Earthworm is

Options

A. ammonotelic
B. ureotelic
C. uricotelic
D. both (1) & (2)

Answer

To determine the classification of earthworms based on their excretory products, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification of Excretory Products**:
- Organisms can be classified based on the type of nitrogenous waste they excrete:
- **Ammonotelic**: Excrete ammonia (e.g., many aquatic organisms).
- **Ureotelic**: Excrete urea (e.g., mammals, amphibians, and earthworms).
- **Uricotelic**: Excrete uric acid (e.g., birds, reptiles, and insects).

2. **Identify the Excretory Product of Earthworms**:
- Earthworms primarily excrete urea as their nitrogenous waste.
- They also excrete a smaller amount of ammonia, but the majority is urea.

3. **Determine the Correct Classification**:
- Since earthworms excrete a significant amount of urea (40% of their excretory products), they fall under the category of ureotelic organisms.

4. **Select the Correct Option**:
- Given the options:
- Option 1: Ammonotelic
- Option 2: Ureotelic
- Option 3: Uricotelic
- Option 4: Both 1st and 2nd
- The correct answer is **Option 2: Ureotelic**.

### Final Answer:
Earthworm is a **ureotelic** organism.

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