The nephridia which are found in region of intestine are

Options

A. Integumentary nephridia
B. Phryngeal nephridia
C. Septal nephridia
D. Both 1 and 3

Explanation

To answer the question "The nephridia which are found in the region of intestine are," we need to analyze the types of nephridia present in earthworms and their locations.

### Step-by-Step Solution:

1. **Understanding Nephridia**: Nephridia are excretory organs found in earthworms and other members of the phylum Annelida. They help in excretion and osmoregulation.

2. **Types of Nephridia**: There are three types of nephridia based on their location:
- **Septal Nephridia**: Present from the 15th segment onward and discharge waste into the lumen of the intestine.
- **Pharyngeal Nephridia**: Present in the 4th, 5th, and 6th segments.
- **Integumentary Nephridia**: Present in all segments except the first two.

3. **Identifying the Region of the Intestine**: The intestine in earthworms starts from the 15th segment. Therefore, we need to identify which nephridia are located in this segment and beyond.

4. **Analyzing Each Type**:
- **Septal Nephridia**: Since they start from the 15th segment and discharge waste into the intestine, they are indeed found in the region of the intestine.
- **Pharyngeal Nephridia**: These are located in the 4th, 5th, and 6th segments, which are before the intestinal region, so they do not qualify.
- **Integumentary Nephridia**: These are present in all segments except the first two, meaning they are also found in the intestinal region.

5. **Conclusion**: The nephridia found in the region of the intestine are:
- Septal Nephridia (correct)
- Integumentary Nephridia (correct)
- Pharyngeal Nephridia (incorrect)

6. **Final Answer**: Therefore, the correct answer is **both 1 and 3 (Septal and Integumentary Nephridia)**.