Ammonia is changed to uric acid in the liver of

Options

A. Ammonotelic animals
B. Uricotelic animals
C. Ureotelic animals
D. Ornithotelic animals

Answer

To answer the question "Ammonia is changed to uric acid in the liver of," we will analyze the options provided and determine which type of animals convert ammonia to uric acid.

### Step-by-Step Solution:

1. **Understanding Ammonia and Its Toxicity**:
- Ammonia is a highly toxic nitrogenous waste product produced during protein metabolism. Due to its toxicity, it must be converted into less harmful substances before excretion.

2. **Conversion of Ammonia**:
- In many organisms, ammonia is converted into urea or uric acid to facilitate safer excretion. The conversion process occurs in the liver.

3. **Types of Nitrogenous Waste Excretion**:
- There are three main types of nitrogenous waste excretion:
- **Ammonotelic**: Organisms that excrete ammonia directly (e.g., aquatic animals like fish).
- **Ureotelic**: Organisms that convert ammonia to urea (e.g., mammals).
- **Uricotelic**: Organisms that convert ammonia to uric acid (e.g., birds, reptiles, and terrestrial arthropods).

4. **Identifying Uricotelic Animals**:
- Uricotelic animals are specifically those that convert ammonia into uric acid in the liver. This process allows them to conserve water since uric acid is less toxic and can be excreted with minimal water loss.

5. **Analyzing the Options**:
- **Monotelic Animals**: Incorrect, as they excrete ammonia directly.
- **Uricotelic Animals**: Correct, as they convert ammonia to uric acid.
- **Ureotelic Animals**: Incorrect, as they convert ammonia to urea.
- **Methotelic Animals**: This term is not commonly used in the context of nitrogenous waste excretion.

6. **Conclusion**:
- The correct answer is **Uricotelic Animals**, as they are the ones that change ammonia to uric acid in the liver.

### Final Answer:
Ammonia is changed to uric acid in the liver of **Uricotelic Animals**.