Which of the following maintains continuity between the water and lipid phases inside and outside the cells?

Options

A. Cell wall
B. Lecithin
C. Cell vacuole
D. Cell membrane of woody plants

Answer

To solve the question, "Which of the following maintains continuity between the water and lipid phases inside and outside the cells?" we need to analyze the given options:

1. **Cell Wall**
2. **Lecithin**
3. **Cell Vacuole**
4. **Cell Membrane**

### Step-by-Step Solution:

**Step 1: Understand the Function of Each Option**
- **Cell Wall**: This is a rigid structure found in plant cells, fungi, and some bacteria. It provides support and protection but does not play a direct role in maintaining continuity between water and lipid phases.

- **Lecithin**: Lecithin is a type of phospholipid that is important in cell membranes. It has both hydrophilic (water-attracting) and hydrophobic (water-repelling) properties, which allows it to interact with both water and lipid phases.

- **Cell Vacuole**: Vacuoles are storage organelles in cells, primarily involved in storing substances and maintaining turgor pressure in plant cells. They do not maintain continuity between water and lipid phases.

- **Cell Membrane**: The cell membrane, also known as the plasma membrane, is composed of a phospholipid bilayer that separates the interior of the cell from the external environment. It plays a crucial role in maintaining the balance between water and lipid phases.

**Step 2: Identify the Correct Answer**
From the analysis, the cell membrane is the structure that maintains continuity between the water and lipid phases inside and outside the cell. Lecithin, being a component of the cell membrane, also contributes to this function.

**Conclusion**: The correct answer is **Lecithin**.