Mark scheme

Biology unit B1

Additional science

January 2009

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  • Created on: 15-06-10 09:53
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MS2
£2.00
GENERAL CERTIFICATE OF SECONDARY EDUCATION
TYSTYSGRIF GYFFREDINOL ADDYSG UWCHRADD
MARKING SCHEME
BIOLOGY
SCIENCE UNIT B1
ADDITIONAL SCIENCE UNIT B2
JANUARY 2009

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INTRODUCTION
The marking schemes which follow were those used by WJEC for the January 2009
examination in GCSE Biology Units B1 & B2. They were finalised after detailed discussion
at examiners' conferences by all the examiners involved in the assessment. The
conferences were held shortly after the papers were taken so that reference could be made
to the full range of candidates' responses, with photocopied scripts forming the basis of
discussion.…read more

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B1 JANUARY 2009
FOUNDATION TIER
1. (a) greenfly, [1]
(b) (i) compete for food; [1]
(ii) eat them [1]
(not: ref. to size/eat all their food))
(c) all plots correct, +/- 0.5 small square, no extrapolation, -1 per error [2]
plots joined through centre of plots with a ruler [1]
(d) extinct [1]
Question total [7]
2.…read more

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FOUNDATION AND HIGHER TIER
7/1 (a) (i) Genus / are the same genus / Both have the genus name Mustela [1]
(ii) Because the scientific name is the same in all countries / universal /
[1]
the common name differs in different countries
(not: global language)
(b) (i) Because the stoat also hunts in farmland / ORA [1]
Because the stoat can also hunt in the day / ORA [1]
(ii) Because the weasel is small enough to hunt burrowing mammals /
ORA [1]
(not:…read more

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Ref. to any two of: [2]
the survey being carried out at the same time every year
the exact same 10m/certain part of stream surveyed
water conditions must be (as far as possible) the same e.g. temp (1), flow
rate (1)
some sampling techniques must be used/same time
same equipment used ­ specified e.g.…read more

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HIGHER TIER
3. (a) (i) HH and hh both required [1]
(not: if other letters used; allow consequential error)
(ii) 1 mark for all 4 gametes correct. 1 mark for mechanics of cross [2]
Independent marks
Gametes H H
h Hh Hh
h Hh Hh
(not: single in a(i) and double in table or if a(i) blank)
(iii) 1 mark for all 4 gametes correct.…read more

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As the temperature rises) sweat production increases [1]
urine production decrease [1]
or ref to numbers
(b) Explanation (As temperature rises) the sweat glands make more sweat [1]
to cool the body [1]
(c) (i) hairs lie flat
vasodilation occurs/capillaries increase in diameter
(not: get bigger/expand/move up/ref. to shivering) [2]
(ii) Converse of c(i)
(allow ref. to shivering) [2]
7.…read more

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ADDITIONAL SCIENCE
B2 JANUARY 2008
FOUNDATION TIER
1. (a) 60% (18 million tonnes) [1]
(b) less (air) pollution / less energy needed / less trees cut down or used [2]
(c) non biodegradable / do not rot / decompose [1]
(not: ref. to time if short term/hard to decompose/ref. to animals)
Question total [4]
2.…read more

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Clockwise ­ burning, respiration, feeding, photosynthesis [4 × 1]
(b) bacteria / fungi / decomposers [1]
(not: microbes/worms)
(c) deforestation / increase burning fossil fuels / increase in traffic /
increase in power stations [1]
(not: cutting down trees)
(d) (i) killing fish / trees/ tops of pine trees turn yellow [1]
(ii) lung disease [1]
Question total [8]
7…read more

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FOUNDATION AND HIGHER TIER
6/1. (a) any two of the following: eaten/killed by rat / stoat
Its food is eaten by possum / deer / rabbit [2 × 1]
(not: competition unqual.)
(b) biological [1]
(not: bio control/biological pesticides)
(c) easier to remove all the predators / no predators/not as many rats [1]
easier to remove the animals that were competing for food / no competitors [1]
(not: ref. to humans/less food unqual.…read more

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