Which of the following is an energy dependent process ?

Options

A. Facilitated diffusion
B. Active transport
C. Endosmosis
D. Exosmosis

Explanation

To determine which of the following processes is energy dependent, we will analyze each option provided: Facilitated Diffusion, Active Transport, Endosmosis, and Exosmosis.

### Step-by-Step Solution:

1. **Understanding Facilitated Diffusion**:
- Facilitated diffusion is a process where molecules move across a cell membrane through a protein channel or carrier protein.
- This movement occurs from an area of higher concentration to an area of lower concentration.
- **Key Point**: This process does not require energy (ATP) because it relies on the concentration gradient.

2. **Understanding Active Transport**:
- Active transport is a process that moves molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.
- This process requires energy in the form of ATP because it is moving substances against the natural flow.
- **Key Point**: Active transport is indeed an energy-dependent process.

3. **Understanding Endosmosis**:
- Endosmosis refers to the movement of water into a cell through a selectively permeable membrane.
- This movement typically occurs from an area of higher water concentration (or lower solute concentration) to an area of lower water concentration (or higher solute concentration).
- **Key Point**: Endosmosis does not require energy as it follows the concentration gradient.

4. **Understanding Exosmosis**:
- Exosmosis is the process of water moving out of a cell through a selectively permeable membrane.
- Similar to endosmosis, this movement occurs from an area of higher water concentration to an area of lower water concentration.
- **Key Point**: Exosmosis also does not require energy as it follows the concentration gradient.

### Conclusion:
After analyzing all the options, the only energy-dependent process among the given choices is **Active Transport**.

### Final Answer:
**Active Transport** is the energy-dependent process.

---