Note the following:
(A) Monocytes (B) Trophocytes
(C) Lymphocytes (D) Mycetocytes
(E) Leucocytes (F) Oenocytes
(G) Urate cells
Which of above are fat cells in Periplanata

Options

A. A, C, E and H
B. B, D, F and G
C. C, E, F and G
D. A, C, E and F

Explanation

To determine which of the listed cells are fat cells in Periplaneta (the American cockroach), we will analyze each option step by step.

1. **Monocytes (A)**: These are a type of white blood cell involved in the immune response. They do not function as fat cells.
- **Hint**: Remember that monocytes are part of the immune system, not involved in fat storage.

2. **Trophocytes (B)**: These cells are known to store fat in various organisms, including insects. In the context of Periplaneta, trophocytes are indeed fat cells.
- **Hint**: Think of trophocytes as similar to adipocytes in humans, which store fat.

3. **Lymphocytes (C)**: These are another type of white blood cell that plays a crucial role in the immune system. Like monocytes, they do not store fat.
- **Hint**: Lymphocytes are primarily involved in immune defense, not fat storage.

4. **Mycetocytes (D)**: These cells are associated with the storage of fat and other substances in certain insects, including Periplaneta. They can be considered fat cells.
- **Hint**: Mycetocytes have a role in nutrient storage, including fats.

5. **Leucocytes (E)**: These are white blood cells, similar to monocytes and lymphocytes, and are not involved in fat storage.
- **Hint**: Leucocytes are part of the immune response, not fat cells.

6. **Oenocytes (F)**: These cells are involved in lipid metabolism and can also be considered fat cells in insects.
- **Hint**: Oenocytes are specifically related to fat storage and metabolism.

7. **Urate cells (G)**: These cells are involved in the excretion of uric acid and do not function as fat cells.
- **Hint**: Urate cells are more about waste management than fat storage.

**Final Conclusion**: The fat cells in Periplaneta from the options given are:
- Trophocytes (B)
- Mycetocytes (D)
- Oenocytes (F)

Thus, the correct answer includes B, D, and F.