Archaebacteria can survive better than other bacteria in unfavourable conditions because of their

Options

A. Food
B. Mesosomes
C. Cell wall
D. Plasmids

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks why Archaebacteria can survive better than other bacteria in unfavorable conditions. We need to evaluate the options provided to determine which one correctly explains this ability.

2. **Evaluating the Options:**
- **Option A: Food**
- Food does not play a significant role in the survival of Archaebacteria under unfavorable conditions. Therefore, this option is incorrect.

- **Option B: Mesosomes**
- Mesosomes are invaginations in the cell membrane that assist in respiration and cell division but do not provide protection against harsh environmental conditions. Thus, this option is also incorrect.

- **Option C: Cell Wall**
- The cell wall of Archaebacteria is semi-rigid and provides protection from environmental stresses. It contains a unique proteinaceous S-layer, which can be the only component of the cell wall in some Archaea. This S-layer forms a two-dimensional crystalline array, offering significant protection. Some Archaea also contain pseudomurine, which enhances the strength of the cell wall. This option is correct as the cell wall is crucial for survival in unfavorable conditions.

- **Option D: Plasmids**
- Plasmids are extrachromosomal DNA that do not provide protection against environmental stresses. They are primarily involved in gene transfer between bacteria. Therefore, this option is incorrect.

3. **Conclusion:**
After evaluating all the options, the correct answer is that Archaebacteria can survive better than other bacteria in unfavorable conditions because of their **cell wall**.

**Final Answer:**
Archaebacteria can survive better than other bacteria in unfavorable conditions because of their **cell wall**.

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