| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.HL.TZ2.23 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Identify | Question number | 23 | Adapted from | N/A |
Question
Which of the following are controlled by homeostasis?
I. Blood pH
II. Water balance
III. Blood glucose concentration
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Markscheme
D
Examiners report
Some teachers pointed out that blood pH and other variables are not controlled by homeostasis; their control is a part of homeostasis. This distinction did not seem to worry the candidates, with 70% getting the answer right and the discrimination index indicating that these were largely the stronger candidates.
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