Komal, a biology student of class X observed that the smell of freshly cut grass in her garden spread rapidly in the air around it. This phenomenon is an…

diffusion

Reason — Diffusion is the movement of molecules from a region of their higher concentration to a region of their lower concentration. The scent molecules of the freshly cut grass move from the region where they are concentrated into the surrounding air, just as the fragrance of a lighted incense stick spreads through a room.