The fatbody of cockroach contains :

Options

A. Oenocytes
B. mycetocytes
C. Trophocytes
D. All the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Fat Body**: The fat body in cockroaches is an important organ that serves multiple functions, primarily related to storage and metabolism.

2. **Identifying Cell Types**: The fat body contains different types of cells:
- **Venocytes**: These are ectodermic cells found in the fat body of cockroaches and other insects. They are believed to have a specialized secretory function.
- **Mycetocytes**: These cells harbor endosymbionts, which are symbiotic microorganisms that can assist in digestion and nutrient absorption.
- **Trophocytes**: These are the major cells in the fat body, primarily responsible for storage. They store glycogen and lipids, which can be mobilized during periods of starvation.

3. **Conclusion**: Since the fat body of cockroaches contains venocytes, mycetocytes, and trophocytes, the correct answer to the question is "all the above".

**Final Answer**: The fat body of cockroach contains all of the following: venocytes, mycetocytes, and trophocytes.

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