The bacteria that grow best at the temperature ranging from `45^@" to "65^@C` are called

Options

A. psychrophils
B. mesophiles
C. thermophiles
D. halophiles

Answer

To answer the question regarding the type of bacteria that thrive at temperatures ranging from 45°C to 65°C, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Temperature Ranges**:
- We need to identify the temperature range given in the question, which is from 45°C to 65°C. This indicates that we are looking for bacteria that prefer higher temperatures.

2. **Identifying Types of Bacteria**:
- There are different classifications of bacteria based on their temperature preferences:
- **Psychrophiles**: These bacteria thrive at low temperatures, typically between -20°C to +10°C.
- **Mesophiles**: These bacteria prefer moderate temperatures, generally between 20°C to 45°C.
- **Thermophiles**: These bacteria grow best at higher temperatures, usually above 45°C and can survive temperatures up to around 122°C.
- **Halophiles**: These are not temperature-dependent; instead, they thrive in high salt concentrations.

3. **Analyzing the Options**:
- Based on the definitions:
- **Psychrophiles** are not suitable as they prefer cold temperatures.
- **Mesophiles** are also not suitable as they thrive in moderate temperatures up to 45°C.
- **Thermophiles** are the correct choice since they thrive at temperatures above 45°C, fitting the range of 45°C to 65°C.
- **Halophiles** are irrelevant to temperature preferences.

4. **Conclusion**:
- The bacteria that grow best at temperatures ranging from 45°C to 65°C are classified as **Thermophiles**. Therefore, the correct answer is **Thermophiles**.

### Final Answer:
The bacteria that grow best at the temperature ranging from 45°C to 65°C are called **Thermophiles**.

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