Which is not an excretory organ of vertebrates ?

Options

A. Liver
B. Lungs
C. Hepatopancreas
D. Skin

Answer

To determine which is not an excretory organ of vertebrates, we will analyze each of the provided options: liver, lungs, hepatopancreas, and skin.

### Step-by-Step Solution:

1. **Evaluate the Liver**:
- The liver is a crucial organ in the excretory system. It plays a significant role in detoxifying substances and excreting waste products such as bilirubin.
- **Conclusion**: The liver is an excretory organ.

2. **Evaluate the Lungs**:
- The lungs are responsible for the exchange of gases, primarily the removal of carbon dioxide from the bloodstream.
- **Conclusion**: The lungs are also considered excretory organs due to their role in gas exchange.

3. **Evaluate the Hepatopancreas**:
- The hepatopancreas is a glandular organ found in invertebrates, particularly in arthropods and mollusks. It serves functions similar to the liver and pancreas in vertebrates but is not present in vertebrates themselves.
- **Conclusion**: The hepatopancreas is not an excretory organ of vertebrates.

4. **Evaluate the Skin**:
- The skin functions as an excretory organ by excreting sweat, which contains waste products.
- **Conclusion**: The skin is an excretory organ.

### Final Answer:
The organ that is **not** an excretory organ of vertebrates is the **hepatopancreas**.

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