol

d dr

ug

(2)

To

tal

for

Qu

esti

on 3

= 7

Mar

ks


79

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

4(a

) 1.

Idea

of us

ing

part

of th

e se

edlin

g 2.

Idea

of us

ing

agar

3.

(Aga

r co

ntai

ns)

grow

th s

ubst

ance

s/ho

rmon

es/e

q 4.

Idea

of us

ing

asep

tic t

echn

ique

5.

Idea

of co

veri

ng t

he t

op o

f th

e co

ntai

ner

to p

reve

nt

cont

amin

atio

n O

R lo

ss o

f w

ater

6.

Idea

of su

pply

ing

light

7.

Allo

w a

sui

tabl

e le

ngth

of tim

e fo

r gr

owth

, e.

g. 1

to

6 w

eeks

8.

Look

for

{ro

ots/

leav

es/(

com

plet

e) p

lant

} fo

rmin

g

1.ACCEP

T cu

ttin

gs,

expl

ants

IG

NO

RE

cells

unq

ualif

ied

3.ACCEP

T na

med

pla

nt g

row

th s

ubst

ance

(4)


80

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

4(b

)(i)

1.

Perc

enta

ge o

f se

edlin

gs (

show

ing

totip

oten

cy)

decr

ease

s as

age

incr

ease

s up

to

21 d

ays/

nega

tive

corr

elat

ion

up t

o 21

day

s/eq

2.

As

age

incr

ease

s {a

fter

21/

from

21-

28/a

t 28

} da

ys

perc

enta

ge o

f se

edlin

gs s

how

ing

totip

oten

cy

incr

ease

s/eq

3.

28 d

ays

is a

n an

omal

ous

resu

lt 4.

Cre

dit

corr

ect

man

ipul

atio

n of

the

dat

a

4. S

ome

exam

ples

are

sho

wn

belo

w

Day

s D

iffer

ence

(%

)

7-28

(7

6-60

) 1

6 7-

14

(76-

56)

20

7-21

–

Mp1

(76-

40)

36

14-2

1 (5

6-40

) 1

6 21

-28

– M

p2

(40-

60)

(+

) 20

IGN

ORE

calc

ulat

ed p

erce

ntag

e of

per

cent

age.

(2)


81

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

4(b

)(ii)

1.

{Rep

eats

/lar

ger

num

ber

of s

eedl

ings

} {a

t ea

ch

age/

in e

ach

grou

p}/e

q 2.

Mor

e ag

es o

f se

edlin

gs u

sed/

use

seed

lings

old

er

than

28

days

/tes

t 35

-day

-old

see

dlin

gs/e

q 3.

Rep

eat

28-d

ay g

roup

/rep

eat

any

anom

alou

s re

sults

/eq

1.ACCEP

T re

peat

ed t

he w

hole

exp

erim

ent

(2)

Qu

esti

on

Nu

mb

er

An

swer

M

ark

4(c

)(i)

As

phen

ol c

once

ntra

tion

incr

ease

s fr

om {

7 to

21/

7 to

14/

14 t

o 21

} da

ys,

perc

enta

ge o

f se

edlin

gs s

how

ing

totip

oten

cy d

ecre

ases

/neg

ativ

e co

rrel

atio

n up

to

21 d

ays/

eq

(1)

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

4(c

)(ii

) (A

s ph

enol

con

cent

ratio

n in

crea

ses)

at

28 d

ays

perc

enta

ge o

f se

edlin

gs s

how

ing

totip

oten

cy in

crea

ses

/eq

ACCEP

T re

fere

nce

to a

fter

21

days

.

(1)


82

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

4(d

)

1.

Totip

oten

t ce

lls c

an {

give

ris

e to

/diff

eren

tiate

to

beco

me}

{an

y ce

ll/ex

tra

embr

yoni

c tis

sues

/eq}

2.Pl

urip

oten

t ca

nnot

{gi

ve r

ise

to/d

iffer

entia

te t

o be

com

e} {

all c

ells

in t

he b

ody/

extr

a em

bryo

nic

tissu

es/e

q}

3.Id

ea t

hat

only

tot

ipot

ent

cells

can

giv

e rise

to

othe

r to

tipot

ent

cells

4.

Idea

tha

t to

tipot

ent

cells

can

giv

e rise

to

an e

ntire

hum

an b

eing

, pl

urip

oten

t ce

lls c

anno

t

NO

T tu

rns

into

, be

com

e, d

evel

op in

to b

ut p

enal

ise

once

onl

y.

