Q. Which one is correct?
A) Notochord is ectodermal in origin present in some animals
B) Notochord is a mesodermally derived rod like structure formed on the dorsal side in embryonic development in some animals
C) Arthropoda are non-chordates
D) Both (b) and (c)
Explanation
All phyla from Porifera to Echinodermata, including phylum-Arthropoda are non-chordates, i.e., lacking notochord
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.