IGCSE Double Award Science (Biology)
4437/1F
Mark Scheme (Results)
November 2008
IGCSE
IGCSE Double Award Science - Biology (4437/1F)
Edexcel Limited. Registered in England and Wales No. 4496750
Registered Office: One90 High Holborn, London WC1V 7BH
The following acronyms are used
owtte
or words to that effect
ecf
error carried forward
dop
dependent on previous
nwn
no working necessary
4437_1F
0811
Question
Number
1
(a)
(b)
(c)
(d)
(e)
(f)
(g)
Correct Answer
B
B
A
B
D
A
D
Notes
Mark
1
1
1
1
1
1
1
(7)
(Total 7 marks)
4437_1F
0811
Question
Number
2 (a) (i)
Question
Number
2 (a) (ii)
Correct Answer
Notes
oxygen;
carbon dioxide;
water vapour;
nitrogen / other correctly named gas;
Correct Answer
Mark
Max
(2)
Notes
Mark
bronchus;
alveolus;
(2)
Question
Number
2 (b) (i)
Question
Number
2 (b) (ii)
Correct Answer
Notes
peristalsis;
muscles;
contract / squeeze / eq;
Correct Answer
Mark
Max
(2)
Notes
Mark
stomach;
(1)
(Total 7 marks)
4437_1F
0811
Question
Number
3
Correct Answer
Function of organ
Removes carbon dioxide from the body
Stores urine
Removes urea from blood
Releases sweat from the body
Notes
Name of organ
lung;
bladder;
kidney;
skin;
Mark
(4)
(Total 4 marks)
4437_1F
0811
Question
Number
4 (a)
Correct Answer
Notes
Mark
line showing positive correlation;
(1)
Question
Number
4 (b) (i)
Correct Answer
Notes
Mark
as pH increases, number of birds increases /
eq;
(1)
Question
Number
4 (b) (ii)
Correct Answer
Notes
Mark
low ph decreases insects/food; less birds;
OR
high ph increases insects/food; more birds;
(2)
Question
Number
4 (c)
Correct Answer
sulphur dioxide / nitrous oxide / carbon
dioxide;
Notes
Mark
(1)
(Total 5 marks)
4437_1F
0811
Question
Number
5
Correct Answer
Notes
Mark
fungi; Accept decomposers ONCE
bacteria;
increases / eq;
oxygen;
gasp / die / eq;
(5)
(Total 5 marks)
4437_1F
0811
Question
Number
6 (a)
Question
Number
6 (b) (i)
Question
Number
6 (b) (ii)
Correct Answer
Body part harmed by
cancer
Pancreas
Mouth
Stomach
Lung
Testis
Notes
Mark
Section
(B)
A;
B;
B;
D;
Correct Answer
(4)
Notes
all correct = 2 / two or one correct = 1;;
Correct Answer
Mark
(2)
Notes
Mark
group 1 / non smoker who does not work
with asbestos;
(1)
Question
Number
6 (b) (iii)
Correct Answer
Notes
Mark
increases risk;
5times;
(2)
Question
Number
6 (b) (iv)
Correct Answer
Notes
Mark
smoker versus non smoker has increased risk;
(1)
(Total 10 marks)
4437_1F
0811
Question
Number
7 (a)
Correct Answer
Notes
Mark
amylase / carbohydrase;
amino acids / polypeptides / peptides;
lipase;
(3)
Question
Number
7 (b)
Correct Answer
Notes
Mark
digestion / breakdown / decay / eq;
nitrate / phosphate / other named mineral
ion;
carbon dioxide;
respiration;
photosynthesis;
(5)
(Total 8 marks)
4437_1F
0811
Question
Number
8 (a) (i)
Correct Answer
Notes
Mark
plasma;
(1)
Question
Number
8 (a) (ii)
Question
Number
8 (b) (i)
Correct Answer
Notes
transport cells / salts / vitamins / hormones
/ carbon dioxide / urea / digested food /
maintain blood volume / pressure / eq;
Correct Answer
Mark
Max
(1)
Notes
Mark
white blood cells / leucocytes / phagocytes
/ lymphocytes;
(1)
Question
Number
8 (b) (ii)
Question
Number
8 (c)
Correct Answer
Notes
engulf / eq;
produce antibodies;
destroy/kill/digest pathogens/bacteria / eq;
Correct Answer
Mark
Max
(2)
Notes
Mark
red cells / erythrocytes;
(1)
Question
Number
8 (d)
Correct Answer
Notes
Mark
lack of oxygen;
lack of glucose;
respiration;
to brain / heart / other named organ / cells;
low blood pressure;
Ignore lungs/body
Max
(2)
(Total 8 marks)
4437_1F
0811
Question
Number
9 (a) (i)
Correct Answer
Notes
Mark
aphids in middle;
arrows correct;
(2)
Question
Number
9 (a) (ii)
Question
Number
9 (a) (iii)
Correct Answer
Notes
reduce (yield) /less tomatoes;
eat/feed on leaves/plants / sugars;
less photosynthesis;
Correct Answer
Mark
Max
(2)
Notes
Mark
biological control;
(1)
Question
Number
9 (b)
Correct Answer
affects other species / not specific;
affects humans/ poisonous to humans /
affects taste;
bioaccumulation;
food chain disruption;
pollution;
needs reapplication;
resistance; Ignore immune
Notes
Mark
Max
(3)
(Total 8 marks)
4437_1F
0811
Question
Number
10
Correct Answer
Notes
Mark
enucleated egg cell / egg nucleus removed /
empty egg cell;
nucleus;
from skin / from father’s cell;
electric treatment / stimulation of cell
division;
in vitro/eq;
mitosis;
embryo;
uterus / womb;
surrogate (mother);
(5)
(Total 5 marks)
4437_1F
0811
Question
Number
11 (a)
Correct Answer
Notes
Mark
two / both / same;
h / hh / not dominant / not showing;
(2)
Question
Number
11 (b)
Correct Answer
hh
h
Hh
Huntington
and
and
and
and
Notes
Mark
Hh;
H and h;
hh;
normal;
(4)
Question
Number
11 (c)
Correct Answer
neurones / nerve cells / sensory;
electrical / impulses;
synapses;
Notes
Mark
Max
(2)
(Total 8 marks)
4437_1F
0811