0610 w13 ms_33

CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certificate of Secondary Education
MARK SCHEME for the October/November 2013 series
0610 BIOLOGY
0610/33 Paper 33 (Extended 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 2013 series for most IGCSE,
GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level
components.

Mark Scheme Syllabus Paper
IGCSE – October/November 2013 0610 33
© Cambridge International Examinations 2013
Question Expected Answers Marks Additional Guidance
1 (a) arthropods/Arthropoda ; [1] R ‘anthropod’
(b) A – spiny/oval, carapace/AW ;
jagged edge of carapace ;
claws same length ;
eyes on (short) stalks ;
B – long/coiled/soft , abdomen ;
abdomen not under carapace ;
(long) antennae ;
multiple, appendages/mouth parts ;
shorter back (walking) legs ;
uneven length of, chelipeds/claws/pincer ;
hair on claws ;
eyes on stalks ;
C – uneven length of, chelipeds/claws/pincers ;
square/rectangular, carapace ;
eyes on (long) stalks ;
D – rounded/flattened/less hairy, back/hind
(walking) legs ;
longer/wider back (walking) legs (compared to
other legs) ;
jagged edge on claws ;
jagged/pointed edge, of carapace ;
short antennae ;
no eye stalks ;
claws same length ; [4]
A descriptions of carapace/back/‘shell’
ignore exoskeleton for carapace
ignore ‘tail’ for abdomen
ignore segmented abdomen
ignore clamp
ignore fur for hair
A larger/bigger as BOD (for hind legs)

1 (c) (i) mass ;
size of a named suitable feature ;
length of named suitable feature ;
width of named suitable feature;
number of hairs ;
number of spikes/roughness ;
thickness of a suitable named feature ;
hardness of a suitable named feature ;
depth of colour ; [max 1]
features qualified in (c)(ii) may be credited in (c)(i)
R number of anything absolute (e.g. legs)
R shape unqualified
R colour unqualified
R fur
ignore comparing species rather than individuals
(ii) balance/weighing machine/scales ;
use of ruler described ;
calipers ;
any other suitable method for the feature given in (i) ; [max 1]
ignore measure unqualified
No ECF from (c)(i)
1 (d) 1
2
3
4, 5
6
7
population remains the same if birth rate = death rate/ref to
carrying capacity ;
death rate must be high ;
many young crabs do not survive to, adulthood/breed ;
example of cause of high death rate ;;
lack of/competition for, food ;
ref to limiting factor(s) ;
[max 3]
examples of MP4 and MP5
eaten by predators
competition with other crabs (of the same species/other
species)
competition with other non-crab species
(infectious) disease
effect of abiotic factor (e.g. dehydration)
indirect effect of man, e.g. pollution/habitat destruction
genetic disease/genetic ‘fault’
fishing/crabbing

(e) 1
2
3
4
5
6
7
stops/reduces, blood loss/bleeding ;
reduce (bacterial) infection/bacteria killed in wound ;
(clotting) prevents entry of pathogens ;
more red blood cells, trapped in mesh/fibrin (forming a
clot/scab) ;
promotes healing ;
(in an emergency) may need wound to be sealed quickly ;
less chance of allergies ; [max 3]
ignore bandages help quicker clotting
R viral infections
[Total: 13]

2 (a) (i) amino acids ;
[1]
A (di/oligo/poly)peptide
(ii) (permanent) increase in, size/length/AW ;
increase in dry mass ;
increase in cell number ;
[max 2]
Note: increase in dry mass = 2 marks
A ref to cell division/mitosis/reproduction of cells
R reproduction unqualified
ignore development
(b) 1
2
3
4
5
6
7
8
identify/locate, the (position of) gene (in bovine genome) ;
cutting, chromosome/DNA/plasmid ;
insert gene into a, plasmid/vector ;
plasmid/vector, enters the bacterium ;
reproduction/growth, of (GM) bacteria (in fermenters) ;
bacteria, synthesise/produce, the protein/BST ;
protein/BST, harvested/purified ;
correct reference to (named) enzyme ; [max 3]
answers referring to insulin can be credited with marking
points 2,3,4,5,8
e.g. restriction enzyme/ligase/endonuclease

