Excretory pore of Ascaris occurs at

Options

A. Posterior end
B. Middle of body
C. Behind the mouth
D. Near the posterior end

Answer

To determine the location of the excretory pore of Ascaris, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: Recognize that Ascaris is a type of roundworm belonging to the phylum Nematoda (also known as Aschelminthes or Nematelminthes).

2. **Understand the Anatomy**: Ascaris has a complete digestive system with separate openings for ingestion (mouth) and excretion (anus).

3. **Locate the Excretory System**: In Ascaris, there are excretory canals that run along the lateral lines of the body.

4. **Examine the Position of the Excretory Pore**: The excretory pore is not located at the posterior end or in the middle of the body. Instead, it is situated mid-ventrally, specifically just behind the mouth.

5. **Conclude the Location**: Therefore, the excretory pore of Ascaris occurs just behind the mouth on the mid-ventral side.

### Final Answer:
The excretory pore of Ascaris occurs just behind the mouth on the mid-ventral side.

---