Question

In some chordates, the notochord is modified as the vertebral column, such animals are called vertebrates. Which of the following statements make sense?

• A. All chordates are vertebrates nut all vertebrates are not chordates
• B. All vertebrates are chordates and all chordates are vertebrates
• C. All vertebrates are chordates but all chordates are not vertebrates
• D. Chordates are not vertebrates and vertebrates are not chordates

Answer 1

The correct option is C All vertebrates are chordates but all chordates are not vertebrates

Vertebrates are originated from chordates i.e it is the subphylum of chordates. They both possess the common features a notochord, a dorsal hollow nerve cord, pharyngeal gill slits and post-anal tail. They further evolved where the notochord changed into the bony backbone known as a vertebral column. Therefore, all chordates are not vertebrates but all vertebrates are chordates. Thus the correct answer is option C.