Question

Give an example of diffusion across plasma membrane.

Answer 1

Diffusion is the process of movement of molecules from a region of high concentration to a region of lower concentration until an equilibrium is reached.
When concentration of gases such as CO₂ gets high in the cell as compared to the external environment, then CO₂ moves out of the cell by the process of diffusion via plasma membrane. Similarly, O₂ enters the cell by the process of diffusion when its concentration is reduced in the cell.