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Question 4

Biology SL Paper 3 (November 2024, TZ2)

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  1. Image A shows a stage of neurulation in a chick embryo, and image B is a scanning electron micrograph (SEM) of a transverse section through the level indicated by the line in image A.
Image A shows a chick embryo with a line indicating a transverse section. Image B is a scanning electron micrograph (SEM) of that transverse section, showing the neural tube and ectoderm.
Image A shows a chick embryo with a line indicating a transverse section. Image B is a scanning electron micrograph (SEM) of that transverse section, showing the neural tube and ectoderm.

(a) On image B, label
(i) the neural tube; [1]

(ii) the ectoderm. [1]

(b) Describe the formation of neurons. [2]

(c) Explain neural plasticity. [2]