Q. Which one of the following is not a characteristic feature of the sub-phylum-Vertebrata?
A) Dorsal tubular nerve cord
B) Ventral muscular heart
C) Presence of notochord in the adult
D) Presence of kidneys
Explanation
Notochord is only present in the embryonic stage, it is replaced by vertebral column (back bone) in the adult forms.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.