If a cell is placed in an isotonic solution, what will occur?

Options

A. Salts will move into the cell from the surrounding solution
B. Water will move into the cell from the surrounding solution
C. Salts will move out of the cell into the surrounding solution
D. None of the above will occur

Answer

### Step-by-Step Solution:

1. **Understanding Isotonic Solutions**:
- An isotonic solution is one where the concentration of solutes outside the cell is equal to the concentration of solutes inside the cell. This means that there is no net movement of water into or out of the cell.

2. **Movement of Water**:
- In an isotonic environment, water molecules move in and out of the cell at equal rates. This means that while individual water molecules may enter or exit the cell, the overall concentration of water remains constant.

3. **Effect on Animal Cells**:
- For animal cells, being in an isotonic solution means that the cells maintain their normal shape and function. They do not swell or shrink, as there is no net movement of water.

4. **Effect on Plant Cells**:
- In plant cells, being in an isotonic solution leads to a condition known as flaccidity. The cells do not become turgid (swollen) because there is no excess water entering the cell, but they also do not lose water and shrivel.

5. **Conclusion**:
- Therefore, if a cell is placed in an isotonic solution, there will be no significant changes to the cell. The correct answer to the question is that none of the above will occur.