Question

The feature that is not a characteristic of protochordata?

• A. Absence of notochord
• B. Presence of circulatory system
• C. Jointed legs
• D. Both B and C

Answer 1

The correct option is D

Both B and C

The correct answer is option D.

Explanation of correct option :

1. Protochordates are lower chordates which do not develop true vertebral column or backbone.
2. They do have notochord for support.
3. Their body is bilaterally symmetrical, triploblastic, and coelomated.
4. They lack paired appendages or jointed legs.
5. They do not have closed circulatory system.

Explanation of incorrect option :-

Option A

1. Notochord is a flexible rod like structure of mesodermal cells that is the principal structural element of chordates.
2. It plays an organizational role in nervous system development.
3. In later vertebrate development, they become part of vertebral column.

Final Answer : Presence of jointed legs and circulatory system is not a characteristic of protochordates.