9700_w01_er - BIOLOGY GCE Advanced Subsidiary Level Paper...

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BIOLOGY GCE Advanced Subsidiary Level Paper 8700/01 Multiple Choice Question Number Key Question Number Key 1 A 21 D 2 B 22 C 3 A 23 D 4 A 24 B 5 C 25 A 6 B 26 A 7 C 27 B 8 D 28 B 9 B 29 C 10 A 30 B 11 D 31 C 12 B 32 D 13 B 33 C 14 D 34 C 15 B 35 C 16 C 36 B 17 D 37 C 18 A 38 A 19 A 39 D 20 C 40 A General comments There was a very good spread of scores around the mean of 22 (55%), the standard deviation being 6.54. No question was found to be particularly easy but only three questions, Questions 29 , 31 and 38 , were difficult, being answered correctly by fewer than 40% of candidates. Several questions were poor discriminators in that a smaller proportion than expected of the more able candidates were able to answer correctly. These questions were Questions 5 , 26 , 27 , 28 , 29 , 31 , 32 , and 38 . These poor discriminators were balanced by other questions giving very good discrimination, where the poorer candidates could do little better than make a guess. Good discriminators tend to be items testing problem-solving skills, for instance Questions 18 and 25 and items testing knowledge of biochemistry, for instance Questions 7 , 8 , 9 , 14 and 19 . Comments on specific questions Question 5 The better candidates did not appear to be well informed about the role of cholesterol in cell surface membranes. Question 14 This was a fairly difficult item with very good discrimination. Nearly three quarters of the better candidates knew the answer, while nearly half of the poorer candidates favoured option C .
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Question 23 94% of the most able candidates knew the answer, while options B , C and D were almost equally popular amongst the least able, making this item another good discriminator. Question 26 This item was more difficult than anticipated, with an almost equal number of candidates choosing option B as choosing the correct option, A . Question 28 The apparatus shows that the person is inhaling expired air and the change on the trace shows that breathing rate is increasing. It was expected that candidates should know that this change is due to a rise in the carbon dioxide concentration of the inhaled air (from sections 1(a) and 1(d) of the syllabus), yet a large proportion of the better candidates thought that it was due to a fall in oxygen concentration. Question 29 The total volume of blood returning to the heart is 5.6 litres (option D ) but the question asks for the volume of blood returning through only one of the two pulmonary veins. The low discrimination of this item was perhaps due to the better candidates being less observant than the weaker ones. Question 31 This, admittedly, rather obscure effect of caffeine on the body was not known by even the better candidates. Question 35
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This note was uploaded on 01/25/2012 for the course BIO alevels taught by Professor J.b during the Spring '11 term at Taylor's.

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9700_w01_er - BIOLOGY GCE Advanced Subsidiary Level Paper...

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