Uric acid is nitroggenous waste in

Options

A. Mammals and molluscs
B. Birds and lizards
C. Frog and cartilaginous fishes
D. Insects and bony fishes

Answer

To solve the question "Uric acid is nitrogenous waste in," we can follow these steps:

### Step 1: Understand Nitrogenous Wastes
Nitrogenous wastes are products of protein metabolism that need to be excreted from the body. The main types of nitrogenous wastes include ammonia, urea, and uric acid.

### Step 2: Identify Organisms and Their Excretory Products
Different organisms excrete different types of nitrogenous wastes based on their environment and water availability.

- **Ammonia**: Typically excreted by aquatic organisms like fish, as it is highly soluble in water and can be easily diluted.
- **Urea**: Excreted by mammals and amphibians, which have a moderate water availability.
- **Uric Acid**: Excreted by organisms that need to conserve water, such as birds and reptiles.

### Step 3: Analyze the Options
Now, let's analyze the options given in the question:

1. **Mammals and Mollusks**: These organisms primarily excrete urea, not uric acid.
2. **Frog and Cartilaginous Fishes**: Frogs excrete urea, and cartilaginous fishes like sharks excrete urea as well.
3. **Insects and Bony Fishes**: Insects excrete uric acid, while bony fishes excrete ammonia.

### Step 4: Identify the Correct Answer
From the analysis, we find that uric acid is primarily excreted by birds and reptiles. Therefore, the correct answer to the question "Uric acid is nitrogenous waste in" is:

**Birds and Reptiles** (not explicitly listed in the options, but inferred from the context).

### Final Answer
Uric acid is a nitrogenous waste in birds and reptiles.

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