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CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certificate of Secondary Education

MARK SCHEME for the October/November 2012 series

0653 COMBINED SCIENCE
0653/21

Paper 2 (Core Theory), maximum raw mark 80

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 October/November 2012 series for most IGCSE,
GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components. Page 2
1

Mark Scheme
IGCSE – October/November 2012

(a) statement given a particle with an negative electrical charge measures electrical current unit of potential difference does not conduct electricity

Syllabus
0653
word required electron ; ammeter ; volt ; insulator ;

(b) (i) goes out ; incomplete circuit / circuit is broken ;
(ii) so that they can be individually turned on and off ; so that they all get the full mains voltage ; so that if one fails the rest still operate ;
(iii) R = R1 + R2 ;
= 2.4 Ω ;

Paper
21

[4]

[2]

[max 2]

[2]
[Total: 10]

2

(a) (i) A ;

[1]

(ii) B, E, F ;

[1]

(iii) starch / cellulose / sugar / any other correct ;

[1]

(iv) 0.04%;

[1]

(allow 0.03%)

(b) (i) remove undigested substances ; from the, alimentary canal / digestive system / anus or as faeces ;
(ii) consumer and herbivore ;
(iii) to prevent extinction (of earthworms) ; reference effect on, food chains / ecosystem ; because they improve the soil by aeration ; because they improve the soil by releasing plant nutrients ; other valid point ;

[2]
[1]

[max 2]
[Total: 9]

3

(a) (i) 7 ;
>7 to 14 ;

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