Which of the following does not participate in excretion in
cockroach?

Options

A. Fat body
B. Phallic gland
C. Uricose gland
D. Malpighian tubules.

Answer

To determine which of the following does not participate in excretion in cockroaches, we need to analyze the functions of each option provided:

1. **Malpighian Tubules**: These are the primary excretory structures in cockroaches. They are fine, hair-like tubules that collect waste products from the hemolymph (the blood equivalent in insects) and excrete them as uric acid. Therefore, Malpighian tubules are involved in excretion.

2. **Fat Body**: The fat body in cockroaches serves multiple functions, including energy storage, metabolism, and detoxification. It also plays a role in excretion by helping to process waste materials. Thus, the fat body does participate in excretion.

3. **Uricose Gland**: This gland is involved in the excretion of nitrogenous waste, specifically uric acid, in cockroaches. It assists in the overall excretory process, so it is also involved in excretion.

4. **Phallic Gland**: The phallic gland is part of the male reproductive system in cockroaches. It is responsible for secreting substances that form the outer layer of the spermatophore (a sperm-containing structure). Since it is not involved in the excretory system, it does not participate in excretion.

Based on this analysis, the answer to the question is:

**Answer**: Phallic gland