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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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Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics)
Option A: Neurobiology and behaviour

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