Question

What is the difference between osmosis and diffusion?
Question 2 options:

Diffusion uses energy, but osmosis does not.

Osmosis is movement of proteins, and diffusion is movement of water.

Osmosis is a kind of diffusion that involves movement of water.

Diffusion only occurs in animal cells, and osmosis only occurs in plant cells.

Answer 1

The correct answer is:

**Osmosis is a kind of diffusion that involves movement of water.**

### Explanation:
- **Diffusion** is the process by which molecules move from an area of higher concentration to an area of lower concentration, resulting in a net movement of particles until they are evenly distributed.
- **Osmosis** is a specific type of diffusion that specifically refers to the movement of water molecules through a selectively permeable membrane, from an area of lower solute concentration to an area of higher solute concentration.

The other options are incorrect for the following reasons:
- **Diffusion uses energy, but osmosis does not:** Both diffusion and osmosis are passive processes and do not require energy.
- **Osmosis is movement of proteins, and diffusion is movement of water:** This is incorrect; osmosis specifically refers to water movement.
- **Diffusion only occurs in animal cells, and osmosis only occurs in plant cells:** Both diffusion and osmosis occur in various cell types, including both plant and animal cells.