Question

Phylum chordata is divided into how many subphyla ?

• A. Three
• B. Five
• C. Two
• D. Four

Answer 1

The correct option is A Three

Phylum Chordata

Phylum Chordata includes a group of animals that exhibit a flexible rod-like structure called notochord on their dorsal side. It is the third largest phylum in the Kingdom Animalia. It is divided into three subphyla:

• Urochordata/ Tunicata: The animals in Urochordata show the presence of notochord only in their larval tail. For example, Salpa.

Phylum Chordata

• Cephalochordata: In Cephalochordates, notochord extends from head to tail region and is present throughout the lifetime. For example, Branchiostoma.
  
• Vertebrata: In Vertebrata, notochord is seen only during embryonic stages and is replaced by vertebral column (cartilaginous or bony) in adults. For example, class Mammalia.

Final answer

(b) Three