A type of respiration in Frog in which the external nares remain open

Options

A. Cutaneous
B. Buccopharyngeal
C. Pulmonary
D. All the above

Answer

To solve the question regarding the type of respiration in frogs where the external nares remain open, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Frog Respiration**: Frogs are amphibians that can respire through various methods depending on their life stage and environment. The main types of respiration in frogs include:
- **Cutaneous Respiration**: Respiration through the skin, primarily when the frog is in water.
- **Pulmonary Respiration**: Respiration through the lungs, mainly when the frog is on land.
- **Buccopharyngeal Respiration**: Respiration through the mouth and throat area.

2. **Identify the Role of External Nares**: The external nares (nostrils) are openings located between the eyes and snout of the frog. These openings are crucial for breathing as they allow air to enter and exit the respiratory system.

3. **Analyze the Options**:
- **Cutaneous Respiration**: This method does not involve the external nares as it occurs through the skin.
- **Pulmonary Respiration**: This method involves the lungs and does not necessarily require the external nares to remain open.
- **Buccopharyngeal Respiration**: This method involves the mouth and throat, and during this process, the external nares remain open to facilitate the inhalation and exhalation of air.

4. **Conclusion**: Given that the question specifically asks for the type of respiration in frogs where the external nares remain open, the correct answer is **Buccopharyngeal Respiration**.

### Final Answer:
The type of respiration in frogs in which the external nares remain open is **Buccopharyngeal Respiration**.

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