Tunicin is present in

Options

A. Test or covering of urochordates
B. Excreta of hemichordates
C. Blood of cephalochordates
D. Blood of urochordates

Answer

**Step-by-Step Solution:**

1. **Understanding Tunicin**: Tunicin is a structural component that is primarily made of cellulose. It is significant in the classification of certain marine animals.

2. **Identifying the Organism Group**: Tunicin is found in a specific group of animals known as tunicates. Tunicates are also referred to as Urochordates or Eudorhordates.

3. **Characteristics of Tunicates**: Tunicates possess a protective outer covering known as a tunic or mantle. This tunic is where tunicin is located.

4. **Evaluating Options**:
- The question likely presents multiple-choice options regarding where tunicin is found.
- The first option states that tunicin is present in Urochordates (tunicates).
- Other options may refer to hemichordates or cephalochordates, which do not contain tunicin.

5. **Conclusion**: Based on the information, tunicin is specifically found in the tunicates (Urochordates). Therefore, the correct answer is that tunicin is present in Urochordates.

**Final Answer**: Tunicin is present in Urochordates (tunicates).

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