Excretion of nitrogenous waster in semisolid form is found in

Options

A. amniotes
B. aquatic animals
C. ureotelic animals
D. uricotelic animals

Answer

To solve the question "Excretion of nitrogenous waste in semisolid form is found in," we will analyze the types of nitrogenous waste excretion in different groups of animals.

### Step-by-Step Solution:

1. **Understand Nitrogenous Wastes**:
- Nitrogenous wastes are the byproducts of protein metabolism. The primary forms of nitrogenous waste are ammonia, urea, and uric acid.

2. **Identify Types of Excretion**:
- **Ammonotelic**: Organisms that excrete ammonia directly. This is common in aquatic animals (e.g., fish) because ammonia is highly toxic and requires a lot of water to dilute.
- **Ureotelic**: Organisms that convert ammonia into urea for excretion. This is common in mammals, including humans, as urea is less toxic and requires less water.
- **Uricotelic**: Organisms that excrete uric acid, which is less toxic and can be excreted in a semi-solid form. This is typical in birds, reptiles, and terrestrial insects.

3. **Focus on Semi-Solid Excretion**:
- The question specifically asks about the excretion of nitrogenous waste in a semi-solid form. Uricotelic organisms excrete uric acid, which is often in a paste-like or semi-solid form, allowing them to conserve water.

4. **Conclusion**:
- Based on the analysis, the correct answer to the question is **uricotelic animals** (option D), as they excrete nitrogenous waste in a semi-solid form.

### Final Answer:
The excretion of nitrogenous waste in semi-solid form is found in **uricotelic animals**.

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