First slide

Classification of Animals

Question

Identify the correct combination from the following.

Easy

A

Hydra - Metagenesis
B

Pila – Metamerism
C

Balanoglossus – Notochord
D

Hirudinaria – Ventral nerve cord

Solution

Hirudinaria (leech) is an annelid and has a double ventral nerve cord.
Metagenesis is the exhibited by cnidarians that have both polyp and medusa stages (e.g., Obelia). Medusa stage is absent in Hydra.
Pila is unsegmented.
Balanoglossus has a stomochord and lacks a notochord.

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