Excretory organ in hemichordates is

Options

A. Proboscis gland
B. Green gland
C. Malphigian tubules
D. Antennary gland

Answer

### Step-by-Step Solution:

1. **Understanding Hemichordates**: Hemichordates are marine invertebrates that possess a true body cavity known as a coelom. They are characterized by a body divided into three main parts: the proboscis, collar, and trunk.

2. **Identifying Excretory Organs**: The question asks for the excretory organ in hemichordates. In hemichordates, the excretory organ is located in the proboscis.

3. **Role of Glomerulus**: Within the proboscis, there exists a structure called the glomerulus. This structure plays a crucial role in the excretion process, similar to how kidneys function in mammals. The glomerulus is involved in the filtration and regulation of waste excretion.

4. **Conclusion**: Therefore, the excretory organ in hemichordates is the **proboscis**, which contains the glomerulus responsible for waste filtration and excretion.

### Final Answer:
The excretory organ in hemichordates is the **proboscis**.

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