Peritrophic membrane is asociated with a part of digestive system in :

Options

A. Nereis
B. Ascaris
C. Antedon
D. Periplaneta

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the association of the peritrophic membrane with a part of the digestive system in certain organisms.

2. **Identify the Options**: The options provided are:
- Nereus
- Ascaris
- Antedon
- Pariplaneta (Cockroach)

3. **Know the Function of Peritrophic Membrane**: The peritrophic membrane is a protective layer that is secreted by the glandular cells in the digestive system. Its primary function is to protect the gut wall from abrasive food particles and to aid in digestion.

4. **Identify the Organism with Peritrophic Membrane**:
- The peritrophic membrane is specifically associated with the digestive system of insects, particularly in the mesenteron (midgut).
- Among the options, Pariplaneta (the scientific name for the cockroach) is known to have a peritrophic membrane.

5. **Eliminate Incorrect Options**:
- Nereus (a genus of marine worms) and Ascaris (a genus of parasitic roundworms) do not have a peritrophic membrane.
- Antedon (a genus of feather stars) also does not possess this structure.
- Therefore, the only correct option is Pariplaneta.

6. **Conclusion**: Based on the information gathered, the correct answer to the question is **Pariplaneta**.

### Final Answer:
The peritrophic membrane is associated with the digestive system in **Pariplaneta** (Cockroach).