Question

Retrogressive metamorphosis is peculiar to

• A. Urochordates
• B. Hemichordates
• C. Cephalochordates
• D. All the above.

Answer 1

The correct option is A Urochordates

In retrogressive metamorphosis, the embryo or larva possesses more advanced features as compared to its adult stage. These features are lost during the course of development.

A) Urochordates have a notochord in their tails in embryonic conditions. It is lost in adults. Hence, we see the retrogressive metamorphosis in urochordates.

B) In Hemichordates the features seen in embryonic stages are seen in a more developed form in adult stages. Hence, no retrogressive metamorphosis.

C) In cephalochordates, the features seen in embryonic stages are seen in a more developed form in adult stages. Hence, no retrogressive metamorphosis.

So, the correct answer is 'Urochordates'.