Question

Which of the following organisms neither have notochord nor vertebral column in their adult stage?

• A. Cephalochordate
• B. Herdmania
• C. Petromyzon
• D. Bdellostoma

Answer 1

Answer: (B)

Herdmania

Herdmania belongs to the genus of the ascidian. It is devoid of the notochord and vertebral column in their adult stage. Herdmania is an exclusively marine and found in shallow nature. It is a solitary and sedentary attached to a rocky sea bottom or imbedded in a sandy flour. It is a oscillatory feeder, macrophages animals. The water current bringing food and oxygen enters the body through the branchial aperture. It is hermaphrodite and fertilization is external and development is indirect.

So, the correct answer is option B.