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MS4
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GCSE MARKING SCHEME



SCIENCE - BIOLOGY

SUMMER 2009

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INTRODUCTION

The marking schemes which follow were those used by WJEC for the Summer 2009
examination in GCSE SCIENCE - BIOLOGY. 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…

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B1

FOUNDATION TIER

1 Predation

(a) Fox and rabbit [1]

(b) (i) 1.5 (months) (allow: 1.2 to 1.8) [1]

(ii) (large) increase/growth in numbers (not: more rabbits) [1]

Fewer foxes so less predation from/fewer foxes to kill/eat rabbits [1]
(not: no foxes/ no hunting or catching)

(c) Shortage of food/space/disease/loss…

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4 Health

(a) (i) Fat (not: high fat diet) [1]

(ii) Eat less high energy foods/do not eat excess food energy [1]
(not: eat more low energy foods/ don't eat too much/eat less fat or
calories)
Eat less salt/do not add (excess) salt to food [1]
(not: eat no salt)…

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B1
FOUNDATION AND HIGHER TIER
6/1 (a) Ref to ownership of DNA/worries about insurance
companies/employers having access/invasion of privacy/infringement
of human rights [1]
(not: ref to fear of being convicted of an offence/arrested later/stealing
records)
(b) Allows police to identify people/suspects (on the database) who have
committed a crime/identify dead…

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8/3 (a) In the blood (stream)/blood plasma [1]
(not: in red blood cells/blood vessels/plasma)

(b) Pancreas [1]
(not: Islets of Langerhans)

(c) Liver [1]


(d) Changes the sugar/glucose to glycogen (correct spelling) [1]
(not: breaks down)

(e) Low carbohydrate/low fat/ low sugar diet
(not: low salt and sugar/correct amount of…

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B1

HIGHER TIER

4 (a) Sweat gland [1]


(b) It will contract/shorten (not: pull/expand/constrict) [1]


(c) more blood flows in the skin
capillaries get wider/dilate
therefore more heat lost/radiated
[2/3] [2]
(not: bigger / nearer the surface/vasodilate)
[4 marks]


5 (a) (i) Spray/treat (the plant) with herbicide and it survives…

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7 (a) (i) y axis: risk of developing heart disease in 6 years (%)
x axis: blood cholesterol mg per cm3 [1]

(ii) y axis: 0 ­ 10
x axis: 200 ­ 280 [1]

(iii) both correct [1]


(b) The higher/greater the cholesterol level the greater the risk [1]

The…

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B2

FOUNDATION TIER

1 (a) (i) A nucleus [1]

B cell membrane [1]

C cytoplasm [1]

(ii) F, D, E (any two) [2]


(b) Grow [1]

Replaced [1]

Damaged [1]

[8 marks]



2 (a) (i) Two from: leaves, grass, twigs [1]

(ii) Compost [1]

(iii) Improve soil (not: fertiliser) [1]…

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4 (a) 4 correct plots, -1 per error, +/- half small square [2]

Line, drawn with ruler through centre of plots, no extrapolation. [1]
Bar graph, allow 1 mark only if all plots correct.

(b) (i) Correct from candidate's graph (approx. 20) [1]

(ii) Rise/increase, then [1]
fall/decrease [1]
If…

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