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Question

In which of the following processes, active transport is NOT used?

This question was previously asked in
CDS 2 2026 GK Question Paper (13-Sep-2026)
The correct answer is

Passage of Na+ and Cl- through hydrophilic channel created by protein molecules

Movement of ions such as Na+ and Cl- through hydrophilic channels formed by membrane proteins is facilitated diffusion, a passive transport process that moves ions down their concentration gradient without using ATP. In contrast, kidney reabsorption of glucose/amino acids, phloem loading of sugar, and intestinal absorption of glucose and electrolytes are all energy-dependent active co-transport mechanisms. Hence, active transport is NOT used in the ion-channel process described in option (c).

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