Question

the scent of perfume spreading across a room is an example of... *
a) osmosis
b) diffusion
c) active transport
d) endocytosis

Explanation:

• Option A (Osmosis): Osmosis is the movement of water across a semi - permeable membrane from an area of low solute concentration to high solute concentration. Perfume spreading in a room is not related to water movement across a membrane, so A is incorrect.
• Option B (Diffusion): Diffusion is the movement of particles from an area of high concentration to an area of low concentration. Perfume particles (molecules) spread from where the perfume is applied (high concentration) to the rest of the room (low concentration) through the air, which is a classic example of diffusion.
• Option C (Active Transport): Active transport requires energy (ATP) to move substances against their concentration gradient (from low to high concentration). Perfume spreading does not involve energy - consuming transport against a gradient, so C is incorrect.
• Option D (Endocytosis): Endocytosis is a process by which cells take in substances by engulfing them. It is a cellular process and has nothing to do with perfume spreading in a room, so D is incorrect.

Answer:

B) Diffusion