1.ACCEP

T sp

ecia

lised

for

diff

eren

tiate

d 1

and

2 IG

NO

RE

refe

renc

e to

em

bryo

nic

cells

/tis

sues

, ACCEP

T pl

acen

tal c

ells

/tis

sues

. 2.

ACCEP

T ca

n gi

ve r

ise

to m

ost

cells

(2

)

Tota

l for

Qu

esti

on 4

= 1

2 M

arks


83

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

5(a

)(i)

1.

Incr

easi

ng m

ass

incr

ease

d th

e di

stan

ce u

p to

150

g 2.

150g

to

200g

/aft

er 1

50 (

g) t

he d

ista

nce

did

not

chan

ge

3.Rel

atio

nshi

p is

line

ar t

o 10

0(g)

and

non

-lin

ear

abov

e 10

0 (g

)

4.G

reat

est

chan

ge in

0 t

o 10

0 (g

) ra

nge

IGN

ORE

UN

ITS.

1.ACCEP

T w

eigh

ts in

stea

d of

mas

ses

(2

)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

5(a

)(ii

) 1.

Add

sm

alle

r m

asse

s/ad

d 10

g or

5g

mas

ses

2.Fr

om 2

00g

/ be

twee

n 20

0 an

d 25

0g

1.ACCEP

T m

asse

s of

any

val

ue le

ss t

han

50g,

e.g

. 20

g, m

ust

stat

e un

its

(2

)


84

To

tal

for

Qu

esti

on 5

= 9

Mar

ks

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

5(b

) 1.

Two d

iffer

ent

fibre

var

iabl

es t

aken

into

acc

ount

, e.

g. le

ngth

, w

idth

, ag

e, m

ass,

hyd

ratio

n le

vel,

part

of

pla

nt e

xtra

cted

fro

m

2.En

viro

nmen

tal v

aria

ble

cont

rolle

d, e

.g.

tem

pera

ture

, hu

mid

ity

3.

Nam

ed p

roce

dura

l var

iabl

e co

ntro

lled,

e.g

. si

ze o

f m

asse

s us

ed,

rett

ing

met

hod

used

to

extr

act

fibre

s 4.

Idea

of

addi

ng m

asse

s un

til fib

re b

reak

s/m

easu

re

the

mas

s th

at b

reak

s th

e fib

re/t

hat

the

fibre

can

ho

ld b

efor

e br

eaki

ng/e

q}

5.Rep

eat

and

find

the

{mea

n/av

erag

e}

6.Ref

eren

ce t

o ac

tion

take

n in

cas

e of

{an

omal

ous

resu

lt/ou

tlier

} 7.

Ref

eren

ce t

o sa

fety

pro

cedu

re

2.IG

NO

RE

light

inte

nsity

3.

ALL

OW

des

crip

tions

of

met

hodo

logy

, e.

g. t

he w

ay

in w

hich

the

mas

ses

are

adde

d to

the

fib

re

(5

)


85

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

6(a

)Any

2 c

orre

ct for

1 m

ark.

Feat

ure

C

ellu

lose

m

ole

cule

Cel

lulo

se

mic

rofi

bri

l Alp

ha (α)

gl

ucos

e ×

×

1,4-

gl

ycos

idic

bo

nds

9

9

1,6-

gl

ycos

idic

bo

nds

×

×

Hyd

roge

n bo

nds

×

9

No

mar

ks for

bla

nk s

pace

s.

No

mar

ks for

hyb

rid

x/9

.

(4)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

6(b

)

1.Arc

haea

2.Bac

teria

Eith

er w

ay a

roun

d.

1. A

CCEP

T Arc

haeo

bact

er

(2)


86

Tota

l for

Qu

esti

on 6

= 1

1 M

arks

Qu

esti

on

Nu

mb

erA

nsw

er

Mar

k

6(c

)1.

Idea

tha

t or

gani

sms

with

{sp

ecifi

c/pa

rtic

ular

/sha

red/

com

mon

/sim

ilar/

eq}

{cha

ract

eris

tics/

feat

ures

/tra

its e

g} a

re p

lace

d in

a g

roup

2.

Det

ail o

f ho

w c

hara

cter

istic

s as

sess

ed,

e.g.

obs

erva

ble

char

acte

rist

ics,

beh

avio

ural

sim

ilaritie

s,

sim

ilari

ties

in D

NA,

mol

ecul

ar p

hylo

geny

(2)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

6(d

) 1.

Sci

entif

ic fin

ding

s pu

blis

hed,

e.g

. in

a jou

rnal

2.

Idea

of

pres

ente

d at

sci

entif

ic c

onfe

renc

e/eq

3.

Idea

of

peer

rev

iew

4.

