- A Urochordata
- B Cephalochordata
- C Vertebrata only
- D Hemichordata
Correct answer: B. Cephalochordata
Explanation: In Cephalochordata (e.g., Branchiostoma), the notochord extends from head to tail and persists throughout life. In Urochordata, it is present only in the larval tail.
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.