All vertebrates are chordates but all chordates are not vertebrates. Justify the statement. | NCERT solution | Class 12 Biology | Unit-4 Animal Kingdom

Q.9:- “All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.

 

Answer
The characteristic features of the phylum, Chordata, include the presence of a notochord and paired pharyngeal gill slits. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it can be said that all vertebrates are chordates but all chordates are not vertebrates.