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Q.

Which one of the following undergoes retrogressive metamorphosis?

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a

Ascidia

b

Amphioxus

c

Aurelia

d

Ascaris

answer is A.

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Detailed Solution

The transformation of a complex and advanced larva into a simple and primitive adult is termed retrogressive metamorphosis. The ascidian tadpole larva of Ascidia (Urochordata) undergoes retrogressive metamorphosis. The larva has a notochord, a dorsal nerve chord and a tail. During metamorphosis, the notochord and the tail are lost and the dorsal nerve cord is reduced to a solid ganglion. The adult lacks a notochord and a tail.

 

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