Question

discuss larval form of hemichordata urochordata and cephalochordata​

Answer 1

Answer:

In urochordates, the dorsal tubular nerve cord is present in the larval form and degenerates in the form of small ganglion in the adult. In cephalochordates, notochord and nerve cord extend the entire length of body and is present throughout life. Hemichordates, on the other hand, lack notochord and true dorsal nerve cord.

Hemichordates and urochordates are non-metameric whereas cephalochordates are metameric.

Hemichordates are worm-like animals whereas urochordates are bag-like in shape. Cephalochordates are fish-like in shape.

Urochordates are hermaphrodites whereas sexes are separate in cephalochordates.

In urochordates, the adult body is covered by a tunic or test. The adult body of hemichordates and cephalochordates is not covered by an exoskeleton.

Explanation:

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Answer 2

Answer:

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