(c) (i)
1
2
3
4
5
6
7
8
9
mean milk yield to max 4
immediate increase (from treatment/week 10) ;
peaks/increases and decreases ;
(general) decrease after 20 weeks/43.3 – 43.7kg per day ;
(mean) BST/A, yield always higher than, B/no BST (from 10
week/treatment) ;
any suitable data quote giving mean milk yield with units and
week ;
mean food energy intake to max 4
peaks/increase and decreases ;
(then) levels off ;
(mean) BST/A, energy always higher than, B/no BST (from 10
week/treatment) ;
any suitable data quote giving mean food energy intake with units
and week ;
[max 6]
Note: All units (kg per day) must be stated for mean milk
yield but ignored for food energy intake
A optimum/maximum for peak
MP 5
39 kg per day at, 10 weeks/start of treatment
43.3–43.7kg per day at either 19/20 weeks or 9/10 weeks,
after treatment
29kg per day at either 36–37 weeks or 26 - 27 weeks, after
treatment
approx 10kg per day difference between A and B
MP 9
158MJ per day at, 10 weeks/start of treatment
164MJ per day from either week 29 – 34 or after 19–24
weeks of treatment
165MJ per day at either week 36–37 or 26–27 weeks, after
treatment
172MJ per day at 19.5–20 weeks

2 (c) (ii) 1
2
3
4
5
6
7
milk yield does not increase much (from initial yield) ;
increase only for, 10 weeks/short period ;
increase in food (energy) intake ;
cattle feed adds extra costs ;
idea of milk yield decreases but food (energy) intake remains
high (from 20 week) ;
use of comparative data in support ;
cost of, using/producing, BST ;
[max 3]
MP 6
after, 30 weeks/20 weeks treatment, differences in milk yield
10±2kg (per day), differences in food energy 26–52MJ (per day)
milk yield shows a 20± 2% increase, food intake shows a 15 –
32 % increase after, 30 weeks/20 weeks treatment
(d) 1
2
3
4
5
labelling, provides information/allows consumer choice ;
concerns about hormones ‘in the milk’ ;
possible effects on human health ;
e.g. allergies/side effects
ref to, animal welfare/health of cattle expected to produce more
milk ;
there is no reason to label the milk/described example ;
[max 3]
ignore unethical unqualified
examples for MP5
confusion in consumer minds about GM food
loss in sales
there is no difference in the milk
this is not a GM food, but GM technology is used in the
production of BST
ignore ‘milk is safe’
[Total: 18]

3 (a) E – cortex ;
F – medulla ;
G – ureter ; [3]
(b) (i)
process letter reason
diffusion of
oxygen
H ; idea that (oxygen) diffuses, from
high concentration/to low
concentration/down concentration
gradient (into the cell) ;
active uptake
of sodium ions
L ; idea that (sodium ions) are moved
against their concentration
gradient/from low to high
concentration ; [4]
mark the columns independently
(ii) glomerulus ; [1]
(iii) 1
2
3
4
(glucose is reabsorbed) by active uptake/active transport (from
filtrate) ;
against concentration gradient/from low to high concentration ;
using energy ;
as in L ; [max 2]
ignore diffusion of glucose
R energy ‘produced’
(c) 1
2
3
4
5
6
active uptake/active transport, of ions against the concentration gradient
(into the root) ;
energy is needed for, active uptake/active transport ;
comes from respiration ;
water is absorbed, by osmosis/down water potential gradient ;
(osmosis/diffusion is a) passive process/does not need energy ;
diffusion of ions will occur until equilibrium ; [max 3]
R energy ‘produced’
[Total: 13]

4 (a)
cell end products of respiration
aerobic anaerobic
yeast carbon
dioxide/CO2
+
water/H2O ;
carbon dioxide/CO2 +
alcohol/ethanol/C2H5OH ;
human
muscle
cell
carbon
dioxide/CO2
+
water/H2O ;
lactic acid lactate/
C3H6O3/CH3CH(OH)COOH
/
CH3CH(OH)COO-
;
[4]
ignore ATP/energy
4 (b) 1
2
3
4
5
6
7
8
9
10
11
12
13
muscles contract ;
need more energy ;
increase in need for oxygen ; ORA
removal of (more) carbon dioxide ;
(increase in) aerobic respiration ;
anaerobic respiration also occurs ;
developing oxygen debt,/oxygen not supplied fast
enough ;
(production of) lactate/lactic acid ;
increase in stroke volume (of heart) ;
increase in, blood flow/glucose/oxygen, to muscles ;
blood pressure increase because heart rate/stroke
volume increases ;
removal of heat ;
ref to adrenaline ;
[max 5]
ignore ‘breathing rate’, ‘ventilation rate’, ’oxygen
absorption’, ‘heart rate’, ‘blood pressure’ (all are in the
Table)
R repaying oxygen debt (occurs after exercise)
[Total: 9]

