Paper Past

Wednesday 11 January 2012 – Morning

AS GCE BIOLOGY

F211 Cells, Exchange and Transport

* F 2 1 0 0 1 0 1 1 1 *

Candidates answer on the Question Paper. OCR supplied materials: • Insert (inserted) Other materials required: • Electronic calculator • Ruler (cm/mm)

* F 2 1 1 *

Duration: 1 hour

INSTRUCTIONS TO CANDIDATES • • • • • • The Insert will be found in the centre of this document. Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters. Use black ink. HB pencil may be used for graphs and diagrams only. Answer all the questions. Read each question carefully. Make sure you know what you have to do before starting your answer. Write your answer to each question in the space provided. If additional space is required, you should use the lined pages at the end of this booklet. The question number(s) must be clearly shown. Do not write in the bar codes.

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INFORMATION FOR CANDIDATES • • • • • • The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 60. Where you see this icon you will be awarded marks for the quality of written communication in your answer. You may use an electronic calculator. You are advised to show all the steps in any calculations. This document consists of 16 pages. Any blank pages are indicated.

OCR is an exempt Charity

© OCR 2012 [K/500/8550] DC (CW/SW) 44655/1

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2 Answer all the questions. 1 Fig. 1.1 shows an air sac and a capillary in the mammalian lung. air movement during ventilation

epithelium of air sac air in air sac

deoxygenated blood flow oxygenated blood flow

capillary

Fig. 1.1 (a) The mammalian lungs contain many air sacs. (i) Name the air sacs and state why there are many air sacs in the lungs. ..............................................................................................................................................