Which of the following are enteronephric nephridia in earthworm

Options

A. Integumentary and Pharyngeal
B. Septal and integumentary
C. Pharyngeal and septal
D. Integumentary only

Explanation

To determine which of the following are enteronephric nephridia in earthworms, we need to analyze the options provided and understand the function of different types of nephridia in earthworms.

### Step-by-Step Solution:

1. **Understanding Enteronephric Nephridia**:
- Enteronephric nephridia refer to those nephridia that discharge their waste products into the lumen of the intestine. This means that the waste is expelled along with the digestive waste.

2. **Identifying Types of Nephridia**:
- **Intugamentary Nephridia**: These nephridia are involved in excretion but do not discharge waste into the intestine.
- **Pharyngeal Nephridia**: These nephridia discharge waste directly into the buccal cavity, which is not the same as entering the intestine.
- **Septal Nephridia**: These nephridia discharge waste products into the lumen of the intestine, which qualifies them as enteronephric nephridia.

3. **Analyzing the Options**:
- **Option 1: Intugamentary and Pharyngeal**: Incorrect, as neither discharges into the intestine.
- **Option 2: Septal and Intugamentary**: Incorrect, as intugamentary does not qualify.
- **Option 3: Pharyngeal and Septal**: Incorrect, as pharyngeal does not discharge into the intestine.
- **Option 4: Intugamentary only**: Incorrect, as intugamentary does not qualify.

4. **Conclusion**:
- The only enteronephric nephridia in earthworms are the **Septal Nephridia**. Therefore, the correct answer is **Option 2: Septal Nephridia**.