Terminal ducts of septal nephridia of earthworm open in-

Options

A. Intestine
B. Paired septa excretory canals
C. Paired supra intestinal excretory canals
D. Dorsal blood vessel

Answer

To answer the question regarding where the terminal ducts of septal nephridia of earthworms open, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Nephridia**: The septal nephridia are excretory structures found in earthworms. They are organized in a specific manner across the segments of the worm.

2. **Identify the Location**: The septal nephridia are located in four rows above the intersegmental septa, present in every segment of the earthworm, but they start from the segment just behind the 15th segment.

3. **Function of Terminal Ducts**: The terminal ducts of the septal nephridia are short tubes that collect waste from the nephridia.

4. **Connection to Excretory Canals**: The terminal ducts of the septal nephridia open into paired septal excretory ducts. These ducts are situated along the septum in every segment.

5. **Further Pathway**: The paired septal excretory ducts then lead to paired supra-intestinal excretory ducts, which are involved in the excretion process.

6. **Conclusion**: Based on the information gathered, the terminal ducts of the septal nephridia of earthworms open into the paired septal excretory ducts.

### Final Answer:
The terminal ducts of septal nephridia of earthworms open into **paired septal excretory ducts**.

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