5 (a) transfer, of (named) pathogen/disease, from (infected) to (uninfected)
person/animal/organism ;
a (named) medication/substance, taken into the body that,
modifies/affects/influences, (chemical reactions in) the body ; [2]
A (harmful) microorganism/bacteria/virus/fungus for
pathogen
A infected by/passed down for ‘transfer’
R named non-human organisms
(b) 1
2
3
4
5
6
7
8
9
10
11
(named) pathogens of water/(formula) milk ;
(named) water-borne diseases ;
(new born) babies have, weak/no, immune systems ; AW
few(er) antibodies from mother (as no breast milk) ;
ref to HIV infects lymphocytes/white blood cells/weakens
immune system ;
no/few, lymphocytes/white blood cells ;
few/no, antibodies produced ;
then phagocytes are less effective ;
stomachs do not produce much acid ;
diarrhoea/vomiting ;
dehydration/loss of, water/ions ; [max 4]
for MP1
A contamination of, water/bottle
A (harmful) microorganism/bacteria/virus/fungus for
pathogen
ignore germs
for MP3 ignore children

(c) 1
2
3
4
5
6
7
8
9
10
11
12
bonding with mother ;
it’s free/‘cheap’ ;
sterile/no risk of infection from, formula milk/bottled milk ;
is at, body/correct, temperature ;
no preparation/easily available ;
provides, best/complete/most suitable/AW, food ;
easier to digest ;
contains antibodies/ref to colostrum/provides passive immunity ;
provides protection against, pathogens/diseases/microorganisms ;
reduce risk of allergies ;
contraceptive effect ;
AVP ;
[max 4]
examples of AVPs for MP12
no additives
further antibody detail, e.g. diseases that the
mother has had/common diseases ;
composition/quantity, of breast milk changes to
match development of baby ;
protects against, breast cancer/ovarian cancer ;
helps the body to return to ‘normal’ e.g. weight
loss/restores uterus ;

5 (d) 1
2
3
(unprotected/AW) sexual intercourse/from semen/vaginal fluids ;
sharing, needles/syringes ;
blood/blood product, for transfusion/transplants/blood to blood
contact ; ignore blood unqualified
[max 2]
A ‘sex’
R saliva/tears/sweat/urine
R donating blood
R skin contact
R kissing
R (genetically) inherited
ignore other sharps, e.g. tattoo needles/razors unless
qualified by blood contact
ignore unqualified body fluids/breast milk/placenta
[Total: 12]

6 (a) 1
2
3
4
5
6
7
provide, mineral (elements)/(named) ions/(plant)
nutrients ;
that are in low concentration in soils ;
(minerals/ions are) limiting factor(s) ;
for, growth/yield ;
magnesium (ions) for chlorophyll production ;
for photosynthesis ;
nitrogen/nitrate (ions), for making, amino acids/
proteins ; [max 3]
MP2 A any reason, e.g. removed in crops at
harvest/leached/AW
MP5 R chloroplast
(b) oxygen ;
water/moisture ;
suitable/ warm temperature ;
AVP ;
[max 3]
ignore humidity unqualified
R ‘hot’, ‘heat’
examples of AVPs
any condition that breaks dormancy, e.g. light/optimum pH
(c) 1
2
3
4
5
6
sulfuric acid has a bigger effect on roots than shoots ;
0.003mol per dm-3
sulfuric acid has biggest effect ;
increase in root growth until 0.003mol dm-3
sulfuric acid ; ORA
negligible difference in effect (on root/ shoot) between 0.001
and 0.002mol dm-3
sulfuric acid ;
comparative data quote for root growth ;
comparative data quote for shoot growth ;
[max 4]
for MP5 and MP6 see the table of results (results from two
rows are required in each case)
units must be stated once
(d) 1
2
increase in burning, fossil fuels/named fossil fuel ;
cars/factories/power stations/AW ;
[2]
more is not needed for MP2 as question says 150 years

(e)
1
2
3
4
5
6
7
8
9
10
11
12
13
effects of sulfur dioxide on organisms and their environment
plants/leaves/roots/trees/bark, damaged/killed/
stunted growth ;
plants more likely to get diseased ;
inhibits germination ;
(sensitive species of ) lichens killed ;
microorganisms killed ;
soil/lake/river, pH decreases ; AW
aluminium ions become mobile ;
nutrients/named example(s), leached ;
shells damaged ;
animals fail to reproduce ;
low pH/aluminium ions, toxic to fish ;
fish produce mucus which blocks gills ;
AVP ;
[max 3]
ignore sea
ignore marine (fish)
examples of AVPs for MP13
chemical weathering/dissolve carbonate rocks
respiratory problems in, human/animals
(described) consequence for food chains
[Total: 15]

Table of results for Question 6 (c)
Roots
concentration of
acid/mol dm-3
length/mm time/days
0 25 24
0 55 72
0.001 23 24
0.001 65 72
0.002 20 24
0.002 65 72
0.003 8 24
0.003 15 72
Shoots
concentration of
acid/mol dm-3
length/mm time/days
0 13 24
0 22 72
0.001 11 24
0.001 20 72
0.002 11 24
0.002 20 72
0.003 6 24
0.003 10 72

0610 w13 ms_33

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0610 w13 ms_33