| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.SL.TZ1.9 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 9 | Adapted from | N/A |
Question
Which movement occurs by osmosis?
A. Oxygen from alveoli into the blood
B. Water from a leaf into the atmosphere
C. Water from soil to root
D. Nitrate ions from soil to root
Markscheme
C
Examiners report
There similar complaints from a few teachers about Question 9. At Standard Level students are not expected to have studied transpiration, but the examining team felt that the answer referring to water moving from a leaf into the atmosphere could have been eliminated without knowing details of transpiration because movement of water molecules from a liquid state inside the leaf to the gases of the air outside cannot be osmosis.
