In earthworm the enteronephric nephridia open in:-

Options

A. Body surface
B. Buccal cavity
C. Intestine
D. Both 2 & 3

Answer

To answer the question "In earthworm, the enteronephric nephridia open in:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nephridia**: Nephridia are the excretory organs in earthworms that help in the elimination of nitrogenous waste and also play a role in osmoregulation.

2. **Types of Nephridia**: There are three types of nephridia in earthworms:
- **Enteronephric Nephridia**: These nephridia expel nitrogenous waste into the alimentary canal.
- **Exonephric Nephridia**: These nephridia discharge waste directly to the outside environment.

3. **Function of Enteronephric Nephridia**: The enteronephric nephridia specifically release waste products into the digestive tract, which includes both the buccal cavity (mouth area) and the intestine.

4. **Location of Enteronephric Nephridia**: Since enteronephric nephridia discharge their waste into the alimentary canal, they open into both the buccal cavity and the intestine of the earthworm.

5. **Conclusion**: Therefore, the correct answer to the question is that enteronephric nephridia open in both the buccal cavity and the intestine.

### Final Answer:
Enteronephric nephridia in earthworms open in both the buccal cavity and the intestine.

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