Mal. ALOE fam BOTSWANA EXAMINATIONS COUNCIL in collaboration with UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE Botswana General Certificate of Secondary Education CANDIDATE NAME, CENTRE ] | CANDIDATE NUMBER, il | NUMBER BIOLOGY _ 0572/03 Paper 3 Suly / August 20@¢ ‘1 hour 15 minutes Additional Materials: Answer paper READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name in the spaces provided at the top of this page. DO NOT WRITE IN ANY BARCODES. Section A ‘Answer all questions. ‘Write your answers in the spaces provided on the question paper. Section B Answer both questions. Write your answers on the separate answer paper provided. Write your Centre number, candidate number and name on each sheet of answer paper you use. ‘At the end of the examination fasten all sheets of answer paper to this question paper using the string provided, You may use a calculator. Do not use steples, paper clips, highlighters, glue or correction fluid, ‘The number of marks is given in brackets [ } at the end of each question or part question. You are advised to spend no longer than 40 minutes on Section A. For Examiner's Use Section A Section B 6 TOTAL This document consists of 6 printed pages and 2 blank pages. DO [SJFSI10/CGW) 114885 © BEC 2000 [Turn over2 Section A Answer all questions in this section in the spaces provided. 1 Fig. 1.1 shows a type of circulatory system known as a single circulatory system. Arrows represent the direction of blood flow. respiratory organ een rest of the body Fig. 1.1 (@) Identity the type of blood vessels X and Y. oe (b) Indicate with letter P on the diagram where blood gains oxygen. 1] () Suggest and explain one problem that might be encountered if Man had a single circulatory system. (a) Fig. 1.2 shows a unicellular organism found in fresh water. magnification X700 Fig. 1.2 Explain why the organism in Fig. 1.2 is able to survive without @ blood circulatory system. (Total: 7] @ BEC 2009 os7e0wonves | - 13) | pw Exarino’t Use2 3 Malasia is an insect borne disease caused by a protozoon. (@) State one symptom of malaria. (b)_ State two characteristics of protozoa. 2] (c) Describe the role of mosquitoes in the transmission of malaria. - 5) (d) What measures can be taken against an adult mosquito in order to control malaria? - [2] [Total: 10] © BEC 2009 osranaronuos [Turn overi! lester 3 Fig. 3.1 shows four seedlings W, X, Y and Z that have been set up to investigate their | response to unidirectional light. | tip cut aluminium | off foil | | i OG) w x Y z Fig. 3.1 (@) Describe briefly a set up that could be used to ensure that seedlings receive light from one direction. M1 Y (b) Predict the appearance of the shoots after several days in unidirectional light. (c) Which part of the seedling is sensitive to light? (4) (i) What name is given to the growth response to light? Gi) Explain how this growth response is caused. [4] (otal: 11) | © BEC 2009 os72ewonog: ie 4 Table 4.1 shows the number of different groups of people who died from bronchitis. Table 4.1 group of people | _ no. of deaths per 100 non smoker ie light smoker 20 heavy smoker 42 (a) @ What general pattern can be drawn from the table? (ii) What effect does smoking have on the bronchioles? Be) | (iil) Smokers usually suffer from shortness of breath. ‘Suggest how this is brought about. . (5) (b) Describe how cigarette smoking causes emphysema. | (4) [Total: 12] © BEC 2009 osranaoivos [Turn overWrite your answers on the separate answer paper provided, 6 Section B Answer both questions. 5 (a) Name the two sections of the small intestine and describe the functions of each part. [10] (b) Describe the roles of the pancreas and the liver in the regulation of blood sugar. 6 (a) Explain why a kidney is considered to be an excretory organ. (®) With reference to the kidneys describe the (©) Describe and explain how urine composition changes during a sunny day. © BEC 2009 () filtration of the blood (i) re-absorption. os720wonven 5) Total: 15] 2} {10} (3) Total: 15]