The presence of a thick cell wall is one of the important factors that differentiate plant cells from animal cells. The cell wall surrounds the cell or plasma membrane. The presence of cell wall allows plant cells to

Options

A. exhibit mobility
B. synthesize their own food
C. separate internal contents of the cell
D. withstand changes in their surroundings

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question is about the role of the thick cell wall in plant cells and how it differentiates them from animal cells.

2. **Identifying the Key Feature**: The thick cell wall is a significant structural feature of plant cells, which is not present in animal cells. This is the primary factor that differentiates the two types of cells.

3. **Function of the Cell Wall**: The cell wall surrounds the plasma membrane and provides structural support and protection to the plant cell. It is crucial for maintaining the shape of the cell.

4. **Evaluating the Options**:
- **Option 1: Exhibit mobility** - This is incorrect. Mobility in cells is typically facilitated by structures like flagella and cilia, which are not related to the cell wall.
- **Option 2: Synthesize the wrong food** - This is also incorrect. Plants synthesize their own food through photosynthesis, so this option does not apply.
- **Option 3: Separate internal contents of the cell** - This option is incorrect as well. While the cell wall provides structure, it does not separate the internal contents; that is the role of the plasma membrane.
- **Option 4: Withstand changes in their surroundings** - This is the correct answer. The cell wall provides protection and helps the plant cells to withstand various environmental changes, such as pressure and temperature fluctuations.

5. **Conclusion**: The presence of a thick cell wall allows plant cells to withstand changes in their surroundings, making option 4 the correct choice.