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Surname Centre Number Candidate Signature Other Names Candidate Number Leave blank 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 > Examiner’s Initials APW/0204/BYA5 BYA5 2 Answer all questions in the spaces provided. LEAVE MARGIN BLANK 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 LEAVE MARGIN BLANK 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? ……………………………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………. (2 marks) (b) The table gives one difference between meiosis and mitosis. Complete the table by giving three further differences. 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 4 LEAVE MARGIN BLANK 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.

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