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Question

Osmosis is the term used to refer specifically to the diffusion of water across a differentially or semipermeable membrane (SPM). Which is not correct about it?
  1. Osmosis is the movement of solvent from their higher conc. of water to lower conc. through SPM
  2. Osmosis is the movement of solution from their lower conc. to higher conc. through SPM 
  3. Osmosis is the movement of solvent from higher ψw to lower ψw through SPM
  4. Osmosis is the movement of solvent from high solute potential to low solute potential through SPM


Solution

The correct option is B Osmosis is the movement of solution from their lower conc. to higher conc. through SPM 
Osmosis occurs spontaneously in response to a driving force. The net direction and rate of osmosis depends on both the pressure gradient and concentration gradient. In osmosis, only movement of solvent i.e., water occurs from higher concentration of water (i.e., higher ψw) to lower concentration (i.e., lower ψw). This also means that water moves from low concentration of solute (i.e., high solute potential) to high solute concentration (i.e., low solute potential). So option a, b and d are correct. b is incorrect. 

 

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