Uric acid is nitrogenous waste in

Options

A. mammals and molluscs
B. birds and lizards
C. frog and cartilaginous fishes
D. insscts and bony fishes

Explanation

### Step-by-Step Solution:

1. **Understanding Nitrogenous Wastes**:
- Nitrogenous wastes are the byproducts of protein metabolism in animals. The three main types of nitrogenous wastes are ammonia, urea, and uric acid.

2. **Identifying Uric Acid**:
- Uric acid is a less toxic form of nitrogenous waste that is excreted by certain animals. It is primarily produced by organisms that conserve water, as uric acid is less soluble in water compared to ammonia and urea.

3. **Animals Excreting Uric Acid**:
- Uric acid is typically excreted by:
- Birds
- Reptiles (including lizards)
- Insects
- Some terrestrial snails (mollusks)

4. **Exclusion of Other Options**:
- Mammals primarily excrete urea.
- Amphibians and most fish excrete ammonia due to their aquatic environments, which allow for the dilution of this toxic waste.
- Cartilaginous fishes also excrete urea, not uric acid.

5. **Conclusion**:
- Based on the above information, the correct answer to the question "Uric acid is nitrogenous waste in" is **birds and lizards**.