Osmosis is a specific form of -

Options

A. Active transport
B. Secondary active transport
C. Faciliated diffusion
D. Diffusion

Answer

**Step-by-Step Text Solution:**

1. **Understanding Osmosis**: Osmosis is defined as the movement of water molecules through 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. **Type of Transport**: Osmosis is a specific type of diffusion. While diffusion can refer to the movement of any substance, osmosis specifically refers to the movement of water.

3. **Passive Transport**: Osmosis is classified as a passive transport mechanism. This means that it does not require energy input from the cell; instead, it relies on the concentration gradient of water.

4. **Equilibrium**: The process of osmosis continues until equilibrium is reached, meaning that the concentration of water is equal on both sides of the semi-permeable membrane.

5. **Evaluating Options**:
- Active transport requires energy and is not applicable to osmosis.
- Secondary active transport also involves energy but is not relevant to osmosis.
- Facilitated diffusion involves membrane proteins and is not the same as osmosis.
- Therefore, osmosis is correctly identified as a specific form of diffusion.

**Final Answer**: Osmosis is a specific form of diffusion.

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