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Q.

A chordate animal having protonephridia as excretory structure is

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a

flatworm  

b

Amphioxus

c

rotifer

d

earthworm

answer is D.

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Detailed Solution

Flatworms, rotifers and Amphioxus have protonephridia for osmoreguation and excretion. 

Amphioxus is a chordate (cephalochordate). It has protonephridia with solenocytes as the terminal cells.

In nonchordates, (flatworms and rotifers) protonephridia possess flame cells.

Nephridia are the excretory structures of earthworms.

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