Name a reptile having four chambered heart.

Options

A. Testudo
B. Crocodilus
C. Chelone
D. Naja

Answer

To answer the question, "Name a reptile having a four-chambered heart," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Heart Structure in Reptiles**: Most reptiles typically have a three-chambered heart, which consists of two atria (auricles) and one ventricle. This structure can lead to the mixing of oxygenated and deoxygenated blood.

2. **Identify Exceptions**: While the majority of reptiles have a three-chambered heart, there are exceptions within the reptile class that possess a four-chambered heart, which includes two atria and two ventricles. This allows for better separation of oxygenated and deoxygenated blood.

3. **Review the Options**: The options provided are:
- A. Testudo (Tortoise)
- B. Crocodilus (Crocodile)
- C. Chelon (Turtle)
- D. Naja (Cobra)

4. **Analyze Each Option**:
- **Testudo (Tortoise)**: Known to have a three-chambered heart.
- **Crocodilus (Crocodile)**: Known to have a four-chambered heart.
- **Chelon (Turtle)**: Also has a three-chambered heart.
- **Naja (Cobra)**: Has a three-chambered heart.

5. **Select the Correct Answer**: Based on the analysis, the only reptile among the options that has a four-chambered heart is **B. Crocodilus (Crocodile)**.

### Final Answer:
The reptile having a four-chambered heart is **Crocodile (Crocodilus)**.

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