Vasa defferentia join with — in `18^(th)` segments 

Options

A. Prostate ducts
B. Seminal ducts
C. Accessory gland
D. Prostate gland

Answer

To solve the question "Vasa deferentia join with — in 18th segments," we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Earthworm**:
- Earthworms are segmented organisms, typically having around 100 to 120 segments. Each segment has specific structures and functions.

2. **Identify Vasa Deferentia**:
- Vasa deferentia are the ducts that transport sperm from the testes in male organisms. In earthworms, these structures are crucial for reproduction.

3. **Locate the Joining Point**:
- The question specifies that we need to find out where the vasa deferentia join in the 18th segment of the earthworm.

4. **Review the Options**:
- The options given are:
- A) Prostate ducts
- B) Seminal ducts
- C) Accessory gland
- D) Prostate gland

5. **Determine the Correct Answer**:
- Based on biological knowledge, the vasa deferentia in earthworms join with the prostate ducts at the 18th segment. This is a well-established fact in the study of earthworm anatomy.

6. **Final Answer**:
- Therefore, the correct answer is **A) Prostate ducts**.