| Date | May 2017 | Marks available | 2 | Reference code | 17M.3.SL.TZ2.4 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 2 |
| Command term | Label | Question number | 4 | Adapted from | N/A |
Question
The images show the early stages and completed outcome of the process of neurulation.
Label the parts I and II on the images.
[2]
a.
Structure Y will eventually elongate to form two structures. State the names of these two structures.
1.
2.
[2]
b.
State the condition that arises if the closure of structure X is incomplete during embryonic development.
[1]
c.
Markscheme
I: neural groove/plate/fold
II: ectoderm
a.
brain
spinal cord
b.
spina bifida
c.
Examiners report
[N/A]
a.
[N/A]
b.
[N/A]
c.
Syllabus sections
Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics) » A.1 Neural development
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