Question

Which of the following statements is incorrect regarding organisms of phylum Chordata?

• A. The organisms are characterized by the presence of a notochord and a ventral hollow nerve cord.
• B. They are triploblastic and bilaterally symmetrical.
• C. They have a ventral heart.
• D. They are further divided into three subphyla.

Answer 1

Answer: (A)

The organisms of Phylum Chordata are not characterized by notochord only. They are characterized by the presence of:
1. A notochord
2. A dorsal hollow nerve cord
3. Paired pharyngeal gill slits