Velum of Branchiostoma is a

Options

A. part of oral hood
B. part of notochord
C. circular diaphragm
D. myotome

Answer

To answer the question "Velum of Branchiostoma is a?", we can follow these steps:

### Step 1: Identify the Organism
Branchiostoma is a member of the subphylum Cephalochordata within the phylum Chordata. It is commonly known as "Lancelet."

**Hint:** Remember that Branchiostoma is part of the Cephalochordata subphylum, which is characterized by having a notochord throughout their life.

### Step 2: Understand the Structure
The velum in Branchiostoma refers to a specific structure that is involved in the animal's feeding and respiration. It is a muscular structure.

**Hint:** Think about how structures in aquatic organisms help with feeding and water movement.

### Step 3: Describe the Function
The velum acts as a circular diaphragm located between the mouth and pharynx. It plays a crucial role in controlling the movement of water from the mouth into the pharynx, aiding in the feeding process.

**Hint:** Consider how the diaphragm in humans functions and relate it to the function of the velum in Branchiostoma.

### Step 4: Identify the Correct Answer
Based on the information, the velum of Branchiostoma is best described as a circular diaphragm. Therefore, the correct answer is that the velum is a "circular diaphragm."

**Hint:** Review the options provided in the question to confirm that "circular diaphragm" is indeed listed as one of the choices.

### Final Answer
The velum of Branchiostoma is a circular diaphragm.