May 2003 Paper 3 Markscheme

May 2003 Paper 3 Markscheme, International Baccalaureate, IB Bio SL Past Papers

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M03/410/S(3)M+
>
INTERNATIONAL
BACCALAUREATE
BACCALAURÉAT
INTERNATIONAL
BACHILLERATO
INTERNACIONAL
MARKSCHEME
May 2003
BIOLOGY
Standard Level
Paper 3
13 pages
 – 2 –
M03/410/S(3)M+
This markscheme is
confidential
and is the property of the
International Baccalaureate and must
not
be reproduced or
distributed to any other person without the authorization of
IBCA.
– 3 –
M03/410/S(3)M+
General Marking Instructions
Subject Details:
Biology SL Paper 3 Markscheme
Mark Allocation
Candidates are required to answer
ALL
questions in each of
TWO
Options (total
[17 marks]
).
Maximum total =
[36 marks]
.
General
A markscheme often has more specific points worthy of a mark than the total allows. This is intentional.
Do not award more than the maximum marks allowed for part of a question.
When deciding upon alternative answers by candidates to those given in the markscheme, consider the
following points:
w
Each marking point has a separate line and the end is signified by means of a semicolon (;).
w
An alternative answer or wording is indicated in the markscheme by a “/”; either wording can be
accepted.
w
Words in ( … ) in the markscheme are not necessary to gain the mark.
w
The order of points does not have to be as written (unless stated otherwise).
w
If the candidate’s answer has the same “meaning” or can be clearly interpreted as being the same
as that in the mark scheme then award the mark.
w
Mark positively. Give candidates credit for what they have achieved, and for what they have got
correct, rather than penalising them for what they have not achieved or what they have got
wrong.
w
Occasionally, a part of a question may require a calculation whose answer is required for
subsequent parts. If an error is made in the first part then it should be penalized. However, if the
incorrect answer is used correctly in subsequent parts then
follow through
marks should be
awarded. Indicate this with
“ECF
”, error carried forward.
w
Units should always be given where appropriate. Omission of units should only be penalized
once. Indicate this by
“U-1”
at the first point it occurs. Ignore this, if marks for units are already
specified in the markscheme.
w
Do not penalize candidates for errors in significant figures, unless it is specifically referred to in
the markscheme.
– 4 –
M03/410/S(3)M+
Option A – Diet and Human Nutrition
A1.
(a)
(i)
parsley;
[1]
(ii)
egg;
[1]
If the answers to A1 (a) (i) and (ii) are correct, but inverted, i.e. (i) egg and (ii)
parsley, award
[0]
, but apply Error Carried Forward (ECF) to marking points (b)
and (c). Write ECF beside the answer and use the alternative marking points given
below.
(b)
plant products more effective overall / animal products least effective;
the three / four / five most effective foods are all plant products / ratios given of 3 plants;
but soy-beans is an exception / similar to egg;
potato and skimmed milk are similar in effectiveness;
With ECF:
plant products least effective overall / animal products more effective;
the three / four / five least effective foods are all plant products / ratios given of 3 plants;
but soy-beans is an exception / similar to egg;
potato and skimmed milk are similar in effectiveness;
[3 max]
(c)
give supplements of parsley / garlic / onion to a group of people;
use women after the menopause / with osteoporosis;
use women with ovaries removed;
have another control group of similar people who are not given the supplement;
measure changes in bone density during the trial period / measure calcium loss;
With ECF:
g
ive supplements of egg / meat / soy-bean to a group of people;
use women after the menopause / with osteoporosis;
use women with ovaries removed;
have another control group of similar people who are not given the supplement;
measure changes in bone density during the trial period / measure calcium loss;
[3 max]
A2.
(a)
(i)
lipids / fats / amino acids / proteins / fatty acids / alcohol;
[1]
(ii)
energy storage;
synthesis of glycoproteins;
synthesis of nucleic acids;
synthesis of some amino acids;
synthesis of lipids / fats;
component of cell membrane;
dietary fibre / roughage;
[2 max]
(b)
(i)
two of
honey / fruit / another named fruit / candy / biscuits / cakes / other;
[1]
(ii)
two of
bread / liver / potato / rice / pasta / other;
[1]
– 5 –
M03/410/S(3)M+
A3.
(a)
atherosclerosis / atheroma / fatty deposits in artery walls / causes blocked arteries /
blood clots;
coronary heart disease / heart attacks / heart problem;
high blood pressure;
obesity;
[2 max]
(b)
hens reared for egg laying are often kept in small cages / unsuitable conditions;
male chicks / non-productive females cannot lay eggs so are killed;
long periods of egg laying may cause stress to hens;
laying infertile eggs is not natural behaviour for hens;
hens produce food for humans without having to be killed;
occasionally eggs are fertile so an embryo is killed;
chickens force fed hormones / steroids;
[3 max]
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