Question

In Urochordata notochord is found in
A. Head of adult
B. Tail of adult
C. Tail of larva
D. Body of adult

Answer 1

Hint: While remembering the location of the notochord in urochordates, always remember that they have two stages, one which comprises the notochord and another that lacks the notochord. In addition to this, Urochordates starts with the alphabet U.Also, they have u shaped gut and thus this can be used to remember about this subphyla.

Complete answer:
Phylum Chordata has been divided into three phyla: Urochordata (Tunicata), Cephalochordata, and Vertebrata. All three groups of these organisms have been found to show the existence of a notochord that is a cartilaginous rod supporting the body in chordates in either adult stages or in animal stages. Cephalochordates are animals that have elongated and segmented bodies that contain a notochord that extends from head to tail and is present throughout the length of the body. On the other hand, Vertebrata consists of all animals that are present under the subphylum Vertebrata. They are characterized by having vertebrae that are the bones that make up the spine. Urochordata on the other hand is called tunicates because a tunic surrounds their body. They comprise the adult and the larval stage. In the larval stage, they possess a notochord in the tail however in the adult stage no notochord is found.

Hence, the correct answer is option (C).

Note: In addition to the presence of the notochord, the larva of urochordates consists of all chordate characters. It has a notochord, a dorsal nerve cord, pharyngeal slits, and a post-anal tail.