Unit 5 Paper June 2004.Pdf

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General Certificate of Education June 2004 Advanced Level Examination

BIOLOGY/HUMAN BIOLOGY (SPECIFICATION A) Unit 5 Inheritance, Evolution and Ecosystems
Tuesday 22 June 2004 Morning Session
No additional materials are required. You may use a calculator.

BYA5

For Examiner’s Use Number 1 2 Mark Number Mark

Time allowed: 1 hour 30 minutes
Instructions • Use blue or black ink or ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions in the spaces provided. All working must be shown. • Do all rough work in this book. Cross through any work you do not want marked. Information • The maximum mark for this paper is 75. • Mark
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Meiosis

Mitosis

1

Reduces the chromosome number

Maintains the same chromosome number as in the parent nucleus

2

3

4

(3 marks) 5

Turn over
APW/0204/BYA5

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3

Phytoplankton are microscopic photosynthesising organisms which live in water. In favourable environmental conditions they have a very high rate of reproduction. They are eaten by microscopic animals called zooplankton. In an investigation, samples of water were removed from a lake at intervals over a twelve-month period and the biomasses of these organisms were determined. The results are shown in the graph.

Phytoplankton

Biomass

Zooplankton

Jan

Feb Mar Apr May Jun

Jul

Aug Sep

Oct Nov Dec

Month The diagram shows the relationship between the biomass of the phytoplankton and the biomass of the zooplankton for one of the months during this investigation.

Zooplankton Phytoplankton

(a)

Use the graph to give one month in which this relationship would have been found. ....................................................................................................................................................... (1 mark)

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(b)

Explain why the biomass of the primary consumers is less than the biomass of the producers in most communities. .......................................................................................................................................................

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