Excretory organs of cockroach are:

Options

A. Malpighian corpuscles
B. Malpighian tubules
C. Hepatic caecae
D. Metanephridia

Answer

**Step-by-Step Solution:**

1. **Identify the Phylum of Cockroach**: Cockroaches belong to the phylum Arthropoda. This is important because the excretory organs can vary significantly across different phyla.

2. **Understand Excretory Organs**: Excretory organs are responsible for the elimination of nitrogenous waste from the body. In arthropods, these organs are adapted to their specific physiological needs.

3. **Differentiate Between Excretory Structures**:
- **Malpighian Corpuscles**: These are found in the kidneys of vertebrates and are not present in cockroaches. They consist of the Bowman’s capsule and glomerulus.
- **Malpighian Tubules**: These are the correct excretory organs in cockroaches. They are long, slender tubes that open into the hindgut and are responsible for the excretion of nitrogenous waste.
- **Metanephridia**: These are excretory structures found in annelids (like earthworms) and are not present in cockroaches.

4. **Conclusion**: The excretory organs of the cockroach are the Malpighian tubules, which efficiently remove waste products from the hemolymph (the blood equivalent in insects) and help maintain osmotic balance.

**Final Answer**: The excretory organs of cockroach are Malpighian tubules.

---