Wall - less Gram `o+` bacteria are called :–

Options

A. Protoplast
B. Spheroplast
C. Bacterioplast
D. Myco plasma

Answer

To solve the question "Wall-less Gram `o+` bacteria are called:", we will analyze the options provided and identify the correct term for wall-less Gram-positive bacteria.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify the term used for wall-less Gram-positive bacteria. Gram-positive bacteria typically have a thick peptidoglycan layer in their cell wall.

2. **Analyzing the Options**:
- **Option 1: Protoplast**
- Protoplasts are bacterial cells that have had their cell wall removed. This means they are wall-less and can be derived from Gram-positive bacteria.
- **Conclusion**: This option is correct.

- **Option 2: Spheroplast**
- Spheroplasts are cells that still have part of their cell wall intact but have lost some of it. They are typically associated with Gram-negative bacteria.
- **Conclusion**: This option is incorrect.

- **Option 3: Bacterioplast**
- This term is not commonly used in microbiology and does not refer to any specific type of bacteria.
- **Conclusion**: This option is incorrect.

- **Option 4: Mycoplasma**
- Mycoplasma are a type of bacteria that lack a cell wall, but they are typically classified as Gram-negative.
- **Conclusion**: This option is incorrect.

3. **Final Answer**:
- Based on the analysis, the correct answer is **Protoplast**.