NEET 2020
- Exam
- NEET
- Year
- 2020
- Subject
- Botany
- Chapter
- Animal Kingdom
NEET 2020 · Botany · Animal Kingdom
All vertebrates are chordates but all chordates are not...
All vertebrates are chordates but all chordates are not vertebrates, why?
Options
- ANotochord is replaced by vertebral column in adult of some chordates.
- BVentral hollow nerve cord remains throughout life in some chordates.
- CAll chordates possess vertebral column.
- DAll chordates possess notochord throughout their life.
Correct answer
A. Notochord is replaced by vertebral column in adult of some chordates.
Step-by-step solution
Chordates are characterized by the presence of rod-like supporting notochord extending throughout the length of the body. Chordates are divided into three sub-phylum, i.e. Urochordates, Cephalocordates and Vertebrates.
In the vertebrates, the notochord in adults is replaced by a cartilaginous or bony vertebral column. However, in Urochordates, the notochord is found only in the tail region, while in cephalochordates the notochord extends above the head in adults.
Thus, all vertebrates are chordates but all chordates are not vertebrates.