Lateral-oesopharyngeal heart in the earthworm are situated in segment

Options

A. 7 and 9
B. 9 and 10
C. 12 and 13
D. 10 and 11

Answer

To answer the question about the location of the lateral oesopharyngeal heart in the earthworm, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure**: The earthworm has a circulatory system that includes hearts, which are responsible for pumping blood throughout the body. The lateral oesopharyngeal hearts are specific structures related to this system.

2. **Identifying the Segments**: Earthworms are segmented organisms, and their body is divided into numerous segments. Each segment has specific organs and structures.

3. **Locating the Lateral Oesopharyngeal Heart**: According to biological studies, the lateral oesopharyngeal hearts are located in the dorsal and ventral vessels of the earthworm.

4. **Determining the Specific Segment**: The lateral oesopharyngeal hearts are specifically found in segments 12 and 13 of the earthworm. This is a crucial detail as it pinpoints the exact location.

5. **Conclusion**: Therefore, the lateral oesopharyngeal heart in the earthworm is situated in segments 12 to 13.

### Final Answer:
The lateral oesopharyngeal heart in the earthworm is situated in segments 12 to 13.

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