Uric acid is the main excretory product in `:-`

Options

A. Insects
B. Earthworm
C. Amphibians
D. Mammals

Answer

To determine which organism primarily excretes uric acid, we can analyze the options provided: insects, earthworms, amphibians, and mammals.

### Step-by-Step Solution:

1. **Understanding Nitrogenous Waste**:
- Organisms excrete nitrogenous waste in different forms: ammonia, urea, and uric acid.
- The type of nitrogenous waste excreted is often related to the organism's habitat and evolutionary adaptations.

2. **Analyzing Each Option**:
- **Insects**: Insects primarily excrete uric acid as their main nitrogenous waste. This adaptation helps conserve water, which is crucial for survival in terrestrial environments.
- **Earthworms**: Earthworms mainly excrete urea, although they can also excrete small amounts of ammonia. Thus, urea is the predominant nitrogenous waste in earthworms.
- **Amphibians**: Terrestrial amphibians primarily excrete urea. While they may excrete ammonia in their larval stages (like tadpoles), adults predominantly use urea.
- **Mammals**: Mammals also primarily excrete urea as their main nitrogenous waste product.

3. **Conclusion**:
- Based on the analysis, the organism that primarily excretes uric acid is **insects**. Therefore, the correct answer to the question is **insects**.

### Final Answer:
Uric acid is the main excretory product in **insects**.