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Passive absorption of mineral salts is not dependent on

1. Diffusion
2. Osmosis
3. Donnan equilibrium
4. Ionic exchange

Correct answer: Donnan equilibrium

Solution

Passive absorption of mineral salts occurs by diffusion, osmosis-related water movement, and ionic exchange across membranes. Donnan equilibrium is a distribution phenomenon, not a direct mechanism on which passive mineral salt absorption depends.

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