Movement of water through the plasma membrane by diffusion is called

Options

A. Plasmolysis
B. Exosmosis
C. Endosmosis
D. Osmosis

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks about the movement of water through the plasma membrane by diffusion. We need to identify the correct term that describes this process.

2. **Defining the Options:**
- **Plasma Lysis:** This term refers to the shrinkage of a cell due to the loss of water when placed in a hypertonic solution. Since this process only involves the movement of water out of the cell, it cannot be the correct answer.

- **Exosmosis:** This term describes the process of substances being secreted out of the cell. It does not involve the intake of water or any other substance, so it is not the correct answer.

- **Endosmosis:** This term refers to the intake of substances into the cell. While it involves the movement of water into the cell, it does not account for the movement of water out of the cell. Therefore, it cannot be the correct answer either.

- **Osmosis:** This is the movement of water across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration. This process accounts for both the movement of water into and out of the cell, making it the most appropriate term for the question.

3. **Conclusion:**
After analyzing all the options, we conclude that the correct answer is **osmosis**, as it accurately describes the movement of water through the plasma membrane by diffusion.

**Final Answer: Osmosis**

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