Which of the following organelle is non- membrane bound ?

Options

A. Golgi complex
B. Endoplasmic reticulum
C. Ribosome
D. Mitochondrion

Answer

To solve the question "Which of the following organelle is non-membrane bound?" we will analyze each of the given options to determine whether they are membrane-bound or not.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks us to identify which organelle does not have a membrane surrounding it. Membrane-bound organelles have a lipid bilayer that encloses them.

2. **List the Options**: The options provided are:
- A) Golgi complex
- B) Endoplasmic reticulum
- C) Ribosome
- D) Mitochondrion

3. **Analyze Each Option**:
- **A) Golgi complex**: The Golgi complex is composed of flattened membrane-bound sacs called cisternae. Therefore, it is a membrane-bound organelle.

- **B) Endoplasmic reticulum**: The endoplasmic reticulum (ER) consists of a network of membranes. There are two types: Rough ER (with ribosomes on its surface) and Smooth ER (without ribosomes). Both types are membrane-bound organelles.

- **C) Ribosome**: Ribosomes are made up of ribosomal RNA and proteins and do not have a surrounding membrane. They exist as two subunits (70S and 80S) and are not enclosed by any membrane, making them non-membrane bound.

- **D) Mitochondrion**: Mitochondria have two membranes: an outer membrane and an inner membrane that folds into structures called cristae. Thus, they are membrane-bound organelles.

4. **Identify the Correct Answer**: Based on the analysis, the only organelle that is non-membrane bound is the ribosome. Therefore, the correct answer is:
- **C) Ribosome**

### Final Answer:
The organelle that is non-membrane bound is **Ribosome (Option C)**.