The urine of cockroach is pushed into ileum due to the contraction of 

Options

A. mesenteron
B. stomodeal valve
C. malpighian tubules
D. rectum

Answer

To solve the question regarding how the urine of a cockroach is pushed into the ileum, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Excretory System of Cockroach**:
- The cockroach has a unique excretory system that includes structures called Malpighian tubules, which are responsible for the formation of urine.

2. **Identify the Role of Malpighian Tubules**:
- Malpighian tubules are long, slender tubes that extend from the alimentary canal (the digestive tract) into the hemolymph (the fluid equivalent to blood in insects). They help in the removal of nitrogenous waste and play a crucial role in osmoregulation.

3. **Mechanism of Urine Movement**:
- The urine formed in the Malpighian tubules is then transported to the hindgut (which includes the ileum and rectum) for further processing.

4. **Contraction of Malpighian Tubules**:
- The contraction of the Malpighian tubules helps in pushing the urine into the ileum. This contraction creates pressure that facilitates the movement of urine from the tubules into the digestive tract.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the urine of the cockroach is pushed into the ileum due to the contraction of the Malpighian tubules.

### Final Answer:
The urine of the cockroach is pushed into the ileum due to the contraction of **Malpighian tubules**.

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