HBS 2011 marking key.pdf - HBS3 2011 marking key (student...

HBS3 2011 marking key (student version)
Section One: Multiple-choice questions
1 A 6 C 11 B 16 A
2 C 7 A 12 A 17 D
3 D 8 B 13 B 18 C
4 B 9 B 14 A 19 B
5 C 10 D 15 C 20 D
Text in grey ( like this ) are for MCQ that are out of syllabus or without a picture.
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Section Two: Short-answer questions
Question 21 (8 marks)
(a) Complete the table below, describing key differences between how the nervous and endocrine systems control
homeostasis in the body. (4 marks)
Question 22 (12 marks)
NOT IN SYLLABUS
Question 23 (11 marks)
NOT IN SYLLABUS
Question 24 (15 marks)
(a) Suggest a hypothesis for this experiment. (1 mark)
(b) Describe two (2) variables that were controlled in the experiment. (2 marks) (c) What is the purpose of a placebo? (1 mark)
(d) Graph the results in the table on the grid provided below. You may use pencil. (5 marks)
(e)(i) At which time of the day was the new drug most effective? (1 mark)
(e)(ii)
At which time of the day was the new drug least effective? (1 mark)

4 am