In plant cell which ones are important determinants of movement of molecules in or out of the cell -

Options

A. Cell wall + cell membrane
B. Cell wall + Tonoplasts
C. Tonoplast + Vacuolar membrane
D. Tonoplast + cell membrane

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of Plant Cells**:
- Plant cells have a unique structure that includes a cell wall, cell membrane, and vacuoles. Each of these components plays a role in the movement of molecules.

2. **Cell Wall**:
- The cell wall is primarily composed of cellulose and is permeable. This means that it allows the movement of solutes and solvents. However, it does not act as a barrier to the movement of molecules in and out of the cell.

3. **Cell Membrane**:
- The cell membrane, also known as the plasma membrane, is selectively permeable. This means it regulates the entry and exit of specific molecules, allowing only certain substances to pass through while blocking others. This is a critical determinant of molecular movement in plant cells.

4. **Tonoplast**:
- The tonoplast is the membrane surrounding the vacuole in plant cells. It plays a significant role in maintaining osmotic pressure within the cell and also regulates the movement of molecules in and out of the vacuole.

5. **Conclusion**:
- The important determinants of the movement of molecules in or out of plant cells are the **cell membrane** and the **tonoplast**. These structures work together to control the internal environment of the cell and maintain homeostasis.

### Final Answer:
The important determinants of movement of molecules in or out of the plant cell are the **cell membrane** and the **tonoplast**.

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