First slide

Classification of Animals

Question

Notochord is

Easy

A

a well-developed structure located in the trunk region of Balanoglossus
B

a rod-like structure derived from the mesoderm
C

present only in the larval tail of Branchiostoma
D

replaced by a bony vertebral column in Petromyzon

Solution

The notochord is a mesodermal rod-like structure formed on the dorsal side during embryonic development in chordates.
In Branchiostoma, the notochord extends from head to tail region.
In cyclostomes (e.g., Petromyzon), the cranium and the vertebral column are cartilaginous.
Balanoglossus (Hemichordata) has stomochord (buccal diverticulum) but not notochord.

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