SSC MTS EXAM

Detailed explanation-1: -Urochordates, like Herdmania have notochord and nerve cord present only in nerve stages. Body is covered by a test made up of tunicin. Notochord is present only in tail. Tadpole undergoes retrogressive metamorphosis and notochord and nerve cord is absent in adults, which is lost during metamorphosis.

Detailed explanation-2: -Tunicates have a notochord only during their larval stage.

Detailed explanation-3: -The notochord is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals. Chordates are animals that have a notochord. Urochordata is a sub-phylum of the phylum Chordata.