The larva of urochordates contains notochord

Options

A. Throughout
B. Head region
C. Tail region
D. Trunk region

Answer

**Step-by-Step Solution:**

1. **Understanding Urochordates**: Urochordates are a subphylum of the phylum Chordata. They are characterized by having a notochord, which is a flexible rod-like structure that provides support.

2. **Defining Notochord**: The notochord is a key feature of chordates, and it must be present at some stage in the life cycle of these animals. In urochordates, the notochord is specifically found in the larval stage.

3. **Identifying the Location of Notochord in Urochordates**: In urochordates, the notochord is present only in the tail region of the larva. The term "uro" refers to the tail, indicating that the notochord is located there.

4. **Distinguishing from Other Groups**: In contrast, cephalochordates have the notochord present in the head region, while in other chordates, it may be present in different locations or replaced by a vertebral column in adults.

5. **Conclusion**: Therefore, the correct answer to the question is that the larva of urochordates contains a notochord specifically in the tail region.

**Final Answer**: The larva of urochordates contains notochord in the tail region.

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