Active transport in plants works against a concentration gradient and this allows for substances to pass through plant cells without an energy input.

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Active transport in plants requires an input of energy (usually from ATP) and works to transport substances against their concentration gradient, from an area of low concentration to an area of high concentration. This allows plants to selectively accumulate certain ions and nutrients, such as potassium and nitrate, in their cells.

Active Transport in Plants Works Against a Concentration Gradient and This