Question

A bottle of perfume is opened in the room opposite to you and within minutes you begin to smell the
perfume. This phenomenon is a classic example of
A . Dialysis
B . Osmosis
C. Active transport
D. Diffusion

Answer 1

Hint: Diffusion is the transport of molecules from its high concentration to low concentration. Dialysis is a medical term related to kidney dysfunction, in which blood is filtered artificially by using a machine in case of kidney failure. Osmosis is the transport of solvent molecules via the semi-permeable membrane in active transport energy is required.

Complete step by step answer:Dialysis is the process where blood is pumped out of the body for filtration in patients with kidney failure.
Osmosis is the movement of water molecules from higher concentration to lower concentration of water. This movement of molecules is through the semipermeable membrane. This membrane is highly selective and allows only solvent molecules to pass through it. Example- Plasma-membrane.
Active transport requires the transport of molecules from a low-concentration region to a high-concentration region which is against the concentration gradient hence, energy is required.
Diffusion is the movement of individual molecules of a substance from an area of higher concentration to an area of lower concentration. When we open the perfume bottle, the concentration of perfume in that bottle is very high so due to the diffusion phenomenon, the molecules travel from higher concentration to lower concentration.
So, the correct answer to the given question is option D. Diffusion.

Note: In some countries like UAE seawater which is not drinkable is used for drinking purposes by using reverse osmosis. In this condition, the pressure is applied against the concentration gradient due to which movement of water molecules takes place which is reverse to osmosis hence, called reverse osmosis.