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Cambridge International Examinations IGCSE Biology Paper 6 Mark Scheme - May/June 2014, Exams of Computer science

Data AnalysisBiochemistryCell BiologyExperimental Techniques

The mark scheme for cambridge international examinations international general certificate of secondary education (igcse) biology paper 6 (alternative to practical) for the may/june 2014 series. It provides guidance on how marks should be awarded for each question, including the criteria for accurate answers, use of appropriate terminology, and adherence to the experimental procedure. The mark scheme covers various topics such as enzymes, ph, and the breakdown of fat, and it includes assessment of students' understanding of experimental techniques and data analysis.

What you will learn

  • What are the key points to consider when assessing answers for Question 1(b)(iii) and (iv)?
  • What are the assessment criteria for Question 2(d)(ii) and (iv)?
  • What are the criteria for awarding marks in Question 1(a) of the IGCSE Biology Paper 6?

Typology: Exams

2013/2014

Uploaded on 12/02/2021

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CAMBRIDGE INTERNATIONAL EXAMINATIONS

International General Certificate of Secondary Education

MARK SCHEME for the May/June 2014 series

0610 BIOLOGY

0610/63 Paper 6 (Alternative to Practical), maximum raw mark 40

This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of

the examination. It shows the basis on which Examiners were instructed to award marks. It does not

indicate the details of the discussions that took place at an Examiners’ meeting before marking began,

which would have considered the acceptability of alternative answers.

Mark schemes should be read in conjunction with the question paper and the Principal Examiner

Report for Teachers.

Cambridge will not enter into discussions about these mark schemes.

Cambridge is publishing the mark schemes for the May/June 2014 series for most IGCSE, GCE

Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components.

Page 2

Mark Scheme

Syllabus

Paper

IGCSE – May/June 2014

© Cambridge International Examinations 2014

Mark Scheme

Mark

Guidance

(a)

candidates

have

filled

in

temperatures

(lowest

to

highest) ;times are transferred in correct sequence 0–20 ;colour of indicator recorded correctly from Fig.1.1 in all columns ;

[3]

(b)

(i)

lipase works best in alkaline conditions / provides suitable pH forlipase ;

[1]

(ii)

idea that both tubes reach the experimental temperature ;

[1]

(iii)

fatty acids produced by the breakdown of fat ;(acids) lower pH (causing colour to change) ;

[2]

(iv)

stays blue

no colour change ;

enzyme doesn’t react

denatured

AW ;

[2]

(v)

anomalous 21

°C, for 10 min ;

reason: idea that the colour changes are not in theexpected order ;

[2]

(c)

×

2 of:

V:

enzyme concentration ;

C:

same source

concentration of enzyme

lipase used in all

tubes ;

V:

substrate concentration ;

C:

same source of milk

same type of milk

or named type ;

V:

indicator ;

C:

same concentration

volume added

comparison of colour with

chart or meter;

V:

timing length of reaction;

C:

minute intervals precisely using timing device;

[4]

Page 4

Mark Scheme

Syllabus

Paper

IGCSE – May/June 2014

© Cambridge International Examinations 2014

(c)

(i)

A

(xes) – labelled with units and suitable even scale ;

S

(ize) – occupies at least half the grid ;

P

(lot) – all points plotted accurately

½ square ;

B

(ars) – have an equal gap between each component ;

[4]

(ii)

22.25 + 0.25 + 2.00 + 2.50 = 27 ;100 – 27 (ecf) = 73 (ecf) ;

[2]

(d)

(i)

day 5 ;maximum reducing sugar content ;OR day 4;skin has gone completely yellow;

[2]

(ii)

×

6 times ;

[2]

(iii)

the starch has been broken down to (reducing) sugar ;

[1]

(iv)

2 features from: colour

taste

smell ;;

max [1]

[Total: 23]