Anus lies in Ascaris at

Options

A. Tip of tail
B. In front of posterior end
C. Just near the excretory pore
D. In the middle of body

Answer

To determine the location of the anus in Ascaris, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Anatomy of Ascaris**: Ascaris is a type of parasitic nematode (roundworm) that has a distinct body structure. It has a definite anterior (head) end and a posterior (tail) end.

2. **Identify the Position of the Anus**: The anus in Ascaris is located towards the posterior end of the body. Specifically, it is positioned in front of the posterior end.

3. **Differentiate Between Male and Female Ascaris**:
- In male Ascaris, the tail is curved, and the anus is replaced by a structure called the cloaca, which also has spicules.
- In female Ascaris, the tail is straight, and the anus is transverse, located between the tail and a chemoreceptor called the amphid.

4. **Conclude the Correct Answer**: Based on the anatomical features and the position of the anus, the correct answer is that the anus lies in Ascaris "in front of the posterior end."

### Final Answer:
The anus lies in Ascaris at **in front of the posterior end**.

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