| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.HL.TZ1.21 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Identify | Question number | 21 | Adapted from | N/A |
Question
What is a feature of alveoli?
A. They occur in all animals because they are needed for gas exchange.
B. They have a higher oxygen concentration than air in the atmosphere to increase the rate of diffusion.
C. They have walls that are one cell thick for faster diffusion.
D. They are small so keep the gases inside them more concentrated.
Markscheme
C
Examiners report
N/A
Syllabus sections
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