| Date | May 2017 | Marks available | 1 | Reference code | 17M.2.SL.TZ2.2 |
| Level | Standard level | Paper | Paper 2 | Time zone | Time zone 2 |
| Command term | State | Question number | 2 | Adapted from | N/A |
Question
The electron micrograph shows the structures in an exocrine gland cell of the pancreas.
Glands are organs that secrete and release particular chemical substances. Melatonin is an important hormone secreted in the pineal gland in the brain. Describe its role in mammals.
[2]
a.
State the principal product of this cell.
[1]
b.i.
Using the table, identify the organelles labelled I and II on the electron micrograph with their principal role.
[2]
b.ii.
Markscheme
a. controls circadian rhythms/biological clocks «in mammals»
b. production is controlled by amount of light detected by the retina
c. high production/secretion in the dark
OR
no production/secretion in the day
OR
production/secretion is directly proportional to night time duration
d. affects «seasonal» reproduction/sleep-wake cycles/jet lag
a.
«digestive» enzymes
b.i.
b.ii.
Examiners report
[N/A]
a.
[N/A]
b.i.
[N/A]
b.ii.
Syllabus sections
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