In hemichordates, the dorsal nerve cord is

Absent

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Present throughout

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Restricted to tongue region

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Restricted to collar region

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Solution

The correct option is D Restricted to collar region
In hemichordates and chordates nerve cord is dorsally placed.
A) Hemichordates have a nerve cord. It is not absent in them.
B) Nerve cord although dorsal, is not present in hemichordates throughout the body.
C) Nerve cord is not present in the tongue region.
D) The nerve cord is present only in the collar region of the body.
So the correct answer is 'Restricted to collar region'.

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