Region of Earthworm which is forest of nephridia is

Options

A. Clitellar region
B. Pharyngeal region
C. Typhlosolar region
D. Intestinal region

Answer

To solve the question regarding the region of the earthworm which is referred to as the "forest of nephridia," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Earthworm**:
- Earthworms have a segmented body structure. Each segment contains various organs, including nephridia, which are excretory structures.

2. **Identify the Nephridia**:
- Nephridia in earthworms are responsible for excretion and osmoregulation. They are found in each segment of the earthworm's body.

3. **Count the Nephridia in Different Regions**:
- In the segments from the 7th to the last segment, there are typically about 200 to 250 nephridia present in each segment.
- However, in the clitellum region (the clitellaria), there are significantly more nephridia, ranging from 2000 to 2500 in each segment.

4. **Define the Clitellum Region**:
- The clitellum is a thickened, glandular section of the earthworm that is involved in reproduction. It is also where the concentration of nephridia is highest.

5. **Conclusion**:
- Since the clitellum region has a much higher density of nephridia compared to other segments, it is referred to as the "forest of nephridia."

6. **Final Answer**:
- The region of the earthworm which is known as the forest of nephridia is the **clitellum region**.