| Date | May 2013 | Marks available | 2 | Reference code | 13M.3.SL.TZ1.14 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Label | Question number | 14 | Adapted from | N/A |
Question
Label the following diagram of the eye.
[2]
a.
Outline the diversity of stimuli that can be detected by human chemoreceptors.
[2]
c.
Markscheme
I iris
II vitreous humour
III choroid
IV fovea (do not accept yellow spot)
Award [1] for every two correct answers.
a.
a. (dissolved) chemicals detected by taste buds (in the tongue and mouth);
b. (airborne) chemicals detected by (olfactory) receptors;
c. chemicals/ions/pH in blood (for example CO2/glucose) detected by chemoreceptors (in carotid artery/medulla oblongata);
d. neuroreceptors detect neurotransmitters;
c.
Examiners report
(a) was well done with most candidates being able to identify the structures of the eye appropriately.
a.
(c) was also well answered.
c.
Syllabus sections
Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics) » A.3 Perception of stimuli
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