Which of the following is not example of osmosis ?

Options

A. Water passing from root hair to adjacent cells.
B. Water passing up a xylem element to anther element above it.
C. Water entering mesophyll cell from the xylem elements.
D. Water entering the root hair from the soil.

Answer

To solve the question "Which of the following is not an example of osmosis?", we will analyze each option provided and determine whether osmosis is involved.

### Step-by-Step Solution:

1. **Understand Osmosis**:
- Osmosis is defined as the movement of water (or solvent) across a semi-permeable membrane from an area of higher water concentration (or lower solute concentration) to an area of lower water concentration (or higher solute concentration).

2. **Evaluate Each Option**:
- **Option 1**: Water passing from root hair to adjacent cell.
- This involves osmosis because water moves from an area of higher concentration in the root hair to a lower concentration in the adjacent cell.

- **Option 2**: Water passing up xylem element to another element above it.
- This does not involve osmosis. Water movement in the xylem is primarily due to transpiration pull and root pressure, not osmosis. The xylem is non-living tissue, and the movement of water here does not depend on concentration gradients across a semi-permeable membrane.

- **Option 3**: Water entering into the mesophyll cell from the xylem elements.
- This involves osmosis because water moves from the xylem (higher water concentration) into the mesophyll cells (lower water concentration).

- **Option 4**: Water entering the root hair from the soil.
- This is also an example of osmosis, as water moves from the soil (higher concentration) into the root hair (lower concentration).

3. **Identify the Incorrect Option**:
- Based on the evaluations, the only option that does not involve osmosis is **Option 2**: Water passing up xylem element to another element above it.

### Final Answer:
The option that is not an example of osmosis is **Option 2**.

---