| Date | November 2016 | Marks available | 1 | Reference code | 16N.3.SL.TZ0.3 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Identify | Question number | 3 | Adapted from | N/A |
Question
The micrograph shows a section of an organ in the human body.
State from which organ the section was taken.
Identify the layer of tissue found at X.
The actual length of the structure labelled Y is 0.8 mm between the two black lines. Calculate the magnification of the micrograph. Working should be shown.
The actual length of the structure labelled Y is 0.8 mm between the two black lines. Calculate the magnification of the micrograph. Working should be shown.
Markscheme
small intestine
Do not accept villi/villus or intestine alone.
epithelium
Do not accept microvilli/brush border.
a. calculation shown with accurate measurement of length of villus
OR
For the first marking point to be awarded, the measurement must be between 53 and 55 mm.
b. 67 or 68 or 68
Allow any value between 67 and 69 inclusive.
Accept decimals e.g. 68.75.
Allow ECF from first marking point.
a. calculation shown with accurate measurement of length of villus
OR
\(\frac{{53}}{{0.8}}\) or \(\frac{{54}}{{0.8}}\) or \(\frac{{55}}{{0.8}}\) «mm»
For the first marking point to be awarded, the measurement must be between 53 and 55 mm.
b. 67 or 68 or 68
Allow any value between 67 and 69 inclusive.
Accept decimals e.g. 68.75.
Allow ECF from first marking point.
