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The movement of a substance against a diffusion gradient with the use

June 1, 2025 by rawan239

The movement of a substance against a diffusion gradient with the use of energy is known as

active transport

passive transport

water potential gradient

solute loss

This question was previously asked in

UPSC Geoscientist – 2023

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The movement of a substance against a diffusion gradient with the use of energy is known as active transport.

Transport across biological membranes can be passive or active. Passive transport mechanisms (like diffusion and facilitated diffusion) move substances down their concentration or electrochemical gradient and do not require metabolic energy. Active transport moves substances against their gradient, requiring the cell to expend energy, usually in the form of ATP.

Diffusion is the movement of substances from an area of high concentration to an area of low concentration. A diffusion gradient exists when there is a difference in concentration of a substance between two areas. Moving a substance from a low concentration area to a high concentration area, or against the natural flow of diffusion, requires work, which is powered by energy. This is the defining characteristic of active transport.

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