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Question 19M.3.HL.TZ1.5b

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.HL.TZ1.5b
Level HL Paper 3 Time zone TZ1
Command term State Question number b Adapted from N/A
b.
[Maximum mark: 1]
19M.3.HL.TZ1.5b

The diagram shows part of the embryonic development in a clawed toad of the genus Xenopus.

[Source: © International Baccalaureate Organization 2019]

(b)

State what would occur in the embryo immediately after stage IV.

[1]

Markscheme

elongation «of the neural tube» ✔

Examiners report

Most students did not state the correct process here, instead writing about longer term events in the nervous system, or excessively generic terms like “differentiation” and “organ development.”

Syllabus sections