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Q.

Select the pair that includes animals lacking coelom and mesoderm.

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a

Ascaris and Wuchereria

b

Sycon and Taenia

c

Physalia and Ctenoplana

d

Fasciola and Ancylostoma

answer is C.

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Detailed Solution

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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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Select the pair that includes animals lacking coelom and mesoderm.