9700_w02_qp_2

9700_w02_qp_2 - Centre Number Candidate Number Candidate...

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This question paper consists of 11 printed pages and 1 blank page. SP (SM/JB) S26225/3 © CIE 2002 [Turn over CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level BIOLOGY 9700/2 PAPER 2 OCTOBER/NOVEMBER SESSION 2002 1 hour Candidates answer on the question paper. No additional materials are required. TIME 1 hour INSTRUCTIONS TO CANDIDATES Write your name, Centre number and candidate number in the spaces at the top of this page. Answer all questions. Write your answers in the spaces on the question paper. All working for numerical answers must be shown. INFORMATION FOR CANDIDATES The intended number of marks is given in brackets [ ] at the end of each question or part question. Candidate Centre Number Number Candidate Name FOR EXAMINER’S USE 3 2 1 4 TOTAL 6 5
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2 9700/2/O/N/02 Answer all the questions. Write your answers in the spaces provided. 1 Fig. 1.1 is a drawing made from an electron micrograph showing a cross-section of an alveolus and two adjacent capillaries. Fig. 1.1 (a) Calculate the magnification of Fig. 1.1. Show your working and express your answer to the nearest whole number. .......................................................................................................................................... ...................................................................................................................................... [2] (b) With reference to Fig. 1.1, describe the process of gaseous exchange in the alveolus. .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... ...................................................................................................................................... [4] 10 m fibre-secreting cell alveolar air space For Examiner’s Use
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3 9700/2/O/N/02 [Turn over Allergies, such as asthma, are the result of an over reaction by the immune system to a harmless antigen. When people suffer from an asthma attack, their immune systems
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9700_w02_qp_2 - Centre Number Candidate Number Candidate...

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