Choose the animals which are not ureotelic ?

Options

A. Tadpole
B. Crab
C. Labeo
D. All of these

Answer

To solve the question "Choose the animals which are not ureotelic," we need to understand the classification of animals based on their nitrogenous waste excretion methods. Here’s a step-by-step solution:

### Step 1: Understand Ureotelism
- Ureotelic animals excrete nitrogenous waste primarily in the form of urea. This process is known as ureotelism. Urea is less toxic than ammonia and requires a moderate amount of water for excretion.

### Step 2: Identify Ureotelic Animals
- Common examples of ureotelic animals include:
- Terrestrial amphibians (like toads and frogs)
- Mammals
- Some marine fishes

### Step 3: Understand Other Types of Nitrogenous Waste Excretion
- **Ammonotelic Animals**: These animals excrete ammonia directly as their nitrogenous waste. This is typical for aquatic animals because ammonia is highly toxic and requires a large amount of water to be safely excreted. Examples include:
- Crabs
- Fish
- Aquatic larvae of amphibians

- **Uricotelic Animals**: These animals excrete nitrogenous waste primarily in the form of uric acid, which is less toxic and conserves water. Examples include:
- Birds
- Reptiles (like lizards and snakes)
- Insects

### Step 4: Analyze the Options
- The options given are:
- Tanpul
- Crab
- Labio
- All of these

### Step 5: Determine Which Animals are Not Ureotelic
- From our understanding:
- **Crab**: Ammonotelic (not ureotelic)
- **Tanpul**: This term is unclear, but if it refers to a type of animal that is not commonly known, we need additional context.
- **Labio**: This term is also unclear, but if it refers to a specific animal, we need to know its excretion method.

### Conclusion
- Based on the information provided, we can confidently say that **Crab** is not ureotelic. Without clear definitions for Tanpul and Labio, we cannot definitively categorize them without further context. However, if both are not ureotelic, then the answer would be **All of these**.

### Final Answer
- The animals which are not ureotelic include **Crab** and potentially **Tanpul** and **Labio**, depending on their definitions.