Which of the following are found in extreme saline conditions

Options

A. Archaebacteria
B. Eubacteria
C. Cyanobacteria
D. Mycobacteria

Answer

To determine which organisms are found in extreme saline conditions, we can analyze the options provided:

1. **Understanding the term "extreme saline conditions":**
- Extreme saline conditions refer to environments with very high salt concentrations, such as salt lakes or salt flats.

2. **Analyzing the options:**
- **Archaebacteria:** This group includes organisms that can thrive in extreme environments. Specifically, halophiles are a type of archaebacteria that are adapted to live in high-salt environments.
- **Eubacteria:** This is a broader category of bacteria that includes many common bacteria. They are not specifically adapted to extreme saline conditions.
- **Cyanobacteria:** Also known as blue-green algae, these organisms are primarily found in freshwater and terrestrial ecosystems and are not specifically adapted to high salinity.
- **Mycobacteria:** This group includes bacteria that are known for causing diseases in humans and animals, and they are not adapted to extreme saline conditions.

3. **Conclusion:**
- The correct answer is **Archaebacteria**, specifically the halophiles, which are known to thrive in extreme saline conditions.

### Step-by-Step Solution:
1. Define extreme saline conditions.
2. Evaluate each option based on their environmental adaptations.
3. Identify that archaebacteria, particularly halophiles, are adapted to extreme saline conditions.
4. Conclude that the correct answer is archaebacteria.