(Oth

er s

cien

tists

) re

peat

exp

erim

ents

(to

con

firm

or

val

idat

e fin

ding

s/te

st r

elia

bilit

y of

dat

a)

IGN

ORE

criti

cally

eva

luat

ed a

s it

is in

the

ste

m o

f th

e qu

estio

n.

3.Pe

er-r

evie

wed

jou

rnal

gai

ns M

p1 a

s w

ell

4.M

ust

be a

n in

dica

tion

of fur

ther

tes

ting

bein

g ca

rrie

d ou

t

(3)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

7(a

)X –

met

apha

se

Y –

anap

hase

Acc

ept

met

taph

ase,

met

apha

se.

Acc

ept

anna

phas

e, a

nnaf

ase.

(2

)


87

To

tal

for

Qu

esti

on 7

= 8

Mar

ks

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

7(b

) 1.

{chr

omat

in/D

NA}

cond

ense

s/eq

2.

Chr

omos

omes

{co

nden

se/b

ecom

e vi

sibl

e/eq

} 3.

Idea

of nu

clea

r {m

embr

ane/

enve

lope

} br

eaki

ng

dow

n 4.

Nuc

leol

us {

disa

ppea

rs/e

q}

5.Ref

eren

ce t

o ce

ntriol

es m

ovin

g to

pol

es o

r op

posi

te

ends

of ce

ll 6.

Ref

eren

ce t

o fo

rmat

ion

of s

pind

le (

fibre

s)

1.ACCEP

T co

iling

of D

NA,

not

supe

rcoi

ling

2.

ACCEP

T sh

orte

n or

thi

cken

5.

N.B

. pa

rt (

b) d

oes

not

spec

ify p

lant

cel

ls

(4)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

7(c

)1.

Inte

rpha

se

2.Chr

omos

omes

not

vis

ible

/nuc

leus

is v

isib

le/e

q

1.ACCEP

T/G

1/G

2/S

2.M

ust

be a

det

ail s

een

in t

he p

hoto

grap

h ACCEP

T co

nver

se,

e.g.

not

mito

sis

as

chro

mos

omes

not

vis

ible

(2)


88

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

*8

(a)

Qu

alit

y of

W

ritt

en

Co

mm

un

ica

tion

(Qua

lity

of W

ritt

en C

omm

unic

atio

n –

Spe

lling

of

tech

nica

l ter

ms

mus

t be

cor

rect

and

the

ans

wer

mus

t be

org

anis

ed in

a lo

gica

l seq

uenc

e.)

1.Id

ea t

hat

18 in

divi

dual

s is

a s

mal

l pop

ulat

ion/

smal

l ge

ne p

ool/

low

gen

etic

div

ersi

ty/m

ay h

ave

been

cl

osel

y re

late

d/eq

2.

Cap

tive

bree

ding

will

incr

ease

pop

ulat

ion

3.Stu

dboo

ks/r

ecor

ds k

ept

of b

reed

ing

prog

ram

me

/eq

4.(z

oos)

sel

ect

mat

es

5.In

ter-

zoo

exch

ange

of

anim

als

for

bree

ding

/eq

6.

Idea

of

the

need

to

prev

ent

inbr

eedi

ng

7.

Idea

of

avoi

ding

gen

etic

drift

8.

Use

of {I

VF/

AI/

use

of s

urro

gate

s}

9.Pr

oces

s fo

r m

easu

ring

gen

etic

div

ersi

ty

desc

ribe

d, e

.g.

DN

A p

rofil

ing/

eq

Qua

lity

of w

ritt

en c

omm

unic

atio

n em

phas

is is

cla

rity

of

exp

ress

ion.

ACCEP

T re

fere

nce

to ‘s

peci

es’ i

nste

ad o

f fe

rret

due

to

wor

ding

of

ques

tion.

4.M

ust

refe

r to

hum

an in

terv

entio

n –

not

just

the

fe

rret

s ch

oosi

ng t

heir

mat

es

6.N

OT

‘inte

rbre

edin

g’ in

pla

ce o

f ‘in

bree

ding

’ ACCEP

T ‘e

ncou

rage

out

bree

ding

’, e.

g. f

erre

ts n

ot

mat

ed w

ith c

lose

ly r

elat

ed fer

rets

(5)


89

Qu

esti

on

Nu

mb

erA

nsw

er

Mar

k

8(b

)(i)

1.

