Question

Identify the correct statement:

• A. All chordates are vertebrates
• B. All vertebrates are chordates
• C. All triploblastic animals are coelomates
• D. All chordates have cranium (brain box)

Answer 1

The correct option is B All vertebrates are chordates

The presence of notochord is the characteristic feature of all chordates. All vertebrates are chordates as they have a notochord during their embryonic stages. The presence of the vertebral column is a characteristic feature of all vertebrates. All chordates are not vertebrates as the protochordates, urochordates and cephalochordates do not have a vertebral column.

The coelom is the space present between the body wall and gut wall lined by mesoderm. All triploblastic (having the three germ layers such as ectoderm, mesoderm and endoderm) animals are not coelomates (with a true coelom). Flatworms belong to phylum Platyhelminthes and roundworms belong to phylum Nematoda and members of both these phyla are triploblastic. But, flatworms are acoelomates (coelom absent) and roundworms are pseudocoelomates (false coelom).

Only vertebrates have cranium which encloses the brain.