Question

question 11
1 pts
which of the following best describes the process of diffusion?

• diffusion is the movement of molecules from an area of lower concentration to one of higher concentration caused by an input of energy to the system.
• diffusion is the movement of molecules from an area of lower concentration to one of higher concentration by random molecular motion.
• diffusion is the movement of molecules from an area of higher concentration to one of lower concentration caused by an input of energy to the system.
• diffusion is the movement of molecules from an area of higher concentration to one of lower concentration by random molecular motion.

Explanation:

To determine the correct description of diffusion, recall the definition: diffusion is the passive (no energy input) movement of molecules from an area of higher concentration to lower concentration due to random molecular motion (Brownian motion).

• The first option is incorrect as diffusion does not move from lower to higher concentration with energy input (that's active transport).
• The second option is incorrect because diffusion moves from higher to lower concentration, not lower to higher.
• The third option is incorrect as diffusion does not require energy input.
• The fourth option correctly states diffusion is movement from higher to lower concentration by random molecular motion.

Answer:

D. Diffusion is the movement of molecules from an area of higher concentration to one of lower concentration by random molecular motion. (Note: Assuming the options are labeled A, B, C, D in order, the fourth option is D.)