In earthworm, 10th and 11 th segments bear loop-like broad vessels without valves, such vessels are known as

Options

A. Lateral hearts
B. Latero-oesophageal hearts
C. Anterior loops
D. Dorsal-blood vessel

Explanation

**Step-by-Step Solution:**

1. **Identify the Segments**: The question specifies the 10th and 11th segments of the earthworm. We need to focus on the structures present in these segments.

2. **Understand the Types of Vessels**: The question mentions "loop-like broad vessels without valves." We need to consider the options provided and determine which one fits this description.

3. **Evaluate the Options**:
- **Lateral Heart**: Present in the 7th and 9th segments; connects dorsal and ventral blood vessels.
- **Lateral Esophageal Heart**: Present in the 12th and 13th segments; connects dorsal blood vessel to the supraesophageal blood vessel.
- **Anterior Loop**: Present in the 10th and 11th segments; characterized as non-pulsatile, muscular, thin-walled, and non-valvular.
- **Dorsal Blood Vessel**: A major vessel running from the posterior to the anterior end of the earthworm.

4. **Select the Correct Answer**: Based on the evaluation, the "anterior loop" is the vessel that matches the description of being located in the 10th and 11th segments and is loop-like, broad, and without valves.

5. **Conclusion**: Therefore, the vessels in the 10th and 11th segments of the earthworm are known as **anterior loops**.

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