2016 HKDSE Biology Paper 2 - 2016-DSE 810 PAPER 2 HONG KONG...

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2016-DSE 810 PAPER 2 HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION 2016 INSTRUCTIONS BIOLOGY PAPER 2 11 .4 5 am -12 .4 5 pm (1 hour) This paper must be answered in English (1) There are FOUR sections , A , 8 , C and 0 in this Pape r. Attempt ALL questions in any TWO sections. (2) Write your answers in the Answer Book DSE (C) provided. Start each question (not pa of a question) on a new page (3) Present your answers in paragraphs wherever appropriate. (4) IIIustrate your answers with diagrams wherever appropriate. (5) The diagrams in this paper are NOT necessarily drawn to scale. 。香港考試及評核局 保留版權 Not to be taken away before the end of the examination session Hong Kong Examinations and Assessment Authority AII Rights Reserved 2016 2016-DSE-BIO 2 l
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SECTION A Human Physiology: Regulation and Control Answer ALL parts of the question. l(a) The table below shows how the relative percentages of energy contribution om anaerobic and aerobic respiration change with different durations of vigorous exercise: Duration of Relativ~ _p ~centag ofene y~ontrib _l.!_ t iQ_ n vlgorous exerclse Anaerobic respiration Aerobic respiration 10 seconds 95 5 30 seconds 85 15 1 minute 70 30 2 minutes 50 50 8 minutes 30 70 12 minutes 15 85 30 minutes 5 95 (i) What is the relationship between the duration ofvigorous exercise and the energy contribution from the two respiratory pathways? (l mark) (ii) For vigorous exercise of short duration (10-30 seconds) , energy mainly comes from the breakdown of the food store in muscles. (l) Use a f1 0wchart to show the two major steps in converting this food store to a usable form of energy through the anaerobic pathway. (2 marks) (Note: Details ofthe intermediates in the p hwayare not required.) (2) Even though energy mainly comes from the anaerobic pathway , athletes who have just performed vigorous exercise for short duration still need to breathe fast for a while. Explain the importance of this phenomenon. (2 marks) (iii) During exercise , our sympathetic nervous system is stimulated. Explain how this will bring about physiological changes to sustain the exercise. (4 marks) 2016-DSE-BIO 2-2 2
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The graph below shows the renal glucose handling capability (reabsorption and excretion) in a healthy person and in a patient suffering from non-insulin-dependent (type Il) diabetes: 1. ,/ ku reabsorption (diabetic patient) f ' , ' , reabsorption (healthy person) .. excretion (healthy person) . . . /f. .Je X C O dia b e 前圳 t ...
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