cape bio mark scheme

8/18/2019 CAPE Bio Mark Scheme

1/4

Mark Scheme

CAPE Biology2014-2015

Westwood ighSchool

!o"ic# E$%yme Co$ce$tratio$

Skills Assessed# &''

Marks

Allotte

d

Mark

s

Proper Format

i. Aim, apparatus/materialii. Correct sequence of headings

iii. Correct content under each heading

2

1

1

Appropriate language

(past tense, reported speech, no

grammatical/spelling errors)

2

Diagram of Apparatus (suitale title, laelled,

neat)

!

"ethod# susection $here appropriate, past tense 2

%ale

i. Completel& orderedii. %itle, full capitalised

iii. 'ecord time to 1 decimal place

1

1

1

raph#

i. Appropriate title, full& capitalised

. *cale + correct units, occupies at least half

of grid

i. Aes laelled $ith quantit& and units

ii. raph accuratel& dra$n, line of est -t

1

1

2

2

!otal Marks 20

!o"ic# Water Pote$tial

Skills Assessed# &''

Marks

Allotte

d

Mark

s

Proper Format

i. Aim, apparatus/material. Correct sequence of headings

i. Correct content under each heading

2

1

1

Appropriate language

(past tense, reported speech, no

grammatical/spelling errors)

2

Diagram of Apparatus (suitale title, laelled,

neat)

!

"ethod# susection $here appropriate, past tense 2

%ale of 'esults

i. Completel& ordered. %itle, full capitalised

i. 'ecord alues to 1 decimal places

11

1

raph#

iii. Appropriate title, full& capitalised

i. *cale + correct units, occupies at least half

of grid

. Aes laelled $ith quantit& and units

i. raph accuratel& dra$n, line of est -t,

interpolation sho$nCalculations of percent change

1

1

2

2

2

!otal Marks 22


2/4

!o"ic# Se"aratio$ o( )*A

Skills Assessed# A+

Marks

Allotte

d

Mark

s

ac0ground nformation ( terms releant to

eperiment clearl& eplained)

i. *tructure of DA

ii. Properties of DA

iii. Descrie ho$ DA is pac0aged in

eu0ar&otic cells

,5

1

2

2

3planation of 'esultsi. Purpose/role of each reagent

ii. Account for DA precipitation in cold

alcohol

iii. 4ould the results e an& di5erent if

another plant species $as used6 4h&6

i. Discuss at least 2 reasons iotechnologists

$h& separate DA

,!

1

2

1

7imitations 1

Co$cl.sio$ /li$k isolatio$ tech$i.e to

iochemical "ro"erties o( )*A speci-c,

2

!o"ic# E$%yme !em"erat.re

Skills Assessed# A+

Marks

Allotte

d

Mark

s

ac0ground nformation ( terms releant to

eperiment clearl& eplained)

i. Properties of en8&mes

. nduced -t model of en8&me mechanism

i. 'ole of catalase in the od&

ii. 9ther factors that a5ect en8&me actiit&

,5

1

1

1

23planation of 'esults

. 3plain trend of graph, deduce optimum

temperature

i. dentif& controlled/manipulatedo:; ariale

ii. Account for outlier alues (decline $as not

uniform)

iii. Account for the general change in the rate

of decomposition (molecular changes)

,

2

2

1

2

7imitations 1!o"ic# )rawi$g o( &$io$ E"idermal

Cell

Skills Assessed# )rawi$g

Marks

Allotte

d

Mar

ks

%itle + suitale, capital onl&, 1Clarit neatness, sharp single lines,

su


3/4

!o"ic# )rawi$g o( Lilium o3.le

Skills Assessed# )rawi$g

Marks

Allotte

d

Mar

ks

%itle + suitale, capital onl&, and elo$

dra$ing

1

Clarit neatness, sharp single lines,

su


4/4

!o"ic# Microsco"y

Skills Assessed# MM

Marks

Allotte

d

Mar

ks

Preparation of 4et "ount#

• Drop in centre of slide

• Place coer slip starting at a =>o

• o air ules

• Place slide at centre of stage

• ?se stage 0nos to manoeure

stage

• efore focusing at 1;, locate

specimen at scanning =

!

7o$er stage efore s$itching to a

higher o@ectie

2

Focussing at 1;# use course

ad@ustment to produce a sharp image

2

Focussing at =;# use -ne ad@ustment 2

!o"ic# Water Pote$tial i$ Potato

Skills Assessed# MM

Marks

Allotte

d

Mar

ks

Cutting strips (use 0nife, ruler and

forceps)

• All peel remoed

• All strips of equal cuic

dimensions

• *traight edges on strip ends

2

"easuring out 1;cm of aCl solution• Calculate mass of aCl needed to

ma0e up solutions• Accuratel& $eigh aCl to nearest

1 d.p.• 'ead ottom of meniscus at e&e

leel

• nterpreting accurac& of scale of

c&linder

2

mmerse strips in test tues

• ?se forceps and not -ngers

(handling of apparatus B

material)

• *trips completel& immersed

•

All ! strips put in at same time perconcentration

• 1 minute staggering of times per

concentrations

2

'emoe strips after 2> minutes

• 'emoe ! strips from each conc.

at the same time

• ?se forceps to remoe

2

• Dr& strips and measure

dimensions• "easure $ith ruler accuratel&

2

Collectie e5ort ($or0ing in groups)#• Diide up and designate tas0s

$ithin the group

• Performed at least 1 tas0 $ith the

group not onl& $riting

2

!otal# 12

cape bio mark scheme

Documents