WAEC Biology 2006 Question 9

Question 9

Cell and Its Environment

During the process of osmosis a semi-permeable membrane allows

  1. A.only solute molecules to pass through it
  2. B.both solute and solvent molecules to pass through it
  3. C.only solvent molecules to pass through it
  4. D.only gaseous molecules to pass through it
Show the answer and explanation

Answer: C (only solvent molecules to pass through it)

Explanation

A semi-permeable membrane lets small solvent (water) molecules through but holds back the larger solute molecules.