Which of the following has urea acid as the chief nitrogenous waste`

Options

A. Frog
B. Man
C. Earthworm
D. Cockroach

Answer

To determine which of the following has urea as the chief nitrogenous waste, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Nitrogenous Wastes**:
- Nitrogenous wastes are the byproducts of protein metabolism. The three main types of nitrogenous wastes are ammonia, urea, and uric acid.
- Animals can be classified based on the type of nitrogenous waste they excrete:
- **Ammoniotelic**: Excrete ammonia (e.g., aquatic animals).
- **Ureotelic**: Excrete urea (e.g., mammals, amphibians).
- **Uricotelic**: Excrete uric acid (e.g., birds, reptiles, and insects).

2. **Evaluate the Options**:
- **Option 1: Frog**: Frogs are amphibians and primarily excrete urea. They are considered ureotelic.
- **Option 2: Man**: Humans also excrete urea as their main nitrogenous waste, making them ureotelic as well.
- **Option 3: Earthworm**: Earthworms excrete a mixture of nitrogenous wastes, including urea, ammonia, and amino acids, but do not primarily excrete urea.
- **Option 4: Cockroach**: Cockroaches excrete uric acid to conserve water, making them uricotelic.

3. **Identify the Correct Answers**:
- Based on the evaluation, both the frog and man excrete urea as their chief nitrogenous waste. Therefore, both options 1 (Frog) and 2 (Man) are correct.

### Conclusion:
The animals that primarily excrete urea as their chief nitrogenous waste are:
- Frog (Option 1)
- Man (Option 2)