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MS2
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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…

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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]…

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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…

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(b) 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…

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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…

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6. (a) (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…

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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…

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5. (a) (i) 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…

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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…

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