(Cap

tive)

pop

ulat

ion

not

larg

e en

ough

/num

ber

of b

irth

s is

low

/eq

2.In

divi

dual

s no

t m

atur

e en

ough

/eq

3.Zoo

s pr

epar

ing

ferr

ets

for

rele

ase/

eq

4.Id

ea o

f m

aint

aini

ng a

pop

ulat

ion

in z

oos

(2)

Qu

esti

on

Nu

mb

erA

nsw

er

Ad

dit

ion

al G

uid

ance

M

ark

8(b

)(ii

) 1.

Num

ber

of b

irth

s is

ris

ing/

eq

2.In

crea

se in

pop

ulat

ion

3.Id

ea t

hat

mor

e ar

e bo

rn t

han

are

rele

ased

, e.

g. a

t le

ast

200

birt

hs e

ach

year

4.

Iden

tific

atio

n of

yea

rs w

hen

num

ber

of b

irth

s fe

ll,

i.e.

1994

or

2000

5.

Cor

rect

man

ipul

atio

n of

dat

a

3.O

r so

me

unde

rsta

ndin

g th

at t

he in

crea

ses

outw

eigh

the

dec

reas

es,

e.g.

bet

wee

n 19

9–19

99 it

in

crea

sed

by 2

30,

but

only

fel

l by

170

to 2

000

from

199

9 5.

Som

e ex

ampl

es a

re s

how

n be

low

Ye

ar

Diff

eren

ce

%

1991

–200

0 M

p3

(220

-280

) 60

(+

) 27

/27.

3

1991

–199

9 (2

20-4

50)

230

(+)

105/

104.

5 19

99–2

000

(450

-280

) 17

0 (-

) 38

/37.

8

(2)


90

Centre Number Candidate Number

Write your name hereSurname Other names

Total Marks

Paper Reference

Turn over

S45356A©2013 Pearson Education Ltd.

1/

*S45356A0116*

BiologyAdvanced SubsidiaryUnit 3: Practical Biology and Research SkillsSample Assessment MaterialTime: 1 hour 30 minutes WBI03/01You must have:Ruler, Calculator, HB pencil

Instructions

Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name,

centre number and candidate number. Answer all questions. Answer the questions in the spaces provided

– there may be more space than you need.

Information The total mark for this paper is 40. The marks for each question are shown in brackets

– use this as a guide as to how much time to spend on each question.

Advice

Read each question carefully before you start to answer it. Keep an eye on the time. Try to answer every question. Check your answers if you have time at the end.

Pearson Edexcel InternationalAdvanced Level

To

tal f

or Q

ues

tion

8 =

12

Mar

ks

Tota

l fo

r P

aper

= 8

0 M

arks

Qu

esti

on

Nu

mb

er

An

swer

A

dd

itio

nal

Gu

idan

ce

Mar

k

8(c

)

1.Id

ea o

f ha

bita

t as

a f

acto

r, e

.g.

loss

of

habi

tat/

wid

er r

ange

of ha

bita

ts/e

q 2.

Ava

ilabi

lity

of {

prey

/foo

d/pr

airi

e do

gs/e

q}

3.Com

petit

ion

with

oth

er f

erre

ts (

for

reso

urce

s)

4.Com

petit

ion

with

oth

er s

peci

es (

for

reso

urce

s)/e

q 5.

Effe

ct o

f ea

ting

{poi

sone

d pr

airie

dogs

/poi

son

put

out

for

prai

rie

dogs

}/eq

6.

Pres

ence

of {p

reda

tors

/hun

ters

}/ e

q 7.

Prep

arat

ion

for

livin

g in

the

wild

impr

oves

cha

nce

of s

urvi

val/

if re

liant

on

hum

ans

wou

ld n

ot s

urvi

ve

8.Id

ea o

f to

o fe

w t

o be

a v

iabl

e br

eedi

ng p

opul

atio

n 9.

Idea

of

pres

ence

of di

seas

e

Fact

ors

may

eith

er im

prov

e or

red

uce

surv

ival

ch

ance

s.

1.Clim

ate

chan

ge c

an b

e ac

cept

ed h

ere

as a

fac

tor

affe

ctin

g av

aila

bilit

y of

sui

tabl

e ha

bita

t ACCEP

T de

scri

ptio

n of

hum

an a

ctiv

ity t

hat

coul

d le

ad t

o lo

ss o

r ga

in o

f ha

bita

t

3.In

tras

peci

fic c

ompe

titio

n

4.In

ters

peci

fic c

ompe

titio

n 7.

For

exam

ple,

kep

t in

sem

i-w

ild c

ondi

tions

initi

ally

an

d hu

ntin

g be

havi

our

enco

urag

ed

(3)

specimen (ial) ms - unit 2 edexcel biology.pdf

Documents