Question

of the following conditions, which is absolutely necessary for diffusion to take place?
a) a differentially permeable membrane
b) low temperatures
c) a concentration difference
d) a non - permeable membrane
e) a living cell

Explanation:

Diffusion is the movement of a substance from an area of high - concentration to an area of low - concentration. A concentration difference (concentration gradient) is the driving force for diffusion. A differentially permeable membrane is needed for facilitated diffusion or osmosis but not for simple diffusion. Low temperatures slow down diffusion but are not necessary for it to occur. A non - permeable membrane would prevent diffusion. A living cell is not a requirement for diffusion as it can occur in non - living systems too.

Answer:

C. a concentration difference