Question

Urochordata, Hemichordata and Cephalochordata are collectively known as

• A. Acrania
• B. Protochordata
• C. Lower Chordata
• D. All of the above

Answer 1

The correct option is D All of the above

The chordate is a group or phylum in which there are the organisms which have the nerve cord or the spinal cord. There are three subphylums in this group known as the Hemichordate, Urochordate and the Cephalochordate. Acrania or Protochordata are lower chordates. They are all marine organisms. These are small and primitive chordates. They lack a head, skull or cranium. Thus, they are called as Acrania which means they do not have a body which have distinct head. They do not have a vertebral column, jaws and brain. The Acrania is divided into three subphyla as Hemichordata, Urochordata and Cephalochordata.

Thus, the correct answer is option D.