Question

The feature that is not a characteristic of protochordata?
A. Presence of notochord
B. Bilateral symmetry and coelom
C. Jointed legs
D. Presence of the circulatory system

Answer 1

Hint:Arthropods are invertebrates that have bilaterally symmetrical bodies, Ventral nervous system, jointed legs, open circulatory system, and highly developed sense organs.

Complete answer:
The organisms of the Protochordata are commonly referred to as the lower chordates. They are not a "proper" taxonomic group and are only classified for convenience. But they form a major Chordata division. They are also called Acraniata because they do not have a real skull. The three subphylums are Hemichordata, Urochordata, and Cephalochordata. In marine water, protochordata are usually found. Their body is bilaterally symmetrical, triploblastic and coelomate. At a certain point of their existence, their body builds a long, rod-like structure called the notochord. It displays various organ systems. Amphioxus, Herdmania, etc. some examples of protochordata.
In protochordata, a notochord and closed circulatory system are present. Their bodies are bilaterally symmetrical and coelomates. They are marine animals.
Joint legs are the characteristic features of the phylum Arthropod that includes most of the insects. It is the largest phylum in the animal kingdom. Arthropods are invertebrates that have bilaterally symmetrical bodies, Ventral nervous system,open circulatory system, and highly developed sense organs.

Thus, the correct answer is option C. i.e., Jointed legs.

Note:The central nervous system in protochordata is hollow, single, and dorsal. The heart is ventral with a closed circulatory system. They have post-anal tail that ensures their balance. Their bodies are triploblastic, coelomate, and bilaterally symmetrical.