Xenopus excretes
(a) Uric acid
(b) Urea
(c) Ammonia
(d) Creatinine

Options

A. Uric acid
B. Urea
C. Ammonia
D. Creatinine

Answer

To determine the type of nitrogenous waste excreted by Xenopus, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: Recognize that Xenopus is a genus that includes frogs, which are amphibians.

2. **Understand the Habitat**: Note that Xenopus species are primarily aquatic, meaning they live in water bodies such as rivers, lakes, and swamps.

3. **Determine Nitrogenous Waste Types**: Understand the types of nitrogenous wastes that organisms can excrete:
- **Uric Acid**: Typically excreted by terrestrial organisms to conserve water.
- **Urea**: Excreted by many mammals and amphibians, less toxic than ammonia but requires some water for excretion.
- **Ammonia**: Highly toxic and requires a large amount of water for excretion; typically excreted by aquatic organisms.
- **Creatinine**: A waste product from muscle metabolism, not a primary nitrogenous waste.

4. **Link Habitat to Waste Type**: Since Xenopus is aquatic, it can afford to excrete ammonia, which is highly toxic but soluble in water. This allows them to effectively eliminate ammonia without the need for water conservation.

5. **Conclusion**: Based on the above points, the correct answer is that Xenopus excretes ammonia.

### Final Answer:
Xenopus excretes **(c) Ammonia**.

---