Which of the following statements best describes diffusion?
A) the net movement of water through a selectively permeable membrane, from a region of greater water concentration to a region of lesser water concentration
B) the net movement of substances from a region of lesser concentration to one of greater concentration
C) the net movement of substances from a region of greater concentration to one of lesser concentration
D) None of the listed responses is correct.

Question

Quizplus · Accepted Answer

Diffusion refers to the net movement of substances from an area of higher concentration to an area of lower concentration, until equilibrium is reached. This process occurs due to the random movement of molecules and does not require an input of energy. Option A describes osmosis, which is a special case of diffusion involving water molecules. Option B, on the other hand, describes active transport, which moves substances against their concentration gradient and requires energy input. Therefore, option C is the best description of diffusion.

Which of the Following Statements Best Describes Diffusion