Which of the following is not uricotelic?

Options

A. Cockroach
B. Pigeon
C. Sparrow
D. Frog

Answer

To determine which of the given options is not uricotelic, we need to understand the concept of uricotelism and the types of nitrogenous waste excretion in animals.

### Step-by-Step Solution:

1. **Understand Uricotelism**:
- Uricotelic animals are those that excrete nitrogenous waste primarily in the form of uric acid. This adaptation is common in animals that need to conserve water, as uric acid is less toxic and requires less water for excretion compared to urea or ammonia.

2. **Identify Uricotelic Animals**:
- Common examples of uricotelic animals include birds (like pigeons and sparrows) and reptiles (like lizards and snakes).
- Insects, such as cockroaches, also excrete uric acid and are therefore classified as uricotelic.

3. **Examine the Options**:
- Let's analyze the options provided:
- **Cockroach**: Excretes uric acid (uricotelic).
- **Pigeon**: Excretes uric acid (uricotelic).
- **Sparrow**: Excretes uric acid (uricotelic).
- **Frog**: Excretes urea (ureotelic).

4. **Identify the Non-Uricotelic Option**:
- From the analysis, the frog is the only animal listed that does not excrete uric acid. Instead, it excretes urea, which classifies it as ureotelic.

5. **Conclusion**:
- Therefore, the correct answer to the question "Which of the following is not uricotelic?" is the **frog**.

### Final Answer:
**Frog** is not uricotelic.

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