Mark the odd one out ( w.r.t. semi- permeable membrane)

Options

A. Tonoplast
B. Parchment membrane
C. Collodion membrane
D. Copper ferricynide membrane

Answer

To solve the question of marking the odd one out with respect to semi-permeable membranes, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Semi-Permeable Membranes**:
- A semi-permeable membrane allows certain substances to pass through while restricting others. This is crucial for cellular processes such as osmosis and diffusion.

2. **Analyzing the Options**:
- **Option 1: Tonoplast**:
- The tonoplast is the membrane surrounding the vacuole in plant cells. It is semi-permeable, allowing the movement of water and small solutes in and out of the vacuole.
- **Conclusion**: This is a semi-permeable membrane.

- **Option 2: Parchment Membrane**:
- Parchment membrane is also a type of semi-permeable membrane. It allows certain ions and small molecules to diffuse through it.
- **Conclusion**: This is a semi-permeable membrane.

- **Option 3: Copper Ferrocyanide**:
- Copper ferrocyanide is an artificial membrane that has larger pores (50 to 400 micrometers) and allows the passage of non-colloidal substances. While it is classified as a semi-permeable membrane, its characteristics differ from typical biological semi-permeable membranes.
- **Conclusion**: This is a semi-permeable membrane.

- **Option 4: Colloidal Membrane**:
- A colloidal membrane is made up of larger molecules and does not allow the passage of smaller substances. It does not function as a semi-permeable membrane because it restricts the movement of substances.
- **Conclusion**: This is NOT a semi-permeable membrane.

3. **Identifying the Odd One Out**:
- Based on the analysis, the only option that does not fit the definition of a semi-permeable membrane is the colloidal membrane (Option 4). Therefore, it is the odd one out.

### Final Answer:
- **The odd one out with respect to semi-permeable membranes is the Colloidal Membrane (Option 4).**

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