Question

Diffusion of ions and small molecules across cell membranes by plants requires energy

Answer 1

Diffusion of ions and small molecules across cell membrane by plants which requires energy is called Active transport. It requires energy in the form of ATP .

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Answer 2

Molecules and ions move spontaneously down their concentration gradient (i.e., from a region of higher to a region of lower concentration) by diffusion. Molecules and ions can be moved against their concentration gradient, but this process, called active transport, requires the expenditure of energy (usually from ATP).