First slide

Basis of Classification

Question

Which of the following set of animals are acoelomates without the development of mesoderm?

Moderate

A

Sycon and Taenia
B

Ascaris and Wuchereria
C

Physalia and Ctenoplana
D

Fasciola and Ancylostoma

Solution

Acoelomates without the development of mesoderm are diploblastic organisms (Cnidaria and Ctenophora).
Physalia (Cnidaria) and Ctenoplana (Ctenophora) are without coelom and mesoderm.
Taenia (Platyhelminthes) has mesoderm (triploblastic) but lacks coelom (acoelomate).
Wuchereria (filarial worm) and Ancylostoma (hookworm) are triploblastic, pseudocoelomates.

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