Which one of the following is NOT needed for the facilitated diffusion in plants?

Facilitated diffusion is a type of passive transport that allows substances to cross cell membranes with the assistance of special transport proteins, such as aquaporins and ion channels.

Since it is a passive process, it occurs along the concentration gradient (from a region of higher concentration to a region of lower concentration).

Because the movement is down the concentration gradient, it does not require any expenditure of metabolic energy (ATP). Therefore, the expenditure of energy is not needed for facilitated diffusion.

Answer: Expenditure of energy