which one is without an external covering ?

Options

A. Lysosome
B. Gogli apparatus
C. Centrosome
D. Centrioles

Answer

To answer the question "Which one is without an external covering?" we will analyze the given options step by step.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks us to identify which of the given options is a cell organelle that does not have an external covering or membrane.

2. **Identify the Options**: The options provided are:
- Option 1: Lysosome
- Option 2: Golgi apparatus
- Option 3: Centrosome
- Option 4: Centrioles

3. **Define Membrane-Bound Organelles**: Membrane-bound organelles are those that are surrounded by a plasma membrane, which separates their internal environment from the cytoplasm. Examples include lysosomes, Golgi apparatus, and mitochondria.

4. **Analyze Each Option**:
- **Option 1: Lysosome** - This is a membrane-bound organelle filled with enzymes and surrounded by a membrane. Therefore, it has an external covering.
- **Option 2: Golgi apparatus** - This is also a membrane-bound organelle that processes and packages proteins. It has an external membrane as well.
- **Option 3: Centrosome** - This is a non-membrane bound organelle that consists of two centrioles. It does not have an external covering.
- **Option 4: Centrioles** - These are structures within the centrosome and are also non-membrane bound, but they are part of the centrosome.

5. **Conclusion**: Since the centrosome is identified as a non-membrane bound organelle, the correct answer to the question is **Option 3: Centrosome**.

### Final Answer:
The correct answer is **Centrosome** (Option 3).

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