2026 · Q107
In which of the following processes, active transport is NOT used?
General KnowledgeBiology
- AReabsorption of amino acids and glucose from kidney into blood
- BLoading sugar from photosynthesizing leaf cells into phloem tissue for transportation
- CPassage of Na+ and Cl- through hydrophilic channel created by protein molecules
- DAbsorption of glucose and electrolytes into the bloodstream
Explanation
The passage of Na+ and Cl- through hydrophilic protein channels is facilitated diffusion, a passive process that does not use metabolic energy. In contrast, reabsorption of glucose and amino acids in the kidney, loading of sugar into phloem, and intestinal absorption of glucose and electrolytes all require active transport. The answer is (C).