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 allocations are shown in brackets. • You will be assessed on your ability to use an appropriate form and style of writing, to organise relevant information clearly and coherently, and to use specialist vocabulary, where appropriate. • The degree of legibility of your handwriting and the level of accuracy of your spelling, punctuation and grammar will also be taken into account.

3 4 5 6 7 8

Total (Column 1) Total (Column 2) TOTAL

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Examiner’s Initials

APW/0204/BYA5

BYA5

2 Answer all questions in the spaces provided.

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1

The drawings show three cells. Two of the cells are from multicellular organisms and one is a single-celled organism. The three organisms belong to different kingdoms.

30 µm

60 µm

1 µm

Cell A

Cell B

Cell C

Name the kingdom to which each organism belongs. In each case, give one feature of the cell, visible in the drawing, which is characteristic of the kingdom and which helps to distinguish it from cells of organisms belonging to the other two kingdoms.

Cell A

Kingdom ................................................................................................................................ Feature ................................................................................................................................... .................................................................................................................................................

Cell B

Kingdom ................................................................................................................................ Feature ................................................................................................................................... .................................................................................................................................................

Cell C

Kingdom ................................................................................................................................ Feature ................................................................................................................................... ................................................................................................................................................. (6 marks) 6

APW/0204/BYA5

3

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2

Division of the nucleus by meiosis produces haploid cells from a diploid cell. Nuclei produced by mitosis have the same number of chromosomes as the parent nucleus.

(a)

What is the biological importance of reducing the chromosome number when the cell divides by meiosis? ....................................................................................................................................................... ....................................................................................................................................................... ..........................................................................................................................................................
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