alleryIn the subphylum Cephalochordata, the notochord extends over what part of the body?
AOnly in the tail region
BThroughout the body length
COnly in the proboscis region
DOnly in the head region
Answer & Solution
Correct answer: B. Throughout the body length
1. Cephalochordates are small fish-like marine animals like Amphioxus.
2. In them the notochord runs throughout the body length.
3. Rule out 'only in the tail region': that describes the larva of Urochordata.
4. The proboscis-only case belongs to Hemichordata, not this subphylum.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.81_
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