Peritrophic membrane is secreted in cockroach by

Options

A. Tracheal tubes
B. Mesenteron
C. Brood pouch
D. Salivary glads.

Answer

To answer the question "Peritrophic membrane is secreted in cockroach by," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Peritrophic Membrane**:
- The peritrophic membrane is a film-like structure found in the digestive system of certain arthropods, including cockroaches. It plays a crucial role in their digestion.

2. **Function of the Peritrophic Membrane**:
- This membrane serves to separate food from the gut lining, protecting the epithelial cells from mechanical damage and pathogens. It is composed of chitin and proteins.

3. **Identifying the Source of Secretion**:
- In cockroaches, the peritrophic membrane is secreted by a specific part of the digestive system.

4. **Options Given**:
- The options provided are:
1. Trichial tube
2. Mesenteron
3. Brood pouch
4. Salivary gland

5. **Analyzing the Options**:
- The trichial tube is involved in respiration.
- The brood pouch is related to reproduction.
- The salivary glands produce saliva, which aids in digestion but do not secrete the peritrophic membrane.
- The mesenteron, which is the midgut of the cockroach, is responsible for the secretion of the peritrophic membrane.

6. **Conclusion**:
- Based on the analysis, the correct answer is that the peritrophic membrane is secreted by the mesenteron.

### Final Answer:
The peritrophic membrane is secreted in cockroach by **mesenteron** (Option 2).

---