w
w
ap
eP
m
e
tr
.X
w
International General Certificate of Secondary Education
MARK SCHEME for the June 2005 question paper
0654 CO-ORDINATED SCIENCES
0654/02
Paper 2 Core (Theory), maximum raw mark 100
Mark schemes must be read in conjunction with the question papers and the Report on the
Examination.
•
CIE will not enter into discussion or correspondence in connection with these mark schemes.
CIE is publishing the mark schemes for the June 2005 question papers for most IGCSE and GCE
Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.
om
.c
s
er
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
Grade thresholds for Syllabus 0654 (Co-ordinated Sciences) in the June 2005 examination.
maximum
mark
available
Component 2
100
minimum mark required for grade:
AA
CC
EE
FF
N/A
50
32
24
The threshold (minimum mark) for DD is set halfway between those for Grades CC and EE.
The threshold (minimum mark) for GG is set as many marks below the FF threshold as the EE
threshold is above it.
June 2005
IGCSE
MARK SCHEME
MAXIMUM MARK: 100
SYLLABUS/COMPONENT: 0654/02
CO-ORDINATED SCIENCES
Paper 1 Core (Theory)
Page 1
1
(a)
Mark Scheme
IGCSE – June 2005
(i)
(ii)
(iii)
(b)
(i)
(ii)
(iii)
2
(a)
(i)
(ii)
(b)
3
(a)
water;
two electrodes dipping into electrolyte;
electrodes connected across voltmeter;
reacts with water/it will dissolve/is very reactive;
[1]
[1]
[1]
[2]
[1]
as force increases length of wool fibre increases;
proportionally/owtte;
breaks/will not return to normal length/loses elasticity/
past elastic limit
[2]
[1]
[max 2]
[2]
(i)
(ii)
scaly;
no covering/smooth/moisture;
[2]
(i)
B no mark
mass/weight ratio = 10/owtte;
A and D;
C no mark
has least mass;
[1]
[1]
[1]
particles;
vibrate;
[2]
time = distance/speed;
= 400 000/300 000 = 1.33 seconds;
[2]
(a)
violet and green;
[1]
(b)
would not contain manganese oxide;
would not contain iron oxide;
reference to avoiding transition metal compounds/
transition metal compounds impart the colour;
[3]
B;
reference to giant structure or description/B shows a compound;
reference to random arrangement of atoms;
[3]
(c)
4
[1]
genes;
environment;
or
two environmental factors e.g.
temperature/climate;
food/diet;
(ii)
(iii)
(b)
Paper
2
hydrogen;
R (most)
Q
S (least);
increase in temperature of reactants/tube feels warm/owtte;
traps air;
acts as insulator;
less convection/less heat loss by radiation;
(c)
(d)
Syllabus
0654
(c)
© University of Cambridge International Examinations 2005
Page 2
(d)
5
Mark Scheme
IGCSE – June 2005
(i)
(ii)
(a)
(b)
(c)
(d)
(a)
oxygen;
sulphur dioxide is formed;
sulphur dioxide harmful to humans;
amount of sulphur dioxide must be kept as low as
possible;
A stamen/anther;
B ovary/ovule;
C petal;
insects attracted by petals/scent;
visits flower to obtain nectar;
picks up pollen;
from anthers;
deposits it on stigma;
(i)
(ii)
(i)
(ii)
6
plant/flower → bee →bee eater
organisms in correct order;
arrows drawn pointing the right way;
bees and bee eaters;
[max: 2]
[3]
[1]
[max: 2]
[2]
[1]
using wind
no pollution/
saves fossil fuels/
renewable
need lots of
turbines/
damages
landscapes/
noisy/
no use without wind
using nuclear
no air pollution/
one nuclear
power station
provides lots of
energy
waste needs safe
disposal/
radioactive waste
harms people/
waste needs safe
disposal
;;;; [4]
[1]
(ii)
fossil fuels are running out/causing pollution;
(i)
(ii)
transformers;
to reduce heat/energy losses;
[1]
[1]
protein to chicken and fat to butter;
protein to making new cells and fat to providing
new energy;
[2]
(a)
(b)
[1]
(i)
disadvantage
7
Paper
2
[max: 3]
photosynthesis;
absorbs sunlight;
which is used to make carbon dioxide and water react;
energy transferred to
sugar/glucose/starch/carbohydrates;
advantage
(b)
Syllabus
0654
(i)
(ii)
liver;
by kidneys;
detail of how they work e.g. filtration from blood;
(excreted in) urine;
© University of Cambridge International Examinations 2005
[1]
[2]
Page 3
8
Mark Scheme
IGCSE – June 2005
light can pass through/you can see through
[1]
(b)
contain the same elements/covalent;
different numbers of atoms one more atom of oxygen in
the peroxide/peroxide molecule larger/heavier;
[2]
(i)
(ii)
(d)
[2]
add detergent to water;
use a non-aqueous solvent;
[2]
[1]
[1]
(i)
(ii)
not a complete circuit/no connection between cell and lamp;
ampere;
(b)
(i)
ammeter in series;
voltmeter in parallel;
rest of circuit correct;
R = V/I;
evidence of working;
= 1 ohm;
0.4 x 0.4 = 0.16;
0.16;
(iii)
(iv)
(a)
(b)
(c)
(d)
11
glowing splint;
relights;
1.0g/the same;
catalyst is not used up/owtte;
(a)
(ii)
10
Paper
2
(a)
(c)
9
Syllabus
0654
(a)
(b)
(c)
(i)
(ii)
(iii)
(iv)
[2]
[3]
[3]
[1]
[1]
cannot be created nor destroyed;
always converted into another form;
[2]
energy initially used to make the particles move faster;
at boiling point energy used to separate particles/overcome
forces of attraction
[2]
water is a good conductor of electricity;
danger of electric shock/electrocution;
[2]
smaller volume;
means more collisions with walls of container;
more collisions with wall means more pressure;
[2]
electrolyte;
anode;
[2]
solution becomes alkaline;
sodium hydroxide produced;
[2]
five;
five;
seven;
neutron;
[1]
[1]
[1]
[1]
© University of Cambridge International Examinations 2005
Page 4
12
(a)
(b)
Mark Scheme
IGCSE – June 2005
(i)
(ii)
(iii)
(i)
(ii)
Syllabus
0654
protects the brain;
cartilage softer;
any named synovial joint e.g. elbow, knee;
reduced friction/provides smooth surface;
or
in nose/ear;
support with flexibility;
chewing/grinding;
increase surface area of food;
food more likely to stay on them;
because they have uneven surface;
bacteria feed on the food/bacteria produce acids;
© University of Cambridge International Examinations 2005
Paper
2
[1]
[1]
[2]
[2]
[max: 2]